Note: USNO-A1.0 contains 488,006,860 sources, and was compiled from the blue/red overlaps of the detection lists generated from scans of POSS-I O and E plates (>=-30°) and SRC-J and ESO-R plates (<=-35°). USNO-A1.0 was created by Dave Monet () and collaborators at Flagstaff Station, U.S. Naval Observatory; it is superseded by the new PMM-USNO-A2.0 version.
The VizieR search engine uses an on-line compressed version (3.4Gbytes) which was generated at CDS.

I/243/out Post annotation

The PMM USNO-A1.0 Catalogue (Monet 1997) ReadMe+ftp metaI/243/out The Full Catalogue (488006860 rows) (Note)

Full	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	_RAB1950 "h:m:s"	_DEB1950 "d:m:s"	_Glon deg	_Glat deg	USNO-A1.0	RA(ICRS) deg	DE(ICRS) deg	GSCflag	Mflag	Bmag mag	Rmag mag	Epoch yr
1	21 33 43.64472	+51 07 24.4524	21 31 59.27126	+50 54 02.0982	94.45753423	-0.47738513	1350-14702073	323.431853	51.123459			15.8	14.6	1952.705