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I/252/out The USNO-A2.0 Catalogue (Monet+ 1998)
The Full Catalogue (526280881 rows)
  USNO-A2.0===1275-11329122
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Note: 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.

ColumnValue  Explain   (UCD)
_RAJ200019 24 36.469 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data) (pos.eq.ra)
_DEJ2000+43 40 47.51 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data) (pos.eq.dec)
_RAB195019 23 02.141 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data) (pos.eq.ra)
_DEB1950+43 34 49.16 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data) (pos.eq.dec)
_Glon075.7110 deg Galactic longitude (computed by VizieR, not part of the original data) (pos.galactic.lon)
_Glat+12.8315 deg Galactic latitude (computed by VizieR, not part of the original data) (pos.galactic.lat)

USNO_A2_01275-11329122  (i) Original designation in USNO-A2.0 catalogue (Note)   (meta.id;meta.main)
RAJ2000291.151956 deg (i) Right ascension (ICRS) mean of blue/red plates (pos.eq.ra;meta.main)
DEJ2000+43.679864 deg (i) Declination (ICRS) mean of blue/red plates (pos.eq.dec;meta.main)
ACTflag    [A] 'A' when star belongs to ACT (Cat. I/246) (meta.code)
Mflag    [*] '*' magnitudes are probably wrong (meta.code)
Bmag13.8 mag Magnitude from blue plate (phot.mag;em.opt.B)
Rmag13.8 mag Magnitude from red plate (phot.mag;em.opt.R)
Epoch1951.520 yr Mean epoch of position (Note)   (time.epoch)
  
elapse time 0

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