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  I/254
The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)   Footprint-I/254(gal)
1.I/254/out The Full Catalogue (25241730 positions) (25241730 rows)
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)
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  Query by Position on the Sky  (Adapt Form to use a List of targets)
Target Name (resolved by Simbad) or Position:

Position in Sexagesimal, or Decimal °
Target dimension:

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  Output preferences for Position:
  rx,yPositionGalactic  J2000    B1950  Ecl.J2000  none
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r and x,y are the distance to the Target;
Position is in the same coordinate system as Target.
  Query by Constraints applied on Columns
ShowSortColumn  Constraint Explain   (UCD)
  GSC  GSC designation (Note)   (meta.id;meta.main)   (ID_MAIN)
  RAJ2000 deg Right ascension in J2000, epoch of plate   (pos.eq.ra;meta.main)   (POS_EQ_RA_MAIN)
  DEJ2000 deg Declination in J2000, epoch of plate   (pos.eq.dec;meta.main)   (POS_EQ_DEC_MAIN)
  PosErr arcsec Mean error on position   (stat.error)   (ERROR)
  Pmag mag photographic magnitude (see n_Pmag)   (phot.mag;em.opt)   (PHOT_PHG_MAG)
  e_Pmag mag Mean error on photographic magnitude   (stat.error;phot.mag;em.opt.U)   (ERROR)
  n_Pmag   [0,18] Coded passband for magnitude (Note)   (meta.note)   (NOTE)
  Class   [0,3] Class of object (0=star; 3=non-stellar)   (src.class)   (CLASS_OBJECT)
  Plate (char) Plate designation (Note)   (obs.field)   (ID_PLATE)
  Epoch yr (n) Epoch of plate (Note)   (time.epoch)   (TIME_EPOCH)
  Mult (char) [TF] True if multiple object / False otherwise   (meta.code.multip)   (CODE_MULT_INDEX)
  Versions  Get parameters of that star from all GSC versions   (meta.ref.url)   (DATA_LINK)

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