2MASS All Sky Release

1. Point Source Catalog (PSC)

a. Column Descriptions

The following table contains brief descriptions of the parameters provided for each source in the 2MASS All Sky Release PSC. The table is organized according to the broad function and utility of the parameters: positional information, photometric information, and source quality information. For PSC flag parameters, the meaning of each possible flag value is given, along with some practical information on their usage.

The columns in the following table are:

Column Name: The parameter name in the PSC table. Click on this to go to the section of the Explanatory Supplement where the derivation and/or usage of that parameter is described in more detail.

Format: The ascii-equivalent format of the field in the PSC, expressed in "C" readable notation. This is useful when parsing the aligned tabular output from IRSA/GATOR. Although the data values will conform to these formats, the actual width of the field in the GATOR output may be padded with extra blank spaces to accommodate column headers. Note that some fields containnull values that will require special handling when parsing PSC tables drawn from either IRSA/GATOR output or the ascii DVD or ftp versions.

Units: The units of the parameter. A value of "---" in this column means that the parameter is dimensionless.

nulls: A "yes" in this column means that this parameter can be null in the PSC. A "no" means that there will always be a value in this column in the PSC. Note that null values are represented differently in the IRSA/GATOR output and the ascii DVD or ftp versions of the PSC.

Description: A brief description of the parameter and its values.

