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  The HST Guide Star Catalog, Version GSC-ACT (Lasker+ 1996-99)
Post annotation
1.I/255/outThe GSC-ACT Full Catalogue (25241730 positions) (25241730 rows)
The GSC-ACT (or GSC1.3) is a recalibration of the GSC1.1, the catalogue constructed to support the operational need of the Hubble Space Telescope, with the ACT, the combination of the Astrographic Catalogue and the Tycho catalogue derived from the Hipparcos mission; see for more details about this recalibration.

Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  GSC  (i) GSC designation (Note)   (;meta.main)
  RAJ2000 deg (i) Right ascension in J2000, epoch of plate (pos.eq.ra;meta.main)
  DEJ2000 deg (i) Declination in J2000, epoch of plate (pos.eq.dec;meta.main)
  PosErr arcsec Mean error on position (stat.error)
  Pmag mag (i) photographic magnitude (see n_Pmag) (phot.mag;em.opt)
  e_Pmag mag Mean error on photographic magnitude (stat.error;phot.mag;em.opt.U)
  n_Pmag   [0,18] Coded passband for magnitude (Note)   (meta.note)
  Class   [0,3] Class of object (0=star; 3=non-stellar) (src.class)
  Plate (char) Plate designation (Note)   (obs.field)
  Epoch yr (n) Epoch of plate (Note)   (time.epoch)
  Mult (char) [TF] True if multiple object / False otherwise (meta.code.multip)
  Versions  Get parameters of that star from all GSC versions (meta.ref.url)

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