DR12

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ObjId
Ra,dec
5-part SDSS
Plate-MJD-Fiber

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By clicking on the different tabs at the gutter, you can search for individual objects based on
different criteria.

    objId
    is a 64 bit long hex number, composed of the rerun, run, camcol, field, obj
    Ra,dec
    is a position on the sky, expressed in decimal degrees. A search radius of 0.75 arcmins
    is used. The nearest primary object in the SDSS is returned.
    SpecObjId
    is a 64 bit long number, composed of a plate, its mjd, and the fiber number.
    5-part SDSS
    is a long string, composed of run-rerun-camcol-field-obj, separated by a hyphen as shown.