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 The USNO-A2.0 Catalogue (Monet+ 1998)
Post annotation
1.I/252/outThe Full Catalogue (Note) (526280881 rows)
USNO-A2.0 contains 526,280,881 sources, and is based on a re-reduction of the Precision Measuring Machine (PMM) scans from POSS-I O and E plates (>=-18°) and SRC-J and ESO-R plates (<=-20°). USNO-A2.0 was created by Dave Monet () and collaborators at Flagstaff Station, U.S. Naval Observatory.
The major difference between USNO-A2.0 and its previous version USNO-A1.0 is that A1.0 used the Guide Star Catalog as its reference frame whereas A2.0 uses the ICRF as realized by the USNO ACT catalog (Urban et al. 1997). The VizieR search engine uses an on-line compressed version (3.6Gbytes) which was generated at CDS.

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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