Column Name	Format	Units	nulls	Description
Primary Positional Information
ra	%10.6f	deg	no	J2000 right ascension with respect to the ICRS
dec/decl	%10.6f	deg	no	J2000 declination with respect to the ICRS
err_maj	%4.2f	arcsec	no	Semi-major axis length of the one sigma position uncertainty ellipse
err_min	%4.2f	arcsec	no	Semi-minor axis length of the one sigma position uncertainty ellipse
err_ang	%3d	deg	no	Position angle on the sky of the semi-major axis of the position uncertainty ellipse (East of North)
designation	%17s	---	no	Sexagesimal, equatorial position-based source name in the form: hhmmssss+ddmmsss[ABC...]. The full naming convention for 2MASS All-Sky Release PSC sources has the form "2MASS Jhhmmssss+ddmmsss[ABC...]", where "2MASS" indicates that the source is from the All-Sky PSC, "J" indicates the position is J2000, and the optional trailing letters are used to distinguish sources with otherwise duplicate names. The "2MASS J" prefix is not listed explicitly in the designation column.
Primary Photometric Information
<="" a="">j_m	%6.3f	mag	yes	Default J-band magnitude, or if the source is not detected in the J-band, the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The origin of the default magnitude is given by the first character of the rd_flg value (rd_flg[1]). This column is null if the source is nominally detected in the J-band, but no useful brightness estimate could be made (rd_flg[1]="9").
<="" a="">j_cmsig	%5.3f	mag	yes	Corrected photometric uncertainty for the default J-band magnitude. If rd_flg[1]="2", this is the measurement error from the profile-fitting procedure,corrected to be consistent with observed repeatability statistics. If rd_flg[1]="1" or "4", this is the RMS of the brightness measured in aperture photometry on the individual frames. If rd_flg="3", the uncertainty is derived from the residuals to the 1-d radial profile fit to the unsaturated wings of the bright star. Ifj_cmsig > 8.0, it is a flag value indicating that a meaningful uncertainty could not be determined for the source. This column is null if the default magnitude is a 95% confidence upper limit (rd_flg[1]="0" or "6") or if the source is not measurable (rd_flg[1]="9").
<="" a="">j_msigcom	%5.3f	mag	yes	Combined, or total photometric uncertainty for the default J-band magnitude. The combined uncertainty is derived from the following relation: j_msigcom = sqrt(j_cmsig2 + j_zperr2 + fferr2 + [r1normrms2]) where j_cmsig = Corrected J-band photometric uncertainty j_zperr = Nightly photometric zero point uncertainty = 0.011 mag fferr = Flat-fielding residual error = 0.005 mags r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for sources with rd_flg[1]="1") This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the J-band).
j_snr	%10.1f	mag	yes	J-band "scan" signal-to-noise ratio. This value is given by the ratio of the J-band flux to the characteristic J-band scan noise. The scan noise is the mode of the distribution of flux uncertainties for all point source measurements in a specific 2MASS scan, and is tabulated in the Scan Information Table (NOT YET AVAILABLE). j_snr values are capped at 10000000.0. This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the J-band).
<="" a="">h_m	%6.3f	mag	yes	Default H-band magnitude, or if the source is not detected in the H-band, the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The origin of the default magnitude is given by the second character of the rd_flg value (rd_flg[2]). This column is null if the source is nominally detected in the H-band, but no useful brightness estimate could be made (rd_flg[2]="9").
<="" a="">h_cmsig	%5.3f	mag	yes	Corrected photometric uncertainty for the default H-band magnitude. If rd_flg[2]="2", this is the measurement error from the profile-fitting procedure,corrected to be consistent with observed repeatability statistics. If rd_flg[2]="1" or "4", this is the RMS of the brightness measured in aperture photometry on the individual frames. If rd_flg="3", the uncertainty is derived from the residuals to the 1-d radial profile fit to the unsaturated wings of the bright star. Ifh_cmsig > 8.0, it is a flag value indicating that a meaningful uncertainty could not be determined for the source. This column is null if the default magnitude is a 95% confidence upper limit (rd_flg[2]="0" or "6") or if the source is not measurable (rd_flg[2]="9").
<="" a="">h_msigcom	%5.3f	mag	yes	Combined, or total photometric uncertainty for the default H-band magnitude. The combined uncertainty is derived from the following relation: h_msigcom = sqrt(h_cmsig2 + h_zperr2 + fferr2 + [r1normrms2]) where h_cmsig = Corrected H-band photometric uncertainty h_zperr = Nightly photometric zero point uncertainty = 0.007 mag fferr = Flat-fielding residual error = 0.005 mags r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for sources with rd_flg[2]="1") This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the H-band).
h_snr	%10.1f	mag	yes	H-band "scan" signal-to-noise ratio. This value is given by the ratio of the H-band flux to the characteristic H-band scan noise. The scan noise is the mode of the distribution of flux uncertainties for all point source measurements in a specific 2MASS scan, and is tabulated in the Scan Information Table (NOT YET AVAILABLE). h_snr values are capped at 10000000.0. This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the H-band).
<="" a="">k_m	%6.3f	mag	yes	Default Ks-band magnitude, or if the source is not detected in the Ks-band, the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The origin of the default magnitude is given by the third character of the rd_flg value (rd_flg[3]). This column is null if the source is nominally detected in the Ks-band, but no useful brightness estimate could be made (rd_flg[3]="9").
<="" a="">k_cmsig	%5.3f	mag	yes	Corrected photometric uncertainty for the default Ks-band magnitude. If rd_flg[3]="2", this is the measurement error from the profile-fitting procedure,corrected to be consistent with observed repeatability statistics. If rd_flg[3]="1" or "4", this is the RMS of the brightness measured in aperture photometry on the individual frames. If rd_flg="3", the uncertainty is derived from the residuals to the 1-d radial profile fit to the unsaturated wings of the bright star. Ifk_cmsig > 8.0, it is a flag value indicating that a meaningful uncertainty could not be determined for the source. This column is null if the default magnitude is a 95% confidence upper limit (rd_flg[3]="0" or "6") or if the source is not measurable (rd_flg[3]="9").
<="" a="">k_msigcom	%5.3f	mag	yes	Combined, or total photometric uncertainty for the default Ks-band magnitude. The combined uncertainty is derived from the following relation: k_msigcom = sqrt(k_cmsig2 + k_zperr2 + fferr2 + [r1normrms2]) where k_cmsig = Corrected Ks-band photometric uncertainty k_zperr = Nightly photometric zero point uncertainty = 0.007 mag fferr = Flat-fielding residual error = 0.005 mags r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for sources with rd_flg[3]="1") This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the Ks-band).
k_snr	%10.1f	mag	yes	Ks-band "scan" signal-to-noise ratio. This value is given by the ratio of the Ks-band flux to the characteristic Ks-band scan noise. The scan noise is the mode of the distribution of flux uncertainties for all point source measurements in a specific 2MASS scan, and is tabulated in the Scan Information Table (NOT YET AVAILABLE). k_snr values are capped at 10000000.0. This column is null if the default magnitude is a 95% confidence upper limit (i.e. the source is not detected, or inconsistently deblended in the Ks-band).
Primary Source Quality Information
ph_qual	%3s	---	no	Photometric quality flag. Three character flag, one character per band [JHKs], that provides a summary of the net quality of the default photometry in each band, as derived from the Read Flag (rd_flg), measurement uncertainties ([jhk]_cmsig), scan signal-to-noise ratios ([jhk]_snr), frame-detection statistics (ndet), and profile-fit reduced chi-squared values ([jhk]_psfchi). The value for ph_qual is set for a band according to the precedence of the table below. For example, a source that is tested and meets the conditions for category "X" is not tested for subsequent qualities. "X" - There is a detection at this location, but no valid brightness estimate can be extracted using any algorithm. rd_flg="9" and default magnitude isnull. "U" - Upper limit on magnitude. Source is not detected in this band (rd_flg="0"), or it is detected, but not resolved in a consistent fashion with other bands (rd_flg="6"). A value of ph_qual="U" does not necessarily mean that there is no flux detected in this band at the location. Whether or not flux has been detected can be determined from the value of rd_flg. When rd_flg="0", no flux has been detected. When rd_flg="6", flux has been detected at the location where the images were not deblended consistently in all three bands (JHKs). "F" - This category includes rd_flg="1" or rd_flg="3" sources where a reliable estimate of the photometric error, [jhk]_cmsig, could not be determined. The uncertainties reported for these sources in [jhk]_cmsig and [jhk]_msigcom are flags and have numeric values >8.0. "E" - This category includes detections where the goodness-of-fit quality of the profile-fit photometry was very poor (rd_flg=2 and[jhk]psf_chi>10.0), or detections where psf fit photometry did not converge and an aperture magnitude is reported (rd_flg=4), or detections where the number of frames was too small in relation to the number of frames in which a detection was geometrically possible (rd_flg="1" or rd_flg="2"). "A" - Detections in any brightness regime where valid measurements were made (rd_flg="1","2" or "3") with [jhk]_snr>10 AND [jhk]_cmsig<0.10857. "B" - Detections in any brightness regime where valid measurements were made (rd_flg="1","2" or "3") with [jhk]_snr>7 AND [jhk]_cmsig<0.15510. "C" - Detections in any brightness regime where valid measurements were made (rd_flg="1","2" or "3") with [jhk]_snr>5 AND [jhk]_cmsig<0.21714. "D" - Detections in any brightness regime where valid measurements were made (rd_flg="1","2" or "3") with no [jhk]_snr or [jhk]_cmsigrequirement.
rd_flg	%3s	---	no	Read flag. Three character flag, one character per band [JHKs], that indicates the origin of the default magnitudes and uncertainties in each band (j_m,h_m,k_m, j_cmsig, h_cmsig, k_cmsig). Rd_flg values of "1", "2" or "3" generally indicate the best quality detections, photometry and astrometry (although other quality flags must be considered). Values of "0", "4", "6" and "9" in a band indicate either non-detections, or generally poor quality photometry and positions. The definitions of the rd_flg values are: "0" - Source is not detected in this band. The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". "1" - The default magnitude is derived from aperture photometry measurements on the 51 ms "Read_1" exposures. The aperture radius is 4", with the sky background measured in an annulus with an inner radius of 14" and an outer radius of 20". Used for sources that saturate one or more of the 1.3s "Read_2" exposures, but are not saturated on at least one of the 51 ms "Read_1" frames. "2" - The default magnitude is derived from a profile-fitting measurement made on the 1.3 sec "Read_2" exposures. The profile-fit magnitudes are normalized to curve-of-growth-corrected aperture magnitudes. This is the most common type in the PSC, and is used for sources that have no saturated pixels in any of the 1.3 sec exposures. "3" - The default magnitude is derived from a 1-d radial profile fitting measurement made on the 51 ms "Read_1" exposures. Used for very bright sources that saturate all of the 51 ms "Read 1" exposures. "4" - The default magnitude is derived from curve-of-growth-corrected 4" radius aperture photometry measurements on the 1.3 s "Read_2" exposures. This is used for sources that are not saturated in any of the Read_2 frames, but where the profile-fitting measurements fail to converge to a solution. These magnitudes are the same as the standard aperture magnitudes (j_m_stdap, h_m_stdap, k_m_stdap), but when they are the default magnitudes, it generally implies that they are low quality measurements. "6" - The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". This is used for pairs of sources which are detected and resolved in another band, but are detected and not resolved in this band. This differs from a rd_flg="0" because in this case there is a detection of the source in this band, but it is not consistently resolved across all bands. "9" - The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". This is used for sources that were nominally detected in this band, but which could not have a useful brightness measurement from either profile fitting or aperture photometry. This often occurs in highly confused regions, or very near Tile edges where a significant fraction of the measurement aperture of sky annulus falls off the focal plane.
bl_flg	%3s	---	no	Blend flag. Three character flag, one character per band [JHKs], that indicates the number of components that were fit simultaneously when estimating the brightness of a source: "0" - Source is not detected, or is inconsistently deblended in that band. "1" - One component was fit to the source in R_2 profile-fitting photometry (rd_flg="2"), or default magnitudes are from aperture photometry (rd_flg="1" or "4") or saturated star 1-d radial profile-fitting (rd_flg="3"). ">1" - More than one component was fit simultaneously during R2 profile-fit photometry, where the value of the field is the number of components simultaneously fit. The maximum number of components is 7 in any band for the PSC, so this bl_flg is always a three character flag. Multi-component fitting occurs only for profile-fitting, and only when more than one detection is found within ~5". Single detections that are not well-fit by a single PSF are not split.
cc_flg	%3s	---	no	Contamination and confusion flag. Three character flag, one character per band [JHKs], that indicates that the photometry and/or position measurements of a source may be contaminated or biased due to proximity to an image artifact or nearby source of equal or greater brightness. The cc_flg in each band is set in hierarchical order according to the following table, in the event a source is affected by more than one artifact or condition: "p" = Persistence. Source may be contaminated by a latent image left by a nearby bright star. "c" = Photometric Confusion. Source photometry is biased by a nearby star that has contaminated the background estimation. This is very common in high source density regions. "d" = Diffraction spike confusion. Source may be contaminated by a diffraction spike from a nearby star. "s" = Electronic stripe. Source measurement may be contaminated by a stripe from a nearby bright star. "b" = Bandmerge confusion. In the process of merging detections in the different bands for this source, there was more than one possible match between the different band components. This occurs in regions of very high source density, or when multiple sources were split in one band but not another. "0" = Source is unaffected by known artifacts, or is not detected in the band. Non-zero values the cc_flg in any band is an indicator that the measurements of that source may be contaminated.
ndet	%6s	---	no	Frame detection statistics. A six-character flag, two characters per band [JJHHKsKs], that indicates the number frames on which a source was detected, N, and the number of frames on which the source could have been measured, M. The first digit in the pair for each band, N, gives the number of frames on which there were >3 sigma aperture photometry detections of the source. The second digit for each band, M, gives the number of frames on which aperture measurements were possible. Normally, M=6, (occasionally M=7 because the scanning step size was slightly less than 1/6 of the frame size). M can be <6 if frames are "lost" because: a) there were masked pixels within the source aperture due to cosmic ray detections, noisy pixels, meteor trails, etc, or b) there were saturated pixels within the source aperture. Values of M < 6 are not uncommon, but do indicate an effective loss of coverage and sensitivity for a source. The values of N and M for a band always pertain to the aperture photometry on the 51 ms "Read_1" exposures if rd_flg="1", and to the aperture photometry on the 1.3 s "Read_2" exposures if rd_flg="2" or "4". Sources that are saturated on all of the Read_1 frames (rd_flg="3") have N=0 because no aperture photometry was possible. Sources with signal-to-noise ratios >8-9 should be detected on all available frames. Values of N < M for such sources are an indication of possible loss of measurement integrity. Values of N < M, or even N=0, are normal for fainter sources because they are too faint on individual frames to yield a >3 sigma detection.
prox	%5.1f	arcsec	no	Proximity. The distance between this source and its nearest neighbor in the PSC. The pts_key of the nearest source is given in the pxcntr column. The effective resolution of the 2MASS system is approximately 5". Any source with prox < 6" is potentially confused with a nearby object, and should be used with caution.
pxpa	%3d	deg	yes	The position angle on the sky of the vector from the source to the nearest neighbor in the PSC, in degrees East of North. This column in null if prox=0.0, which occurs only for confused sources or from errors in the bandmerge process caused by confusion.
pxcntr	%10d	---	no	The pts_key value of the nearest source in the PSC.
gal_contam	%1d	---	no	Extended source "contamination" flag. A value of gal_contam="2" indicates that this point source falls within the elliptical boundary of an XSC source defined by the semi-major axis and ellipticity of the 20 mag arcsec-2 Ks-band elliptical isophote (r_k20fe) +10%, for XSC sources where r_k20fe is >10''. Sources so indicated are often foreground stars superimposed on background galaxies, or sometimes extractions of pieces of the galaxy or nebula. The point source photometry for these sources is probably contaminated by the surrounding structured extended emission. Point sources can still be superimposed on extended sources and remain unflagged if the XSC source shape is not well-described by an ellipse. This flag also denotes (gal_contam="1") PSC sources that are equivalent to sources in the XSC, but only for XSC sources with r_k20fe is >10''. Since most XSC sources have semi-major axes <10'', gal_contam does not identify all PSC sources with exact XSC counterparts. Use the ext_key to identify all PSC sources that were found to be resolved relative to a single point-spread function.. "0" - Source does not fall within the elliptical profile of an extended source with semi-major axis >10'', or it is not identified exactly with an XSC source with semi-major axis >10''. However, the source may correspond exactly to a smaller XSC source. "1" - Source is resolved by 2MASS, and is equivalent to a source in the XSC that has a semi-major axis >10'' in size. Users must refer to the ext_keyto identify all PSC sources with XSC counterparts. "2" - Source falls within the elliptical boundary of an XSC source that has a semi-major axis >10'' in size.
