Title: Photometric analysis of asteroids in the Phocaea region

Abstract: 
The Phocaea asteroid family, one of the large ancient families located in the inner main belt, may be the sources of near-Earth asteroids (NEAs) due to the nearby 3:1 mean motion resonance with Jupiter, the v6 secular resonance, and the Yarkovsky and YORP effects. Thus, understanding the influence of the Yarkovsky and YORP effects on the Phocaea family is one of the keys to figuring out the source of NEAs. However, the physical properties of most of the Phocaea family members are unknown at present. We perform a photometric analysis for 44 asteroids in the Phocaea region using photometric data obtained by ground-based and space-based telescopes (i.e., TESS and Gaia). Based on the derived physical properties, we find significant footprints of the Yarkovsky and YORP effects on the Phocaea family members. Selecting five asteroids nearby the inside boundary of the V-shape in the absolute-magnitude semimajor-axis (H,a) space, we estimate their densities considering their migration in semimajor-axis arises from the Yarkovsky effect. The bulk density of (852) Wladilena (3.55 g/cm3) suggests a link to the H chondrite meteorites. Incorporating the grain density of the H chondrites, we estimate the macroporosities of the asteroids (290) Bruna, (1164) Kobolda, and (587) Hypsipyle, respectively 41%, 47%, and 65%, implying rubble pile structures. Considering the H chondrites link to asteroid (25) Phocaea, we suggest the parent body of the Phocaea family has been composed of H chondrite like material and the Phocaea family may be one of the sources of H chondrite meteorites.

Description: This dataset provied results of lightcurves for all 44 asteroids in the Phocaea region, including their observed and model lightcurves, spin parameter, phase function parameter, and shape files. The above results for each asteroid are stored in a separate folder, which includes the best-fit solution (named model_01) and possible mirror solution (named model_02) if available.
 
File Summary:

lc.txt: photometric data of asteroid, the following are the detail contain of the lc.txt. 

	The first line gives the total number of light curves, 
        Individual light curves begin with the number of data and the data flag( '0' means relative magnitude, while '1' means absolute magnitude).
 	Then follow block contains the photometric data and related observational information. the 1th and 2th column are  the light-time corrected observation time in JD and brightness in intensity (reduced to 1AU distance of asteroid to the Earth and the Sun),3-5 columns present the cartesian coordinates of the Sun and of the observer with AU unit in the asteroid-center ecliptic frame.


lc_info.csv: This file contains observational information for each asteroid, including the start time of each lightcurve (UT), 
	time span (in days), number of photometric data and contributors, as well as the asteroid's heliocentric distance, geocentric distance (AU), and phase angle (deg) at the time of observation.


shp.obj: This file is a 3D shape model of an asteroid, stored in the standard Wavefront .obj format.
	

spin.txt: This file contains the spin parameters of the asteroid model.
        sidereal rotation period and its uncertainty; 
	longitude  of the spin pole and its uncertainties;
        latitude of the spin pole and their uncertainties; 
        the initial rotational phase and its uncertainty; 
        the observation time (MJD) corresponding to the initial rotational phase.

phf.txt: This file contains phase function parameters of the asteroid, 
         The absolute magnitude in the G band (H_G) and its uncertainty, 
	 The values of the parameters G1 and G2 and their uncertainties, 
         The value of the phase integral q and  its uncertainty, 
	 The value of the slope parameter beta_ref (in mag/rad) and its uncertainty.


Byte-by-byte Description of file: spin.txt
----------------------------------------------------------------------
Line  Format   Units   Label         Explanations
----------------------------------------------------------------------
1     F12.7    h       P            	 Sidereal rotation period
       F12.7   h       e_P           	Uncertainty of rotation period
2     F6.1     deg     lambda       Longitude of spin pole 
       F6.1    deg     e_lambda     Uncertainty of ecliptic longitude
3     F6.1     deg     beta         	Latitude of spin pole 
       F6.1    deg     e_beta       	Uncertainty of ecliptic latitude
4     F6.1     deg     phase_0        Initial rotational phase
       F6.1    deg     e_phase_0     Uncertainty of Initial rotational phase
5     F6.2     d       epoch_mjd     Initial observation time (MJD epoch)


Byte-by-byte Description of file: phf.txt
----------------------------------------------------------------------
Line  Format   Units      Label         Explanations
----------------------------------------------------------------------
1     F4.2     mag        H_G           Absolute magnitude in G band
       F4.2     mag        e_H_G         Uncertainty of H_G
2     F4.2     ---        G1            Slope parameter G1 in the H¨CG1¨CG2  system
       F4.2     ---        e_G1          Uncertainty of G1
3     F4.2     ---        G2            Slope parameter G2 in the H¨CG1¨CG2  system
       F4.2     ---        e_G2          Uncertainty of G2
4     F4.2     ---        q             Phase integral computed from G1, G2 parameters
       F4.2     ---        e_q           Uncertainty of phase integral q
5     F4.2     mag/rad    beta_ref      Slope parameter of the mean-magnitude reference phase curve
       F4.2     mag/rad    e_beta_ref    Uncertainty of beta_ref

