VizieR

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VizieR

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I/252/out The USNO-A2.0 Catalogue (Monet+ 1998)
The Full Catalogue (526280881 rows)
  USNO-A2.0===0750-08077757
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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)
_RAJ200013 15 17.22000 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEJ2000-13 34 05.3220 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_RAB195013 12 38.38854 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEB1950-13 18 14.9669 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_Glon311.76662428 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat+48.89406851 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)

USNO_A2_00750-08077757  (i) Original designation in USNO-A2.0 catalogue (Note)   (meta.id;meta.main)
RAJ2000198.821750 deg (i) Right ascension (ICRS) mean of blue/red plates (pos.eq.ra;meta.main)
DEJ2000-13.568145 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)
Bmag19.6 mag Magnitude from blue plate (phot.mag;em.opt.B)
Rmag19.1 mag Magnitude from red plate (phot.mag;em.opt.R)
Epoch1954.389 yr Mean epoch of position (Note)   (time.epoch)
  
elapse time 1

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Rules of usage of VizieR data

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