mp_flg	%1d	---	no	Minor Planet Flag. Indicates if this source is associated with the predicted position of a known minor planet, comet, planet or planetary satellite. This association does not guarantee that the PSC source is a detection of the solar system object. "0" - Source is not associated with a known solar system object "1" - Source is associated with the predicted position of a known solar system object. The name and orbital data for the associated objects are given in the Known Asteroid Detection List, Known Comet Detection List, and Planet and Planetary Satellite Detection List. The associated PSC source is cross-referenced in those Lists via the value of pts_key
Additional Positional and Identification Information
pts_key/cntr	%10d	---	no	A unique identification number for the PSC source. This column is called pts_key in the DVD and ftp versions of the PSC and cntr in the IRSA/GATOR version. This sequential number was defined when source records from final data processing were loaded into the Point Source Working Database. Pts_key is incremented in order (or reverse order depending on the scan direction) of declination within a scan. For this reason, on average sources with close pts_keyvalues are close to each other on the sky, except at Tile boundaries. Pts_key ordering thus provides a useful mapping of the 2MASS release on storage media. PSC sources are cross-referenced in the XSC, Known Asteroid Detection List, Known Comet Detection List, and Planet and Planetary Satellite Detection List via the value of pts_key.
hemis	%1s	---	no	Hemisphere code for the 2MASS Observatory from which this source was observed. "n" = North/Mt. Hopkins "s" = South/CTIO
date	%10s	yyyy-mm-dd	no	The observation reference date for this source expressed in ISO standard format. This is the UT day value at sunrise for the night on which the source was observed. Because it is possible for the UT day to change during a night of observations, the actual UT date for a source measurement can differ from date by one day. Use the Julian Day value (jdate) for a more accurate determination of the observation time of the source.
scan	%3d	---	no	The nightly scan number in which the source was detected.
glon	%7.3f	deg	no	Galactic longitude. Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg.
glat	%7.3f	deg	no	Galactic latitude. Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg.
x_scan	%6.1f	arcsec	no	Mean cross-scan focal plane position of the source in the Universal scan (U-scan) coordinate system. This is the approximate distance a source lies west or east of the focal plane centerline. Positive values of x_scan indicate that the source falls west of the centerline and negative values indicate the source is east of the centerline. The focal plane position is approximate because it is derived from the mean position of the source detected on up to seven different frames and three different bands. The U-scan coordinate system combines the pixels from the three arrays from each camera, and follows the near-great-circle path of the scan across the sky. The x_scan value is useful for identifying sources that may be caused or affected by hot pixel events.
jdate	%12.4f	day	no	The Julian Date of the source measurement accurate to +30 seconds. This value is extrapolated from the start time of the Survey scan using the difference between the declinations of the source and the first row in the Tile divided by the scanning rate of the telescope (approximately 57"/sec). The scanning rate of the two 2MASS telescopes was slightly different because of the need to optimize the dithering of images on the arrays.
Additional Photometric Information
j_psfchi	%6.2f	---	yes	Reduced chi-squared goodness-of-fit value for the J-band profile-fit photometry made on the 1.3 s "Read_2" exposures. Unresolved sources that are well-fit by a single PSF should have j_psfchi~1.0. Values >2 indicate that the source was not well-fit by a single PSF and that the profile-fitting measurement may not accurately capture the flux of the object. This can occur if the source is resolved, part of a multiple star group, or is corrupted by a cosmic ray or hot pixel event. The j_psfchi value is useful as an indicator of photometric quality only if rd_flg[1]="2" for the source, indicating that the default J magnitude (j_m) is from a profile-fitting measurement. A non-null value for j_psfchi may be listed for sources that have rd_flg[1]="1". However, these are the goodness-of-fits made on saturated star images on the "Read_2" exposures, and do not relate to the aperture photometry magnitude reported in j_m in these cases. This field is null for rd_flg[1]="0","3","4","6" or "9".
h_psfchi	%6.2f	---	yes	Reduced chi-squared goodness-of-fit value for the H-band profile-fit photometry made on the 1.3 s "Read_2" exposures. Unresolved sources that are well-fit by a single PSF should have h_psfchi~1.0. Values >2 indicate that the source was not well-fit by a single PSF and that the profile-fitting measurement may not accurately capture the flux of the object. This can occur if the source is resolved, part of a multiple star group, or is corrupted by a cosmic ray or hot pixel event. The h_psfchi value is useful as an indicator of photometric quality only if rd_flg[2]="2" for the source, indicating that the default H magnitude (h_m) is from a profile-fitting measurement. A non-null value for h_psfchi may be listed for sources that have rd_flg[2]="1". However, these are the goodness-of-fits made on saturated star images on the "Read_2" exposures, and do not relate to the aperture photometry magnitude reported in h_m in these cases. This field is null for rd_flg[2]="0","3","4","6" or "9".
k_psfchi	%6.2f	---	yes	Reduced chi-squared goodness-of-fit value for the Ks-band profile-fit photometry made on the 1.3 s "Read_2" exposures. Unresolved sources that are well-fit by a single PSF should have k_psfchi~1.0. Values >2 indicate that the source was not well-fit by a single PSF and that the profile-fitting measurement may not accurately capture the flux of the object. This can occur if the source is resolved, part of a multiple star group, or is corrupted by a cosmic ray or hot pixel event. The k_psfchi value is useful as an indicator of photometric quality only if rd_flg[3]="2" for the source, indicating that the default J magnitude (k_m) is from a profile-fitting measurement. A non-null value for k_psfchi may be listed for sources that have rd_flg[3]="1". However, these are the goodness-of-fits made on saturated star images on the "Read_2" exposures, and do not relate to the aperture photometry magnitude reported in k_m in these cases. This field is null for rd_flg[3]="0","3","4","6" or "9".
j_m_stdap	%6.3f	mag	yes	J-band "standard" aperture magnitude. This is the curve-of-growth corrected average brightness measured in a 4" radius aperture centered on the source position on each of the available 1.3 s "Read_2" frames. The background sky reference on each frame is measured in an annular region with inner radius of 14" and outer radius of 20". Non-detections on individual frames are included in the average so that the flux is not statistically overestimated. The curve-of-growth correction adjusts to an "infinite" aperture using a normalization value derived from a series of multi-aperture measurements made from many stars having the same seeing FWHM as the source that is corrected. The amplitude of the correction is tabulated in the j_ap_cor value in the Atlas Image Data Table (NOT YET AVAILABLE). This column can contain a measurement even if the default magnitude is from the 51 ms "Read_1" exposures (rd_flg="1"). In this case, the value is the aperture measurement from the available non-saturated 1.3 s "Read_2" exposures. This column is null if the source is not detected in the J-band (rd_flg[1]="0"), or if it is saturated in all of the 1.3 s "Read 2" J-band exposures.
j_msig_stdap	%5.3f	mag	yes	Uncertainty in the J-band standard aperture magnitude. If there was more than one 1.3 s "Read_2" frame available for aperture photometry, this the RMS residual of the brightness measured on the individual frames. If there was only one frame available, this is the uncertainty derived from the single measurement using the poisson statistics of the fluxes in the aperture and sky annulus. This column is null if the source is not detected in the J-band (rd_flg[1]="0"), or if it is saturated in all of the 1.3 s "Read 2" J-band exposures.
h_m_stdap	%6.3f	mag	yes	H-band "standard" aperture magnitude. This is the curve-of-growth corrected average brightness measured in a 4" radius aperture centered on the source position on each of the available 1.3 s "Read_2" frames. The background sky reference on each frame is measured in an annular region with inner radius of 14" and outer radius of 20". Non-detections on individual frames are included in the average so that the flux is not statistically overestimated. The curve-of-growth correction adjusts to an "infinite" aperture using a normalization value derived from a series of multi-aperture measurements made from many stars having the same seeing FWHM as the source that is corrected. The amplitude of the correction is tabulated in the h_ap_cor value in the Atlas Image Data Table (NOT YET AVAILABLE). This column can contain a measurement even if the default magnitude is from the 51 ms "Read_1" exposures (rd_flg="1"). In this case, the value is the aperture measurement from the available non-saturated 1.3 s "Read_2" exposures. This column is null if the source is not detected in the H-band (rd_flg[1]="0"), or if it is saturated in all of the 1.3 s "Read 2" H-band exposures.
h_msig_stdap	%5.3f	mag	yes	Uncertainty in the H-band standard aperture magnitude. If there was more than one 1.3 s "Read_2" frame available for aperture photometry, this the RMS residual of the brightness measured on the individual frames. If there was only one frame available, this is the uncertainty derived from the single measurement using the poisson statistics of the fluxes in the aperture and sky annulus. This column is null if the source is not detected in the H-band (rd_flg[2]="0"), or if it is saturated in all of the 1.3 s "Read 2" H-band exposures.
k_m_stdap	%6.3f	mag	yes	Ks-band "standard" aperture magnitude. This is the curve-of-growth corrected average brightness measured in a 4" radius aperture centered on the source position on each of the available 1.3 s "Read_2" frames. The background sky reference on each frame is measured in an annular region with inner radius of 14" and outer radius of 20". Non-detections on individual frames are included in the average so that the flux is not statistically overestimated. The curve-of-growth correction adjusts to an "infinite" aperture using a normalization value derived from a series of multi-aperture measurements made from many stars having the same seeing FWHM as the source that is corrected. The amplitude of the correction is tabulated in the k_ap_cor value in the Atlas Image Data Table (NOT YET AVAILABLE). This column can contain a measurement even if the default magnitude is from the 51 ms "Read_1" exposures (rd_flg="1"). In this case, the value is the aperture measurement from the available non-saturated 1.3 s "Read_2" exposures. This column is null if the source is not detected in the Ks-band (rd_flg[1]="0"), or if it is saturated in all of the 1.3 s "Read 2" Ks-band exposures.
k_msig_stdap	%5.3f	mag	yes	Uncertainty in the Ks-band standard aperture magnitude. If there was more than one 1.3 s "Read_2" frame available for aperture photometry, this the RMS residual of the brightness measured on the individual frames. If there was only one frame available, this is the uncertainty derived from the single measurement using the poisson statistics of the fluxes in the aperture and sky annulus. This column is null if the source is not detected in the Ks-band (rd_flg[3]="0"), or if it is saturated in all of the 1.3 s "Read 2" Ks-band exposures.
Additional Source Quality Information
dist_edge_ns	%5d	arcsec	no	The distance from the source to the nearest North or South scan edge. The scan edge is defined by the great-circle interpolation between the 3-band coverage corners. The equatorial coordinates of the 3-band coverage corners are given in the Scan Information Table (NOT YET AVAILABLE), referenced by thescan_key. The first character of the dist_edge_flg indicates to which edge the source is closer.
dist_edge_ew	%3d	arcsec	no	The distance from the source to the nearest East or West scan edge. The scan edge is defined by the great-circle interpolation between the 3-band coverage corners. The equatorial coordinates of the 3-band coverage corners are given in the Scan Information Table (NOT YET AVAILABLE), referenced by thescan_key. The second character of the dist_edge_flg indicates to which edge the source is closer.
dist_edge_flg	%2s	---	no	Two character flag that specifies to which scan edges a source lies closest, and to which edges the dist_edge_ns and dist_edge_ew values refer. The first character encodes the N/S edge: "n" means that dist_edge_ns refers to north scan edge, "s" means that dist_edge_ns refers to the south scan edge. The second character encodes the E/W edge: "e" means that dist_edge_ew refers to the east scan edge, "w" means that dist_edge_ew refers to the west scan edge.
dup_src	%1d	---	no	Duplicate source flag. Used in conjunction with the use_src flag, this numerical flag indicates whether the source falls in a Tile overlap region, and if so, if it was detected multiple times. "0" = The source does not fall within a Tile overlap region (use_src="1"), or it falls in an overlap region and there were no sources detected within 2" of its position in the overlapping Tile (use_src="0"). "1" = The source falls within a Tile overlap region, and there is one source detected within 2" of its position in the overlapping Tile. ">1" = The source falls within a Tile overlap region, and there are multiple sources detected within 2" of its position in the overlapping Tile, and/or within its own Tile. This implies confusion in the multiple source resolution procedure.
use_src	%1d	---	no	Use source flag. Used in conjunction with the dup_src flag, this numerical flag indicates if a source falls within a Tile overlap region, and whether or not it satisfies the unbiased selection rules for multiple source resolution. "1" = The source does not fall in a Tile overlap region (dup_src="0"), or it falls in an overlap region, but lies farther from its scan edge than any apparition of the source in another Tile. A source must have use_src="1" to be considered part of the sub-Catalog that satisfies the 2MASS Level 1 Science Requirements "0" = The source falls in a Tile overlap region, but does not have a detection within 2" of its position in any overlapping Tiles. PSC sources withuse_src="0" will always have dup_src="0". Such objects are usually faint, and thus toggling above and below the detection limits, or may have moved between the scans of the different Tiles.
Optical Source Association Information
a	%1s	---	no	Catalog identifier of an optical source from either the Tycho 2 or USNO-A2.0 catalog that falls within ~5" of the 2MASS source position. An association with Tycho 2 takes precedence over USNO-A2.0. The values of this column can be: "0" = no optical source positionally associated with 2MASS source "T" = Tycho 2 catalog source positionally associated with 2MASS source "U" = USNO-A2.0 catalog source positionally associated with 2MASS source Positional association between the 2MASS PSC source and an optical catalog source does not guarantee an identification. Users should consider theseparation between the sources, the number of possible optical matches, and consider proper motion when assessing optical counterparts to 2MASS sources. The optical association information is unreliable for sources with \|dec\|>86° because of an error in the 2MASS/USNO-A2.0 position correlation procedure that caused associations to be missed in the vicinity of the equatorial poles. If the source has \|dec\|>86°, a value of a="0" does not necessarily mean that there is not an optical association within 5´´ of the 2MASS position.
dist_opt	%3.1f	arcsec	yes	Distance separating 2MASS source position and associated optical source within 5". For Tycho 2 associations (a="T"), the separation is computed for the position of the Tycho 2 source corrected for proper motion to the time of the 2MASS observation (if proper motions are provided in Tycho 2). This column isnull if there is no associated optical source (a="0").
phi_opt	%4d	deg	yes	Position angle on the sky of the vector from the the associated optical source to the 2MASS source position, in degrees East of North. This is opposite to the sense of prox which is the vector from the 2MASS source position to the nearest neighbor in the PSC. This column is null if there is no associated optical source (a="0").
b_m_opt	%5.2f	mag	yes	Blue magnitude of associated optical source. If Tycho 2 (a="T"), then this is the Johnson B magnitude (BJ, derived from BTycho and VTycho using the transformations given in Høg (2000): BJ-VJ = 0.85(BT-VT). If USNO-A2.0 (a="U"), then this is the photographic blue magnitude. This column is null* if there is no associated optical source (a="0").
vr_m_opt	%5.2f	mag	yes	Visual or red magnitude of the associated optical source. If Tycho 2 (a="T"), then this is the Johnson V magnitude (VJ), derived from BTycho and VTychousing the transformations given in Høg (2000): VJ = VT - 0.09(BT-VT). If USNO-A2.0 (a="U"*), then this is the photographic red magnitude. This column isnull if there is no associated optical source (a="0").
nopt_mchs	%1d	---	no	The number of USNO-A2.0 or Tycho 2 optical sources found within a 5" radius of the 2MASS position. The optical association information is unreliable for sources with \|dec\|>86° because of an error in the 2MASS/USNO-A2.0 position correlation procedure that caused associations to be missed in the vicinity of the equatorial poles. If the source has \|dec\|>86°, a value of nopt_mchs=0 does not necessarily mean that there is not an optical association within 5´´ of the 2MASS position.
Cross-Index Information
ext_key	%7d	---	yes	Unique identification number of the record in the XSC that corresponds to this point source. The XSC record with this ext_key value will have the pts_key for this source in its pts_key column. This allows easy cross-referencing between the two catalogs.
scan_key	%5d	----	no	Unique identification number of the record in the Scan Information Table (NOT YET AVAILABLE) that corresponds to the survey scan in which this source was detected.
coadd_key	%7d	----	no	Unique identification number of the record in the Atlas Image Data Table (NOT YET AVAILABLE) that corresponds to Image in which the position of this source falls.
coadd	%3d	----	no	Sequence number of the Atlas Image in which the position of this source falls. The Image sequence number is number of the frame that is nearest the center of the Image.

