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VizieR

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I/254/out The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)
The Full Catalogue (25241730 positions) (25241730 rows)
  GSC=0242201203
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Note: The Guide Star Catalog has been constructed to support the operational need of the Hubble Space Telescope. It contains over 25 million positions for about 19 million objects, of which more than 15 million are classified as stars. The version 1.2 is a new astrometric reduction which results in absolute position errors about 0.3-0.4 arcsec. (see GSC pages at URL http://www-gsss.stsci.edu/gsc/gsc.html)

ColumnValue  Explain   (UCD)
_RAJ200006 32 02.95 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data) (pos.eq.ra)
_DEJ2000+30 04 51.8 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data) (pos.eq.dec)
_RAB195006 28 50.83 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data) (pos.eq.ra)
_DEB1950+30 07 04.5 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data) (pos.eq.dec)
_Glon183.8564 deg Galactic longitude (computed by VizieR, not part of the original data) (pos.galactic.lon)
_Glat+09.4087 deg Galactic latitude (computed by VizieR, not part of the original data) (pos.galactic.lat)

GSC0242201203  GSC designation (Note)   (meta.id;meta.main)
RAJ2000098.01230 deg Right ascension in J2000, epoch of plate (pos.eq.ra;meta.main)
DEJ2000+30.08106 deg Declination in J2000, epoch of plate (pos.eq.dec;meta.main)
PosErr 0.2 arcsec Mean error on position (stat.error)
Pmag12.27 mag photographic magnitude (see n_Pmag) (phot.mag;em.opt)
e_Pmag 0.34 mag Mean error on photographic magnitude (stat.error;phot.mag;em.opt.U)
n_Pmag 1   [0,18] Coded passband for magnitude (Note)   (meta.note)
Class0   [0,3] Class of object (0=star; 3=non-stellar) (src.class)
Plate000C  Plate designation (Note)   (obs.field)
Epoch1983.036 yr Epoch of plate (Note)   (time.epoch)
MultF   [TF] True if multiple object / False otherwise (meta.code.multip)

VersionsGSC-all  Get parameters of that star from all GSC versions (meta.ref.url)
  
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