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 The USNO-A2.0 Catalogue (Monet+ 1998)
Post annotation
1.I/252/outThe Full Catalogue (Note) (526280881 rows)

Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  USNO-A2.0 (char) Original designation in USNO-A2.0 catalogue (Note)   (;meta.main)
  RAJ2000 deg Right ascension (ICRS) mean of blue/red plates (pos.eq.ra;meta.main)
  DEJ2000 deg Declination (ICRS) mean of blue/red plates (pos.eq.dec;meta.main)
  ACTflag (char) [A] 'A' when star belongs to ACT (Cat. I/246) (meta.code)
  Mflag (char) [*] '*' magnitudes are probably wrong (meta.code)
  Bmag mag Magnitude from blue plate (phot.mag;em.opt.B)
  Rmag mag Magnitude from red plate (phot.mag;em.opt.R)
  Epoch yr (n) Mean epoch of position (Note)   (time.epoch)

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