2. Scan Information Table

a. Scan Information Table Format

The following table contains brief descriptions of the parameters in the Scan Information Table, which provides basic data for each scan in the 2MASS All Sky Release. The table is organized according to the broad function and utility of the parameters: positional information, photometric information, source detection statistics, etc.

The columns in the following table are:

Column Name: The parameter name in the Scan Information Table. Click on this to go to the section of the Explanatory Supplement where the derivation and/or usage of that parameter is described in detail.

Format: The "C" format of the field in the Scan Information Table. Note that some fields contain null values that will require special handling when parsing the table drawn from either theIRSA/GATOR output or the ascii DVD or ftp versions.

Units: The units of the parameter. A value of "---" in this column means that the parameter is dimensionless.

nulls: A "yes" in this column means that this parameter can be null in the Scan Information Table. A "no" means that there will always be a value in this column in the Scan Information Table. Note that null values are represented differently in the IRSA/GATOR output and the ascii DVD or ftp versions.

Description: A brief description of the parameter and its values.

Column Name	Format	Units	nulls	Description
TABLE 1: Description of Fields in the Scan Information Table
Primary Information
scan_key/cntr	%5d	---	no	The unique identification number for this scan. This column is called scan_key in the DVD and ftp versions of the Scan Information Table and cntr in the IRSA/GATOR version.
hemis	%1s	---	no	Observatory from which data were obtained: "n" = north = Mt. Hopkins "s" = south = Cerro Tololo.
date	%10s	yyyy-mm-dd	no	The observation reference date for this scan expressed in ISO standard format. This is the UT date at sunrise for the night on which the scan was observed. Because it is possible for the UT date to change during a night of observations, the actual UT date for a source can differ from date by one day. Use the Julian Date (jdate) for a more accurate determination of the observation time of the scan.
scan	%3d	---	no	Scan number (unique within date).
tile	%6d	---	no	Tile identification number.
Positional Information
ra	%10.6f	deg	no	Right ascension of scan center for equinox J2000; this is computed from the interior corners ra_[1,2,3,4] and dec_[1,2,3,4] (see below).
dec/decl	%10.6f	deg	no	Declination of scan center for equinox J2000; this is computed from the interior corners ra_[1,2,3,4] and dec_[1,2,3,4] (see below). This column is called declon the DVD versions of the Scan Information Table and dec in the IRSA/GATOR version.
glon	%7.3f	deg	no	Galactic longitude of scan center, as computed from ra and dec above. Galactic coordinates are derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into the lII, bII coordinate system.
glat	%7.3f	deg	no	Galactic latitude of scan center, as computed from ra and dec above. Galactic coordinates are derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into the lII, bII coordinate system.
ra_1	%10.6f	deg	no	J2000 right ascension of the eastern corner at start of scan. This is the corner fully covered by all three bands.
dec_1	%10.6f	deg	no	J2000 declination of the eastern corner at start of scan. This is the corner fully covered by all three bands.
ra_2	%10.6f	deg	no	J2000 right ascension of the western corner at start of scan. This is the corner fully covered by all three bands.
dec_2	%10.6f	deg	no	J2000 declination of the western corner at start of scan. This is the corner fully covered by all three bands.
ra_3	%10.6f	deg	no	J2000 right ascension of the eastern corner at end of scan. This is the corner fully covered by all three bands.
dec_3	%10.6f	deg	no	J2000 declination of the eastern corner at end of scan. This is the corner fully covered by all three bands.
ra_4	%10.6f	deg	no	J2000 right ascension of the western corner at end of scan. This is the corner fully covered by all three bands.
dec_4	%10.6f	deg	no	J2000 declination of the western corner at end of scan. This is the corner fully covered by all three bands.
General Information
sd	%1s	---	no	Scanning direction: "n" = north-going "s" = south-going.
qual	%2d	---	no	Quality score for scan: "10" is highest grade "0" is lowest.
hgl	%1d	---	no	Special flag indicating whether or not this scan has a single-frame H-band or J-band electronic glitch: "0" indicates no glitch "1" indicates glitch.
cld	%1d	---	no	Special flag indicating whether or not a cloud was found in the scan after comparison of its photometry to that of overlapping scans in the database: "0" indicates no evidence for clouds "1" indicates clouds.
xph	%1d	---	no	Special flag indicating whether or not another photometric problem, not obviously cloud related, was found in the scan after comparing its photometry to that of overlapping scans: "0" indicates no problem "1" indicates compromised photometry.
anom	%1d	---	no	Special flag indicating whether or not an unusual problem was found in the Atlas Images for this scan. Such problem include, but are not limited to, residual meteor trails, satellite trails, insect trails, and unusual reflections or glints from bright stars: "0" indicates no such problem "1" indicates an anomaly.
Time of Observation
ut	%9.6f	hr	no	Universal Time (UT) at beginning of scan.
jdate	%12.4f	day	no	Julian Date at beginning of scan.
Telescope and Instrument Fields
airm	%4.2f	---	no	Airmass at beginning of scan.
zd	%4.1f	deg	no	Scan's distance from the zenith at beginning of scan.
ha	%9.6f	hr	no	Hour angle at beginning of scan.
rh	%2d	%	no	Relative humidity of telescope enclosure at beginning of scan.
air_temp	%4.1f	deg C	no	Air temperature at beginning of scan.
tel_temp	%4.1f	deg C	no	Telescope girdle temperature at beginning of scan. This temperature was used to adjust telescope focus to compensate for variations with temperature.
focus	%5d	---	no	Focus setting of telescope at beginning of scan. This is a measure of the position of the focus mechanism, in units of 1.25 microns, relative to a reference position. This reference position changed each time the telescope was collimated.
hry	%1d	---	no	Flag indicating the H-band array configuration for the camera: "0" indicates the original configuration "1" indicates the new (modified) configuration. For the southern camera, the array configuration was never changed, so this flag is always "0". For the northern camera a new H-band array, first used on 13 Sep 1999 (UT), was installed in mid-survey. Before this date the flag is "0" and on or after this date it is "1".
c_strat	%1d	---	no	Flag indicating the calibration strategy for this night's data: "0" indicates original strategy in which two calibration fields were observed after every two-hour segment of regular survey scans "1" indicates new strategy in which one calibration field was observed after every hour's segment of regular survey scans. For data taken from the southern hemisphere, this flag is always "1". For data taken from the northern hemisphere this flag is set to "0" on dates before 11 Oct 1997 (UT), and to "1" for dates of 11 Oct 1997 (UT) or thereafter.
Photometric Information
j_zp_ap	%7.4f	mag	no	Photometric zero-point for J-band aperture photometry.
h_zp_ap	%7.4f	mag	no	Photometric zero-point for H-band aperture photometry.
k_zp_ap	%7.4f	mag	no	Photometric zero-point for Ks-band aperture photometry.
h_zperr_ap	%6.4f	mag	no	RMS-error of zero-point for H-band aperture photometry
k_zperr_ap	%6.4f	mag	no	RMS-error of zero-point for Ks-band aperture photometry
Source Detection Statistics
j_n_snr10	%6d	---	no	Number of point sources at J-band with SNR>10 (instrumental mag <=15.8)
h_n_snr10	%6d	---	no	Number of point sources at H-band with SNR>10 (instrumental mag <=15.1)
k_n_snr10	%6d	---	no	Number of point sources at Ks-band with SNR>10 (instrumental mag <=14.3)
n_ext	%3d	---	no	Number of regular extended sources detected in scan.
Seeing Statistics
j_shape_avg	%5.3f	---	no	J-band average seeing shape for scan. The seeing full-width at half maximum (in arcseconds) can be obtained from the approximate relation FWHM(arcseconds) = 3.13(j_shape_avg) - 0.46*.
h_shape_avg	%5.3f	---	no	H-band average seeing shape for scan. The seeing full-width at half maximum (in arcseconds) can be obtained from the approximate relationFWHM(arcseconds) = 3.13*(h_shape_avg) - 0.46.
k_shape_avg	%5.3f	---	no	Ks-band average seeing shape for scan. The seeing full-width at half maximum (in arcseconds) can be obtained from the approximate relationFWHM(arcseconds) = 3.13*(k_shape_avg) - 0.46.
j_shape_rms	%5.3f	---	no	RMS-error of J-band average seeing shape.
h_shape_rms	%5.3f	---	no	RMS-error of H-band average seeing shape.
k_shape_rms	%5.3f	---	no	RMS-error of Ks-band average seeing shape.
j_2mrat	%5.3f	---	no	J-band average 2nd image moment ratio.
h_2mrat	%5.3f	---	no	H-band average 2nd image moment ratio.
k_2mrat	%5.3f	---	no	Ks-band average 2nd image moment ratio.
Sensitivity Statistics
j_psp	%6.3f	---	no	J-band photometric sensitivity paramater (PSP).
h_psp	%6.3f	---	no	H-band photometric sensitivity parameter (PSP).
k_psp	%6.3f	---	no	Ks-band photometric sensitivity parameter (PSP).
j_pts_noise	%7.3f	---	no	The base-10 logarithm of the characteristic J-band point source scan noise, in units of log(mJy). This is the mode of the distribution of the noise-equivalent flux densities for all J-band R2-R1 detections in the scan. The noise-equivalent flux density for each detection is given by 1603x103(mJy)1.0857/sigma_m, where sigma_m is the photometric uncertainty, in magnitudes, before correction. 1603x103 mJy was a preliminary estimate of the J-band flux-for-zero-magnitude, and it differs slightly from the final estimate of 1592x103 mJy that is described in VI.4.a. To adjust the given value of j_pts_noise* for the final calibration, subtract 0.0030.
h_pts_noise	%7.3f	---	no	The base-10 logarithm of the characteristic H-band point source scan noise, in units of log(mJy). This is the mode of the distribution of the noise-equivalent flux densities for all H-band R2-R1 detections in the scan. The noise-equivalent flux density for each detection is given by 1075x103(mJy)1.0857/sigma_m, where sigma_m is the photometric uncertainty, in magnitudes, before correction. 1075x103 mJy was a preliminary estimate of the H-band flux-for-zero-magnitude, and it differs slightly from the final estimate of 1024x103 mJy that is described in VI.4.a. To adjust the given value of h_pts_noise* for the final calibration, subtract 0.0211.
k_pts_noise	%7.3f	---	no	The base-10 logarithm of the characteristic Ks-band point source scan noise, in units of log(mJy). This is the mode of the distribution of the noise-equivalent flux densities for all Ks-band R2-R1 detections in the scan. The noise-equivalent flux density for each detection is given by 698.1x103(mJy)1.0857/sigma_m, where sigma_m is the photometric uncertainty, in magnitudes, before correction. 698.1x103 mJy was a preliminary estimate of the Ks-band flux-for-zero-magnitude, and it differs slightly from the final estimate of 666.8x103 mJy that is described in VI.4.a. To adjust the given value of k_pts_noise* for the final calibration, subtract 0.0199.
j_msnr10	%5.2f	---	no	The J-band magnitude at which SNR=10 is achieved for this scan, estimated using the photometric sensitivity parameter j_psp and zero point offset j_zp_ap. This estimate does not take into account the effect of confusion noise in high source density regions.
h_msnr10	%5.2f	---	no	The H-band magnitude at which SNR=10 is achieved for this scan, estimated using the photometric sensitivity parameter h_psp and zero point offset h_zp_ap. This estimate does not take into account the effect of confusion noise in high source density regions.
k_msnr10	%5.2f	---	no	The Ks-band magnitude at which SNR=10 is achieved for this scan, estimated using the photometric sensitivity parameter k_psp and zero point offset k_zp_ap. This estimate does not take into account the effect of confusion noise in high source density regions.
Information on Previous Releases
rel0	%1d	---	no	Flag indicating whether the scan is contained in the 2MASS Sampler Release. "0" indicates non-inclusion in Sampler Release "1" indicates inclusion in Sampler Release.
rel1	%1d	---	no	Flag indicating whether the scan is contained in the 2MASS First Incremental Data Release (IDR1). "0" indicates non-inclusion in IDR1 "1" indicates inclusion in IDR1.
rel2	%1d	---	no	Flag indicating whether the scan is contained in the 2MASS Second Incremental Data Release (IDR2). "0" indicates non-inclusion in IDR2 "1" indicates inclusion in IDR2.

3. XSC Parameters

a. Column Descriptions

The XSC contains 389 columns of information per source (most of which is photometry.) Because extended sources are much more complicated than a point source, it takes many more parameters to characterize them. Some parameters are required to describe the spatial extent of a source, and many more are required to characterize the photometry. In addition to a number of standard measures of photometry, the xsc also reports the magnitude as measured in a number of different fixed-size apertures. The columns are described in the tables below. We have separated the columns according to their basic function and utility.

