VizieR

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I/252/out

The USNO-A2.0 Catalogue (Monet+ 1998)

The Full Catalogue (526280881 rows)

USNO-A2.0===1125-00808140

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.

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*Column*	*Value*		*Explain (UCD)*
_RAJ2000	02 31 41.11608	"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) (POS_EQ_RA)
_DEJ2000	+22 53 39.6420	"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) (POS_EQ_DEC)
_RAB1950	02 28 50.25297	"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) (POS_EQ_RA)
_DEB1950	+22 40 25.4594	"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) (POS_EQ_DEC)
_Glon	151.16541620	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) (POS_GAL_LON)
_Glat	-34.42276936	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) (POS_GAL_LAT)

USNO_A2_0	1125-00808140		⁽ⁱ⁾ Original designation in USNO-A2.0 catalogue (Note) (meta.id;meta.main) (ID_MAIN)
RAJ2000	037.921317	deg	⁽ⁱ⁾ Right ascension (ICRS) mean of blue/red plates (pos.eq.ra;meta.main) (POS_EQ_RA_MAIN)
DEJ2000	+22.894345	deg	⁽ⁱ⁾ Declination (ICRS) mean of blue/red plates (pos.eq.dec;meta.main) (POS_EQ_DEC_MAIN)
ACTflag			[A] 'A' when star belongs to ACT (Cat. I/246) (meta.code) (CODE_MISC)
Mflag			[] '' magnitudes are probably wrong (meta.code) (CODE_MISC)
Bmag	17.4	mag	Magnitude from blue plate (phot.mag;em.opt.B) (PHOT_PHG_B)
Rmag	16.3	mag	Magnitude from red plate (phot.mag;em.opt.R) (PHOT_PHG_R)
Epoch	1950.936	yr	Mean epoch of position (Note) (time.epoch) (TIME_EPOCH)

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