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.

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	USNO-A2.0	RAJ2000 deg	DEJ2000 deg	ACTflag	Mflag	Bmag mag	Rmag mag	Epoch yr
1	12.529	04 43 52.86744	-09 42 24.3900	0750-01082183	070.970281	-09.706775			17.2	16.0	1953.866

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.2	RA(ICRS) deg	DE(ICRS) deg	Epoch yr	Rmag mag	e_ mag	Bjmag mag	e_ mag	Class	a pix	e
1	5.997	04 43 53.19888	-09 42 06.5340	S02323036939	070.971662	-09.701815	1990.893	16.62	0.43	16.74	0.32	3	8.32	0.50
2	12.135	04 43 52.89000	-09 42 24.0768	S02323036879	070.970375	-09.706688	1990.893	16.37	0.43	17.63	0.32	0	3.43	0.07

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Full	_r [****ClosingBrace(s)Inserted****]
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