Photometry algorithms and performance can be found here: Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
The XSC FAQ and Primer is here: How to Use the 2MASS XSC -- FAQ Sheet.

Name/Position Info Standard Photometry & Orientation Large Aperture Photometry Miscellaneous Photometry and Characterization

A. Name and Position Information

column	Parameter Name	View	Format	Units	Description
1	jdate	L	13.4f	day	Julian date of the source measurement accurate to ±3 minutes. This value is the mean Julian date of the scan observation in which this source falls. For a more precise value of Julian date for this source, see the jdate entry in the PSC using the pts_key index as a cross-reference.
---	Position Information
2	designation	S	17s	-	Source designation formed from sexigesimal coordinates. This is the object sequence designation, or object "name" as specified by the IAU recommendations on source nomenclature. It is derived from the J2000 sexigesimal coordinates of the source and has the form HHMMSSSS+/-DDMMSSS, where HH are the hours of right ascension, MM the RA minutes and SSS are the deci-seconds of RA. DD are the degrees in declination, MM are DEC minutes and SS the declination seconds. Note that both the RA deci-seconds of time and DEC seconds of arc are truncated rather than rounded, per the IAU recommendation. The full naming convention for 2MASS All-Sky Release sources has the form "2MASX Jhhmmssss+ddmmsss[ABC...]", where "2MASX" indicates that the source is from the All-Sky XSC, "J" indicates the position is J2000, and the optional trailing letters are used to distinguish sources with otherwise duplicate names. The"2MASX J" prefix is not listed explicitly in the designation column.
3	ra	S	10.6f	deg	Right ascension (J2000 decimal deg) based on peak pixel.
4	dec/decl	S	10.6f	deg	Declination (J2000 decimal deg) based on peak pixel.
5	sup_ra	L	10.6f	deg	Super-coadd centroid RA (J2000 decimal deg).
6	sup_dec	L	10.6f	deg	Super-coadd centroid Dec (J2000 decimal deg).
7	glon	L	7.3f	deg	Galactic longitude (decimal deg) based on peak pixel. Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg.
8	glat	L	7.3f	deg	Galactic latitude (decimal deg) based on peak pixel. Galactic coordinate for 2MASS source derived by precessing reconstructed ra and dec to B1950, and performing rotational transformation into lII, bII coordinate system. This coordinate should not be used as an astrometric reference because it has been rounded to 0.001 deg.
9	density	L	5.2f	-	Coadd log(density) of stars with k<14 mag. See Stellar Number Density Metric: "density".

B. Standard (recommended) Photometry: Isophotal Apertures Based on the Ks 20 mag/arcsec^2 Elliptical Isophote, and 2-D Orientation

column	Parameter Name	View	Format	Units	Description
---	Isophotal photom at 20 using K fiducial ellip ap
10	r_k20fe	S	6.1f	arcsec	20mag/sq." isophotal K fiducial ell. ap. semi-major axis. "Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
11	j_m_k20fe	S	6.3f	mag	J 20mag/sq." isophotal fiducial ell. ap. magnitude. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
12	j_msig_k20fe	S	5.3f	mag	J 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.
13	j_flg_k20fe	S	1hd	-	J confusion flag for 20mag/sq." iso. fid. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
14	h_m_k20fe	S	6.3f	mag	H 20mag/sq." isophotal fiducial ell. ap. magnitude. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
15	h_msig_k20fe	S	5.3f	mag	H 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.
16	h_flg_k20fe	S	1hd	-	H confusion flag for 20mag/sq." iso. fid. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
17	k_m_k20fe	S	6.3f	mag	K 20mag/sq." isophotal fiducial ell. ap. magnitude. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
18	k_msig_k20fe	S	5.3f	mag	K 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.
19	k_flg_k20fe	S	1hd	-	K confusion flag for 20mag/sq." iso. fid. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Elliptical Isophotal Orientation
20	r_3sig	L	5.1f	arcsec	3-sigma K isophotal semi-major axis.
21	j_ba	L	5.3f	-	J minor/major axis ratio fit to the 3-sigma isophote.
22	j_phi	L	3hd	deg	J angle to 3-sigma major axis (E of N).
23	h_ba	L	5.3f	-	H minor/major axis ratio fit to the 3-sigma isophote.
24	h_phi	L	3hd	deg	H angle to 3-sigma major axis (E of N).
25	k_ba	S	5.3f	-	K minor/major axis ratio fit to the 3-sigma isophote.
26	k_phi	S	3hd	deg	K angle to 3-sigma major axis (E of N).
27	sup_r_3sig	L	5.1f	arcsec	Super-coadd 3-sigma isophotal semi-major axis radius.
28	sup_ba	S	5.3f	-	Minor/major axis ratio fit to 3-sig. super-coadd isophote.
29	sup_phi	S	3hd	deg	Super-coadd angle to major axis (E of N).

C. Large Apertures, including Kron and Total Versions, and Surface Brightness

column	Parameter Name	View	Format	Units	Description
---	Photometry using Kron elliptical aperture
30	r_fe	L	6.1f	arcsec	K fiducial Kron elliptical aperture semi-major axis. "Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
31	j_m_fe	L	6.3f	mag	J fiducial Kron elliptical aperture magnitude. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
32	j_msig_fe	L	5.3f	mag	J 1-sigma uncertainty in fiducial Kron ell. mag.
33	j_flg_fe	L	1hd	-	J confusion flag for fiducial Kron ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
34	h_m_fe	L	6.3f	mag	H fiducial Kron elliptical aperture magnitude. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
35	h_msig_fe	L	5.3f	mag	H 1-sigma uncertainty in fiducial Kron ell. mag.
36	h_flg_fe	L	1hd	-	H confusion flag for fiducial Kron ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
37	k_m_fe	L	6.3f	mag	K fiducial Kron ell. mag aperture magnitude. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
38	k_msig_fe	L	5.3f	mag	K 1-sigma uncertainty in fiducial Kron ell. mag.
39	k_flg_fe	L	1hd	-	K confusion flag for fiducial Kron ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Total Photometry from extrapolation of fit to radial profile
40	r_ext	S	7.2f	arcsec	extrapolation/total radius. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
41	j_m_ext	S	6.3f	mag	J mag from fit extrapolation. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
42	j_msig_ext	L	5.3f	mag	J 1-sigma uncertainty in mag from fit extrapolation.
43	j_pchi	S	6.3f	-	J chi^2 of fit to rad. profile (LCSB: alpha scale len). If the source is not an LCSB, these fields contain the reduced chi-squared values for each band of the modified exponential fits to the elliptical radial profiles, used for extrapolation and half-light estimates. For LCSBs, they contain the alpha scale lengths.
44	h_m_ext	S	6.3f	mag	H mag from fit extrapolation. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
45	h_msig_ext	S	5.3f	mag	H 1-sigma uncertainty in mag from fit extrapolation.
46	h_pchi	L	6.3f	-	H chi^2 of fit to rad. profile (LCSB: alpha scale len). If the source is not an LCSB, these fields contain the reduced chi-squared values for each band of the modified exponential fits to the elliptical radial profiles, used for extrapolation and half-light estimates. For LCSBs, they contain the alpha scale lengths.
47	k_m_ext	S	6.3f	mag	K mag from fit extrapolation. See Large Aperture Photometry: Profile Fitting, Isophotal & Total Mags.
48	k_msig_ext	S	5.3f	mag	K 1-sigma uncertainty in mag from fit extrapolation.
49	k_pchi	L	6.3f	-	K chi^2 of fit to rad. profile (LCSB: alpha scale len). If the source is not an LCSB, these fields contain the reduced chi-squared values for each band of the modified exponential fits to the elliptical radial profiles, used for extrapolation and half-light estimates. For LCSBs, they contain the alpha scale lengths.
---	Effective radii and mean surface brightness
50	j_r_eff	L	6.2f	arcsec	J half-light (integrated half-flux point) radius. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
51	j_mnsurfb_eff	L	5.2f	mag	J mean surface brightness at the half-light radius. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
52	h_r_eff	L	6.2f	arcsec	H half-light (integrated half-flux point) radius. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
53	h_mnsurfb_eff	L	5.2f	mag	H mean surface brightness at the half-light radius. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
54	k_r_eff	L	6.2f	arcsec	K half-light (integrated half-flux point) radius. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
55	k_mnsurfb_eff	L	5.2f	mag	K mean surface brightness at the half-light radius. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
56	j_con_indx	L	5.2f	-	J concentration index r_75%/r_25%. The concentration index for the galaxy in each band is the ratio of the radii which contain 75% and 25% of the total light, r_75%/r_25%. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
57	h_con_indx	L	5.2f	-	H concentration index r_75%/r_25%. The concentration index for the galaxy in each band is the ratio of the radii which contain 75% and 25% of the total light, r_75%/r_25%. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
58	k_con_indx	L	5.2f	-	K concentration index r_75%/r_25%. The concentration index for the galaxy in each band is the ratio of the radii which contain 75% and 25% of the total light, r_75%/r_25%. See Half-Light "Effective" Aperture & Concentration Index Beware the circularizing effect of the PSF on small galaxies. See The 2MASS Beam.
59	j_peak	L	6.2f	mag	J peak pixel brightness.
60	h_peak	L	6.2f	mag	H peak pixel brightness.
61	k_peak	L	6.2f	mag	K peak pixel brightness.
62	j_5surf	L	6.2f	mag	J central surface brightness (r<=5).
63	h_5surf	L	6.2f	mag	H central surface brightness (r<=5).
64	k_5surf	L	6.2f	mag	K central surface brightness (r<=5).

D. Miscellaneous Photometry and Characterization Measures

column	Parameter Name	View	Format	Units	Description
---	Star-Galaxy Discrimination Scores
65	e_score	L	5.2f	-	extended score: 1(extended) < e_score < 2(point-like). See the FAQ: Star-Galaxy Separation: How do the E and G-scores work?
66	g_score	L	5.2f	-	galaxy score: 1(extended) < g_score < 2(point-like). See the FAQ: Star-Galaxy Separation: How do the E and G-scores work?
67	vc	L	2hd	-	visual verification score for source. The visual classification score gives the source type for those sources examined "by eye": -2 = unknown -1 = no verification (i.e., not examined) 1 = galaxy 2 = non-extended (e.g., star, double, triple, artifact) See Visual Inspection of Extended Sources
68	cc_flg	S	1s	-	indicates artifact contamination and/or confusion. The contamination/confusion flag indicates whether the source's photometry and position may be affected by artifacts of, or confusion with, nearby bright stars. The flag consists of a single character string. Sources are tested for contamination and/or confusion in the order given below, and once a flag is applied to the source, testing is stopped in that band. The flag values indicate the source may be: U: unreliable source; probable image artifact detection C: affected by confusion with or artifact of a nearby bright star A or a: known artifacts z: in close promity to a large galaxy; these sources are usually junk Z: Derived from the Large Galaxy Atlas 0: default value -- not contaminated See Extended Source Confusion Flag
---	Postage-stamp image parameter
69	im_nx	L	4hd	-	size of postage stamp image in pixels. To access the XSC postage stamp images (both jpeg and FITS versions), click 2MASS All-Sky XSC Full-Resolution Image Server
---	Isophotal photom at 20 using K fiducial circ ap
70	r_k20fc	L	5.1f	arcsec	20mag/sq." isophotal K fiducial circular ap. radius. "Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band. Cautionary note: A negative value in this column indicates that the source measurement was corrupted, usually due to confusion from a nearby source, and the derived radius is not meaningful.
71	j_m_k20fc	L	6.3f	mag	J 20mag/sq." isophotal fiducial circ. ap. mag.
72	j_msig_k20fc	L	5.3f	mag	J 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
73	j_flg_k20fc	L	1hd	-	J confusion flag for 20mag/sq." iso. fid. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
74	h_m_k20fc	L	6.3f	mag	H 20mag/sq." isophotal fiducial circ. ap. mag.
75	h_msig_k20fc	L	5.3f	mag	H 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
76	h_flg_k20fc	L	1hd	-	H confusion flag for 20mag/sq." iso. fid. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
77	k_m_k20fc	L	6.3f	mag	K 20mag/sq." isophotal fiducial circ. ap. mag.
78	k_msig_k20fc	L	5.3f	mag	K 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
79	k_flg_k20fc	L	1hd	-	K confusion flag for 20mag/sq." iso. fid. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Kron elliptical photometry
80	j_r_e	L	5.1f	arcsec	J Kron elliptical aperture semi-major axis.
81	j_m_e	L	6.3f	mag	J Kron elliptical aperture magnitude.
82	j_msig_e	L	5.3f	mag	J 1-sigma uncertainty in Kron elliptical mag.
83	j_flg_e	L	1hd	-	J confusion flag for Kron elliptical mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
84	h_r_e	L	5.1f	arcsec	H Kron elliptical aperture semi-major axis.
85	h_m_e	L	6.3f	mag	H Kron elliptical aperture magnitude.
86	h_msig_e	L	5.3f	mag	H 1-sigma uncertainty in Kron elliptical mag.
87	h_flg_e	L	1hd	-	H confusion flag for Kron elliptical mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
88	k_r_e	L	5.1f	arcsec	K Kron elliptical aperture semi-major axis.
89	k_m_e	L	6.3f	mag	K Kron elliptical aperture magnitude.
90	k_msig_e	L	5.3f	mag	K 1-sigma uncertainty in Kron elliptical mag.
91	k_flg_e	L	1hd	-	K confusion flag for Kron elliptical mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Kron circular photometry
92	j_r_c	L	5.1f	arcsec	J Kron circular aperture radius.
93	j_m_c	L	6.3f	mag	J Kron circular aperture magnitude.
94	j_msig_c	L	5.3f	mag	J 1-sigma uncertainty in Kron circular mag.
95	j_flg_c	L	1hd	-	J confusion flag for Kron circular mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
96	h_r_c	L	5.1f	arcsec	H Kron circular aperture radius.
97	h_m_c	L	6.3f	mag	H Kron circular aperture magnitude.
98	h_msig_c	L	5.3f	mag	H 1-sigma uncertainty in Kron circular mag.
99	h_flg_c	L	1hd	-	H confusion flag for Kron circular mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
100	k_r_c	L	5.1f	arcsec	K Kron circular aperture radius.
101	k_m_c	L	6.3f	mag	K Kron circular aperture magnitude.
102	k_msig_c	L	5.3f	mag	K 1-sigma uncertainty in Kron circular mag.
103	k_flg_c	L	1hd	-	K confusion flag for Kron circular mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Kron photometry using K fiducial circular aperture
104	r_fc	L	5.1f	arcsec	K fiducial Kron circular aperture radius. "Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band.
105	j_m_fc	L	6.3f	mag	J fiducial Kron circular magnitude.
106	j_msig_fc	L	5.3f	mag	J 1-sigma uncertainty in fiducial Kron circ. mag.
107	j_flg_fc	L	1hd	-	J confusion flag for fiducial Kron circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
108	h_m_fc	L	6.3f	mag	H fiducial Kron circular magnitude.
109	h_msig_fc	L	5.3f	mag	H 1-sigma uncertainty in fiducial Kron circ. mag.
110	h_flg_fc	L	1hd	-	H confusion flag for fiducial Kron circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
111	k_m_fc	L	6.3f	mag	K fiducial Kron circular magnitude.
112	k_msig_fc	L	5.3f	mag	K 1-sigma uncertainty in fiducial Kron circ. mag.
113	k_flg_fc	L	1hd	-	K confusion flag for fiducial Kron circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Isophotal photom at 20 mag/sq.arcsec using ell ap
114	j_r_i20e	L	5.1f	arcsec	J 20mag/sq." isophotal elliptical ap. semi-major axis.
115	j_m_i20e	L	6.3f	mag	J 20mag/sq." isophotal elliptical ap. magnitude.
116	j_msig_i20e	L	5.3f	mag	J 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
117	j_flg_i20e	L	1hd	-	J confusion flag for 20mag/sq." iso. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
118	h_r_i20e	L	5.1f	arcsec	H 20mag/sq." isophotal elliptical ap. semi-major axis.
119	h_m_i20e	L	6.3f	mag	H 20mag/sq." isophotal elliptical ap. magnitude.
120	h_msig_i20e	L	5.3f	mag	H 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
121	h_flg_i20e	L	1hd	-	H confusion flag for 20mag/sq." iso. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
122	k_r_i20e	L	5.1f	arcsec	K 20mag/sq." isophotal elliptical ap. semi-major axis.
123	k_m_i20e	L	6.3f	mag	K 20mag/sq." isophotal elliptical ap. magnitude.
124	k_msig_i20e	L	5.3f	mag	K 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
125	k_flg_i20e	L	1hd	-	K confusion flag for 20mag/sq." iso. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Isophotal photom at 20 mag/sq.arcsec using circ ap
126	j_r_i20c	L	5.1f	arcsec	J 20mag/sq." isophotal circular aperture radius.
127	j_m_i20c	L	6.3f	mag	J 20mag/sq." isophotal circular ap. magnitude.
128	j_msig_i20c	L	5.3f	mag	J 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
129	j_flg_i20c	L	1hd	-	J confusion flag for 20mag/sq." iso. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
130	h_r_i20c	L	5.1f	arcsec	H 20mag/sq." isophotal circular aperture radius.
131	h_m_i20c	L	6.3f	mag	H 20mag/sq." isophotal circular ap. magnitude.
132	h_msig_i20c	L	5.3f	mag	H 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
133	h_flg_i20c	L	1hd	-	H confusion flag for 20mag/sq." iso. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
134	k_r_i20c	L	5.1f	arcsec	K 20mag/sq." isophotal circular aperture radius.
135	k_m_i20c	L	6.3f	mag	K 20mag/sq." isophotal circular ap. magnitude.
136	k_msig_i20c	L	5.3f	mag	K 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
137	k_flg_i20c	L	1hd	-	K confusion flag for 20mag/sq." iso. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Isophotal photom at 21 mag/sq.arcsec using ell ap
138	j_r_i21e	L	5.1f	arcsec	J 21mag/sq." isophotal elliptical ap. semi-major axis.
139	j_m_i21e	L	6.3f	mag	J 21mag/sq." isophotal elliptical ap. magnitude.
140	j_msig_i21e	L	5.3f	mag	J 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
141	j_flg_i21e	L	1hd	-	J confusion flag for 21mag/sq." iso. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
142	h_r_i21e	L	5.1f	arcsec	H 21mag/sq." isophotal elliptical ap. semi-major axis.
143	h_m_i21e	L	6.3f	mag	H 21mag/sq." isophotal elliptical ap. magnitude.
144	h_msig_i21e	L	5.3f	mag	H 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
145	h_flg_i21e	L	1hd	-	H confusion flag for 21mag/sq." iso. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
146	k_r_i21e	L	5.1f	arcsec	K 21mag/sq." isophotal elliptical ap. semi-major axis.
147	k_m_i21e	L	6.3f	mag	K 21mag/sq." isophotal elliptical ap. magnitude.
148	k_msig_i21e	L	5.3f	mag	K 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
149	k_flg_i21e	L	1hd	-	K confusion flag for 21mag/sq." iso. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Isophotal photom at 21 using J fiducial ellip ap
150	r_j21fe	L	5.1f	arcsec	21mag/sq." isophotal J fiducial ell. ap. semi-major axis. "Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band.
151	j_m_j21fe	L	6.3f	mag	J 21mag/sq." isophotal fiducial ell. ap. magnitude.
152	j_msig_j21fe	L	5.3f	mag	J 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.
153	j_flg_j21fe	L	1hd	-	J confusion flag for 21mag/sq." iso. fid. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
154	h_m_j21fe	L	6.3f	mag	H 21mag/sq." isophotal fiducial ell. ap. magnitude.
155	h_msig_j21fe	L	5.3f	mag	H 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.
156	h_flg_j21fe	L	1hd	-	H confusion flag for 21mag/sq." iso. fid. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
157	k_m_j21fe	L	6.3f	mag	K 21mag/sq." isophotal fiducial ell. ap. magnitude.
158	k_msig_j21fe	L	5.3f	mag	K 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.
159	k_flg_j21fe	L	1hd	-	K confusion flag for 21mag/sq." iso. fid. ell. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Isophotal photom at 21 using circ ap
160	j_r_i21c	L	5.1f	arcsec	J 21mag/sq." isophotal circular aperture radius.
161	j_m_i21c	L	6.3f	mag	J 21mag/sq." isophotal circular ap. magnitude.
162	j_msig_i21c	L	5.3f	mag	J 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
163	j_flg_i21c	L	1hd	-	J confusion flag for 21mag/sq." iso. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
164	h_r_i21c	L	5.1f	arcsec	H 21mag/sq." isophotal circular aperture radius.
165	h_m_i21c	L	6.3f	mag	H 21mag/sq." isophotal circular ap. magnitude.
166	h_msig_i21c	L	5.3f	mag	H 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
167	h_flg_i21c	L	1hd	-	H confusion flag for 21mag/sq." iso. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
168	k_r_i21c	L	5.1f	arcsec	K 21mag/sq." isophotal circular aperture radius.
169	k_m_i21c	L	6.3f	mag	K 21mag/sq." isophotal circular ap. magnitude.
170	k_msig_i21c	L	5.3f	mag	K 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
171	k_flg_i21c	L	1hd	-	K confusion flag for 21mag/sq." iso. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Isophotal photom at 21 mag/sq.arcsec using J fiducial circ ap
172	r_j21fc	L	5.1f	arcsec	21mag/sq." isophotal J fiducial circular ap. radius. "Fiducial" apertures are determined for each type of total and isophotal photometry measurements as described in the GALWORKS SDS. Essentially, they are used to make mag measurements for each type of photometry with the same aperture size in all three bands. The fiducial band for the total Kron photometry and 20mag/sq." isophotal photometry is the K band, and for the 21mag/sq." isophotal photometry it is the J band.
173	j_m_j21fc	L	6.3f	mag	J 21mag/sq." isophotal fiducial circ. ap. mag.
174	j_msig_j21fc	L	5.3f	mag	J 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
175	j_flg_j21fc	L	1hd	-	J confusion flag for 21mag/sq." iso. fid. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
176	h_m_j21fc	L	6.3f	mag	H 21mag/sq." isophotal fiducial circ. ap. mag.
177	h_msig_j21fc	L	5.3f	mag	H 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
178	h_flg_j21fc	L	1hd	-	H confusion flag for 21mag/sq." iso. fid. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
179	k_m_j21fc	L	6.3f	mag	K 21mag/sq." isophotal fiducial circ. ap. mag.
180	k_msig_j21fc	L	5.3f	mag	K 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
181	k_flg_j21fc	L	1hd	-	K confusion flag for 21mag/sq." iso. fid. circ. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	Photometry from fixed circular aperture
182	j_m_5	L	6.3f	mag	J 5 arcsec radius circular aperture magnitude.
183	j_msig_5	L	5.3f	mag	J 1-sigma uncertainty in 5 arcsec circular ap. mag.
184	j_flg_5	L	1hd	-	J confusion flag for 5 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
185	h_m_5	L	6.3f	mag	H 5 arcsec radius circular aperture magnitude.
186	h_msig_5	L	5.3f	mag	H 1-sigma uncertainty in 5 arcsec circular ap. mag.
187	h_flg_5	L	1hd	-	H confusion flag for 5 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
188	k_m_5	L	6.3f	mag	K 5 arcsec radius circular aperture magnitude.
189	k_msig_5	L	5.3f	mag	K 1-sigma uncertainty in 5 arcsec circular ap. mag.
190	k_flg_5	L	1hd	-	K confusion flag for 5 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
191	j_m_7	L	6.3f	mag	J 7 arcsec radius circular aperture magnitude.
192	j_msig_7	L	5.3f	mag	J 1-sigma uncertainty in 7 arcsec circular ap. mag.
193	j_flg_7	L	1hd	-	J confusion flag for 7 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
194	h_m_7	L	6.3f	mag	H 7 arcsec radius circular aperture magnitude.
195	h_msig_7	L	5.3f	mag	H 1-sigma uncertainty in 7 arcsec circular ap. mag.
196	h_flg_7	L	1hd	-	H confusion flag for 7 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
197	k_m_7	L	6.3f	mag	K 7 arcsec radius circular aperture magnitude.
198	k_msig_7	L	5.3f	mag	K 1-sigma uncertainty in 7 arcsec circular ap. mag.
199	k_flg_7	L	1hd	-	K confusion flag for 7 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
200	j_m_10	L	6.3f	mag	J 10 arcsec radius circular aperture magnitude.
201	j_msig_10	L	5.3f	mag	J 1-sigma uncertainty in 10 arcsec circular ap. mag.
202	j_flg_10	L	1hd	-	J confusion flag for 10 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
203	h_m_10	L	6.3f	mag	H 10 arcsec radius circular aperture magnitude.
204	h_msig_10	L	5.3f	mag	H 1-sigma uncertainty in 10 arcsec circular ap. mag.
205	h_flg_10	L	1hd	-	H confusion flag for 10 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
206	k_m_10	L	6.3f	mag	K 10 arcsec radius circular aperture magnitude.
207	k_msig_10	L	5.3f	mag	K 1-sigma uncertainty in 10 arcsec circular ap. mag.
208	k_flg_10	L	1hd	-	K confusion flag for 10 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
209	j_m_15	L	6.3f	mag	J 15 arcsec radius circular aperture magnitude.
210	j_msig_15	L	5.3f	mag	J 1-sigma uncertainty in 15 arcsec circular ap. mag.
211	j_flg_15	L	1hd	-	J confusion flag for 15 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
212	h_m_15	L	6.3f	mag	H 15 arcsec radius circular aperture magnitude.
213	h_msig_15	L	5.3f	mag	H 1-sigma uncertainty in 15 arcsec circular ap. mag.
214	h_flg_15	L	1hd	-	H confusion flag for 15 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
215	k_m_15	L	6.3f	mag	K 15 arcsec radius circular aperture magnitude.
216	k_msig_15	L	5.3f	mag	K 1-sigma uncertainty in 15 arcsec circular ap. mag.
217	k_flg_15	L	1hd	-	K confusion flag for 15 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
218	j_m_20	L	6.3f	mag	J 20 arcsec radius circular aperture magnitude.
219	j_msig_20	L	5.3f	mag	J 1-sigma uncertainty in 20 arcsec circular ap. mag.
220	j_flg_20	L	1hd	-	J confusion flag for 20 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
221	h_m_20	L	6.3f	mag	H 20 arcsec radius circular aperture magnitude.
222	h_msig_20	L	5.3f	mag	H 1-sigma uncertainty in 20 arcsec circular ap. mag.
223	h_flg_20	L	1hd	-	H confusion flag for 20 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
224	k_m_20	L	6.3f	mag	K 20 arcsec radius circular aperture magnitude.
225	k_msig_20	L	5.3f	mag	K 1-sigma uncertainty in 20 arcsec circular ap. mag.
226	k_flg_20	L	1hd	-	K confusion flag for 20 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
227	j_m_25	L	6.3f	mag	J 25 arcsec radius circular aperture magnitude.
228	j_msig_25	L	5.3f	mag	J 1-sigma uncertainty in 25 arcsec circular ap. mag.
229	j_flg_25	L	1hd	-	J confusion flag for 25 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
230	h_m_25	L	6.3f	mag	H 25 arcsec radius circular aperture magnitude.
231	h_msig_25	L	5.3f	mag	H 1-sigma uncertainty in 25 arcsec circular ap. mag.
232	h_flg_25	L	1hd	-	H confusion flag for 25 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
233	k_m_25	L	6.3f	mag	K 25 arcsec radius circular aperture magnitude.
234	k_msig_25	L	5.3f	mag	K 1-sigma uncertainty in 25 arcsec circular ap. mag.
235	k_flg_25	L	1hd	-	K confusion flag for 25 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
236	j_m_30	L	6.3f	mag	J 30 arcsec radius circular aperture magnitude.
237	j_msig_30	L	5.3f	mag	J 1-sigma uncertainty in 30 arcsec circular ap. mag.
238	j_flg_30	L	1hd	-	J confusion flag for 30 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
239	h_m_30	L	6.3f	mag	H 30 arcsec radius circular aperture magnitude.
240	h_msig_30	L	5.3f	mag	H 1-sigma uncertainty in 30 arcsec circular ap. mag.
241	h_flg_30	L	1hd	-	H confusion flag for 30 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
242	k_m_30	L	6.3f	mag	K 30 arcsec radius circular aperture magnitude.
243	k_msig_30	L	5.3f	mag	K 1-sigma uncertainty in 30 arcsec circular ap. mag.
244	k_flg_30	L	1hd	-	K confusion flag for 30 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
245	j_m_40	L	6.3f	mag	J 40 arcsec radius circular aperture magnitude.
246	j_msig_40	L	5.3f	mag	J 1-sigma uncertainty in 40 arcsec circular ap. mag.
247	j_flg_40	L	1hd	-	J confusion flag for 40 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
248	h_m_40	L	6.3f	mag	H 40 arcsec radius circular aperture magnitude.
249	h_msig_40	L	5.3f	mag	H 1-sigma uncertainty in 40 arcsec circular ap. mag.
250	h_flg_40	L	1hd	-	H confusion flag for 40 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
251	k_m_40	L	6.3f	mag	K 40 arcsec radius circular aperture magnitude.
252	k_msig_40	L	5.3f	mag	K 1-sigma uncertainty in 40 arcsec circular ap. mag.
253	k_flg_40	L	1hd	-	K confusion flag for 40 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
254	j_m_50	L	6.3f	mag	J 50 arcsec radius circular aperture magnitude.
255	j_msig_50	L	5.3f	mag	J 1-sigma uncertainty in 50 arcsec circular ap. mag.
256	j_flg_50	L	1hd	-	J confusion flag for 50 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
257	h_m_50	L	6.3f	mag	H 50 arcsec radius circular aperture magnitude.
258	h_msig_50	L	5.3f	mag	H 1-sigma uncertainty in 50 arcsec circular ap. mag.
259	h_flg_50	L	1hd	-	H confusion flag for 50 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
260	k_m_50	L	6.3f	mag	K 50 arcsec radius circular aperture magnitude.
261	k_msig_50	L	5.3f	mag	K 1-sigma uncertainty in 50 arcsec circular ap. mag.
262	k_flg_50	L	1hd	-	K confusion flag for 50 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
263	j_m_60	L	6.3f	mag	J 60 arcsec radius circular aperture magnitude.
264	j_msig_60	L	5.3f	mag	J 1-sigma uncertainty in 60 arcsec circular ap. mag.
265	j_flg_60	L	1hd	-	J confusion flag for 60 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
266	h_m_60	L	6.3f	mag	H 60 arcsec radius circular aperture magnitude.
267	h_msig_60	L	5.3f	mag	H 1-sigma uncertainty in 60 arcsec circular ap. mag.
268	h_flg_60	L	1hd	-	H confusion flag for 60 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
269	k_m_60	L	6.3f	mag	K 60 arcsec radius circular aperture magnitude.
270	k_msig_60	L	5.3f	mag	K 1-sigma uncertainty in 60 arcsec circular ap. mag.
271	k_flg_60	L	1hd	-	K confusion flag for 60 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
272	j_m_70	L	6.3f	mag	J 70 arcsec radius circular aperture magnitude.
273	j_msig_70	L	5.3f	mag	J 1-sigma uncertainty in 70 arcsec circular ap. mag.
274	j_flg_70	L	1hd	-	J confusion flag for 70 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
275	h_m_70	L	6.3f	mag	H 70 arcsec radius circular aperture magnitude.
276	h_msig_70	L	5.3f	mag	H 1-sigma uncertainty in 70 arcsec circular ap. mag.
277	h_flg_70	L	1hd	-	H confusion flag for 70 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
278	k_m_70	L	6.3f	mag	K 70 arcsec radius circular aperture magnitude.
279	k_msig_70	L	5.3f	mag	K 1-sigma uncertainty in 70 arcsec circular ap. mag.
280	k_flg_70	L	1hd	-	K confusion flag for 70 arcsec circular ap. mag. The confusion flags [jhk]_flg for each mag are defined as follows: 0 if no other sources within aperture used 1 if ap contained pixels masked off in coadd 2 if ap contained pixels masked off due to neighboring sources 3 if ap contained pixels that had a point source flux subtracted off 4 if ap contained pixels within bright star mask 5 if ap contained pixels masked off due to persistence 6 if aperture ran into coadd boundary 7 if ap contained pixels within bright galaxy mask 9 if integrated flux is negative If the integrated flux is negative, a mag value is calculated using BFMag = 99.0 - [ZERO_CAL - 2.5 log10(\|flux\|)]; the resulting mag range is between ~ 75 and 99.
---	System photometry
281	j_m_sys	L	6.3f	mag	J system photometry magnitude. The system flux includes the flux from this extended source and anything else in the immediate area, including stars and neighboring galaxies that "touch" this source.
282	j_msig_sys	L	5.3f	mag	J 1-sigma uncertainty in system photometry mag.
283	h_m_sys	L	6.3f	mag	H system photometry magnitude. The system flux includes the flux from this extended source and anything else in the immediate area, including stars and neighboring galaxies that "touch" this source.
284	h_msig_sys	L	5.3f	mag	H 1-sigma uncertainty in system photometry mag.
285	k_m_sys	L	6.3f	mag	K system photometry magnitude. The system flux includes the flux from this extended source and anything else in the immediate area, including stars and neighboring galaxies that "touch" this source.
286	k_msig_sys	L	5.3f	mag	K 1-sigma uncertainty in system photometry mag.
287	sys_flg	L	1hd	-	system flag: 0=no system, 1=nearby galaxy flux incl. in mag.
288	contam_flg	L	1hd	-	contamination flag: 0=no stars, 1=stellar flux incl. in mag.
---	5-sigma area ratios
289	j_5sig_ba	L	5.3f	-	J minor/major axis ratio fit to the 5-sigma isophote.
290	j_5sig_phi	L	3hd	deg	J angle to 5-sigma major axis (E of N).
291	h_5sig_ba	L	5.3f	-	H minor/major axis ratio fit to the 5-sigma isophote.
292	h_5sig_phi	L	3hd	deg	H angle to 5-sigma major axis (E of N).
293	k_5sig_ba	L	5.3f	-	K minor/major axis ratio fit to the 5-sigma isophote.
294	k_5sig_phi	L	3hd	deg	K angle to 5-sigma major axis (E of N).
---	5-sigma to 3-sigma area
295	j_d_area	L	3hd	-	J 5-sigma to 3-sigma differential area.
296	j_perc_darea	L	3hd	-	J 5-sigma to 3-sigma percent area change.
297	h_d_area	L	3hd	-	H 5-sigma to 3-sigma differential area.
298	h_perc_darea	L	3hd	-	H 5-sigma to 3-sigma percent area change.
299	k_d_area	L	3hd	-	K 5-sigma to 3-sigma differential area.
300	k_perc_darea	L	3hd	-	K 5-sigma to 3-sigma percent area change.
---	Bi-symmetric quantities
301	j_bisym_rat	L	5.3f	-	J bi-symmetric flux ratio.
302	j_bisym_chi	L	6.3f	-	J bi-symmetric cross-correlation chi.
303	h_bisym_rat	L	5.3f	-	H bi-symmetric flux ratio.
304	h_bisym_chi	L	6.3f	-	H bi-symmetric cross-correlation chi.
305	k_bisym_rat	L	5.3f	-	K bi-symmetric flux ratio.
306	k_bisym_chi	L	6.3f	-	K bi-symmetric cross-correlation chi.
---	Parameters for extended src discrimination from point srcs
307	j_sh0	L	5.2f	-	J ridge shape (LCSB: BSNR limit).
308	j_sig_sh0	L	5.2f	-	J ridge shape sigma (LCSB: B2SNR limit).
309	h_sh0	L	5.2f	-	H ridge shape (LCSB: BSNR limit).
310	h_sig_sh0	L	5.2f	-	H ridge shape sigma (LCSB: B2SNR limit).
311	k_sh0	L	5.2f	-	K ridge shape (LCSB: BSNR limit).
312	k_sig_sh0	L	5.2f	-	K ridge shape sigma (LCSB: B2SNR limit).
313	j_sc_mxdn	L	6.1f	-	J mxdn (score) (LCSB: BSNR - block/smoothed SNR).
314	j_sc_sh	L	6.1f	-	J shape (score).
315	j_sc_wsh	L	6.1f	-	J wsh (score) (LCSB: PSNR - peak raw SNR).
316	j_sc_r23	L	6.1f	-	J r23 (score) (LCSB: TSNR - integrated SNR for r=15).
317	j_sc_1mm	L	6.1f	-	J 1st moment (score) (LCSB: super blk 2,4,8 SNR).
318	j_sc_2mm	L	6.1f	-	J 2nd moment (score) (LCSB: SNRMAX - super SNR max).
319	j_sc_vint	L	6.1f	-	J vint (score).
320	j_sc_r1	L	6.1f	-	J r1 (score).
321	j_sc_msh	L	6.1f	-	J median shape score.
322	h_sc_mxdn	L	6.1f	-	H mxdn (score) (LCSB: BSNR - block/smoothed SNR).
323	h_sc_sh	L	6.1f	-	H shape (score).
324	h_sc_wsh	L	6.1f	-	H wsh (score) (LCSB: PSNR - peak raw SNR).
325	h_sc_r23	L	6.1f	-	H r23 (score) (LCSB: TSNR - integrated SNR for r=15).
326	h_sc_1mm	L	6.1f	-	H 1st moment (score) (LCSB: super blk 2,4,8 SNR).
327	h_sc_2mm	L	6.1f	-	H 2nd moment (score) (LCSB: SNRMAX - super SNR max).
328	h_sc_vint	L	6.1f	-	H vint (score).
329	h_sc_r1	L	6.1f	-	H r1 (score).
330	h_sc_msh	L	6.1f	-	H median shape score.
331	k_sc_mxdn	L	6.1f	-	K mxdn (score) (LCSB: BSNR - block/smoothed SNR).
332	k_sc_sh	L	6.1f	-	K shape (score).
333	k_sc_wsh	L	6.1f	-	K wsh (score) (LCSB: PSNR - peak raw SNR).
334	k_sc_r23	L	6.1f	-	K r23 (score) (LCSB: TSNR - integrated SNR for r=15).
335	k_sc_1mm	L	6.1f	-	K 1st moment (score) (LCSB: super blk 2,4,8 SNR).
336	k_sc_2mm	L	6.1f	-	K 2nd moment (score) (LCSB: SNRMAX - super SNR max).
337	k_sc_vint	L	6.1f	-	K vint (score).
338	k_sc_r1	L	6.1f	-	K r1 (score).
339	k_sc_msh	L	6.1f	-	K median shape score.
340	j_chif_ellf	L	6.1f	-	J % chi-fraction for elliptical fit to 3-sig isophote.
341	k_chif_ellf	L	6.1f	-	K % chi-fraction for elliptical fit to 3-sig isophote.
342	ellfit_flg	L	1hd	-	ellipse fitting contamination flag.
343	sup_chif_ellf	L	6.1f	-	super-coadd % chi-fraction for ellip. fit to 3-sig isophote.
---	Coadd background, brightness
344	n_blank	L	4hd	-	number of blanked source records. These parameters refer to sources that were blanked and/or subtracted from the images before doing photometry. Data for each of these blanked or subtracted sources are found in the blanked and subtracted source tables.
345	n_sub	L	4hd	-	number of subtracted source records. These parameters refer to sources that were blanked and/or subtracted from the images before doing photometry. Data for each of these blanked or subtracted sources are found in the blanked and subtracted source tables.
346	bl_sub_flg	L	1hd	-	blanked/subtracted src description flag.
---	Other miscellaneous parameters
347	id_flg	L	1hd	-	type/galaxy ID flag (0=non-catalog, 1=catalog, 2=LCSB). This flag indicates the extended source catalog type as follows: 0 = extended source not found in another catalog 1 = extended source is found in galaxy catalog (ID found in id_cat field) 2 = LCSB (Low Central Surface Brightness) source
348	id_cat	L	20s	-	matched galaxy's catalog name.
349	fg_flg	L	6s	-	flux-growth convergence flag.
350	blk_fac	L	1hd	-	LCSB blocking factor (1, 2, 4, 8).
351	dup_src	L	1hd	-	Duplicate source flag. Used in conjunction with the use_src flag, this numerical flag indicates whether the source falls in a Tile overlap region, and if so, if it was detected multiple times. "0" = The source does not fall within a Tile overlap region (use_src="1"), or it falls in an overlap region and there were no sources detected within 2" of its position in the overlapping Tile (use_src="0"). "1" = The source falls within a Tile overlap region, and there is one source detected within 2" of its position in the overlapping Tile. ">1" = The source falls within a Tile overlap region, and there are multiple sources detected within 2" of its position in the overlapping Tile, and/or within its own Tile. This implies confusion in the multiple source resolution procedure.
352	use_src	L	1hd	-	Use source flag. Used in conjunction with the dup_src flag, this numerical flag indicates if a source falls within a Tile overlap region, and whether or not it satisfies the unbiased selection rules for multiple source resolution. "1" = The source does not fall in a Tile overlap region (dup_src="0"), or it falls in an overlap region, but lies farther from its scan edge than any apparition of the source in another Tile. A source must have use_src="1" to be considered part of the sub-Catalog that satisfies the 2MASS Level 1 Science Requirements "0" = The source falls in a Tile overlap region, but does not have a detection within 2" of its position in any overlapping Tiles. PSC sources with use_src="0" will always have dup_src="0". Such objects are usually faint, and thus toggling above and below the detection limits, or may have moved between the scans of the different Tiles. ">1" = The source falls within a Tile overlap region, and there are multiple sources detected within 2" of its position in the overlapping Tile, and/or within its own Tile. This implies confusion in the multiple source resolution procedure.
353	prox	L	5.1f	arcsec	Proximity. The distance between this source and its nearest neighbor in the PSC. The pts_key of the nearest source is given in the pxcntr column. The effective resolution of the 2MASS system is approximately 5". Any source with prox < 6" is potentially confused with a nearby object, and should be used with caution.
354	pxpa	L	3hd	deg	The position angle on the sky of the vector from the source to the nearest neighbor in the PSC, in degrees East of North. This column in null if prox=0.0, which occurs only for confused sources or from errors in the bandmerge process caused by confusion.
355	pxcntr	L	10d	-	ext_key value of nearest XSC source.
356	dist_edge_ns	L	%5d	arcsec	The distance from the source to the nearest North or South scan edge. The scan edge is defined by the great-circle interpolation between the 3-band coverage corners. The equatorial coordinates of the 3-band coverage corners are given in the Scan Information Table, referenced by the scan_key. The first character of the dist_edge_flg indicates to which edge the source is closer.
357	dist_edge_ew	L	%3d	arcsec	The distance from the source to the nearest East or West scan edge. The scan edge is defined by the great-circle interpolation between the 3-band coverage corners. The equatorial coordinates of the 3-band coverage corners are given in the Scan Information Table, referenced by the scan_key. The second character of the dist_edge_flg indicates to which edge the source is closer.
358	dist_edge_flg	L	%2s	-	flag indicating which edges ([n\|s][e\|w]) are nearest to src.
359	pts_key	L	10d	-	key to point source data DB record. If the source has point source data (i.e. it is not an LCSB), this field will be set to the key of the record in the point source table containing the point source data. The point source data will also have the same date, hemisphere, scan, id keys.
360	mp_key	L	5d	-	key to minor planet prediction DB record. If a minor planet (asteroid) is predicted at this src's position, the field is set to the key of the record containing the minor planet prediction data (see the minor planet tbls). The minor planet data will also have the same date, hemisphere, scan, id keys.
361	night_key	L	4d	-	key to night data record in "scan DB". This field is set to the key of the record containing the corresponding night data in the night data table. The records will also have the same date and hemisphere keys.
362	scan_key	S	6d	-	key to scan data record in "scan DB". This field is set to the key of the record containing the corresponding scan data in the scan data table. The records will also have the same date, hemisphere, scan keys.
363	coadd_key	L	7d	-	key to coadd data record in "scan DB". This field is set to the key of the record containing the corresponding J, H, and K band coadd data in the coadd data table. The records will also have the same date, hemisphere, scan, coadd keys.
364	hemis	L	1s	-	hemisphere (N/S) of observation. "n" = North/Mt. Hopkins; "s" = South/CTIO.
365	date	L	yyyy-mm-dd	-	The observation reference date for this source expressed in ISO standard format. This is the UT day value at sunrise for the night on which the source was observed. Because it is possible for the UT day to change during a night of observations, the actual UT date for a source measurement can differ from date by one day. Use the Julian Day value (jdate) for a more accurate determination of the observation time of the source.
366	scan	L	3hd	-	scan number (unique within date).
367	coadd	L	03hd	-	3-digit coadd number (unique within scan).
368	id	L	6d	-	source ID number (unique within scan, coadd).
369	x_coadd	L	6.1f	arcsec	x (cross-scan) position (coadd coord.).
370	y_coadd	L	6.1f	arcsec	y (in-scan) position (coadd coord.).
371	j_subst2	L	6.1f	-	J residual background #2 (score).
372	h_subst2	L	6.1f	-	H residual background #2 (score).
373	k_subst2	L	6.1f	-	K residual background #2 (score).
374	j_back	L	6.1f	-	J coadd median background.
375	h_back	L	6.1f	-	H coadd median background.
376	k_back	L	6.1f	-	K coadd median background.
377	j_resid_ann	L	7.3f	DN	J residual annulus background median.
378	h_resid_ann	L	7.3f	DN	H residual annulus background median.
379	k_resid_ann	L	7.3f	DN	K residual annulus background median.
380	j_bndg_per	L	5d	arcsec	J banding Fourier Transf. period on this side of coadd.
381	j_bndg_amp	L	6.3f	DN	J banding maximum FT amplitude on this side of coadd.
382	h_bndg_per	L	5d	arcsec	H banding Fourier Transf. period on this side of coadd.
383	h_bndg_amp	L	6.3f	DN	H banding maximum FT amplitude on this side of coadd.
384	k_bndg_per	L	5d	arcsec	K banding Fourier Transf. period on this side of coadd.
385	k_bndg_amp	L	6.3f	DN	K banding maximum FT amplitude on this side of coadd.
386	j_seetrack	L	4.1f	-	J band seetracking score.
387	h_seetrack	L	4.1f	-	H band seetracking score.
388	k_seetrack	L	4.1f	-	K band seetracking score.
389	ext_key	S	9d	-	entry counter (key) number (unique within table).

Query Catalog