The 3 columns in color are computed by VizieR, and are not part of the original data.

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	2.448	00 31 04.35000	+23 57 09.6516	1125-00189540	007.768125	+23.952681			17.5	17.6	1954.663

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	APM-ID	RAJ2000 deg	DEJ2000 deg	rmag mag	l_	rClass	rStel	rDiam arcsec	rEll	bmag mag	l_	bClass	bStel	bDiam arcsec	b-r mag	Mflag
1	2.286	00 31 04.35600	+23 57 09.5112	EO1188-0174522	007.768150	+23.952642	17.51		1	18.33	10.1	0.16	18.96		1	7.81	10.4	1.45
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Note: The construction of the GSC-II is still in progress: this version has no proper motions, and the magnitude limits are 18.5 in F (red) and 19.5 in J (blue). The data are copyrighted, check the data use Policy.

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	2.090	00 31 04.37976	+23 57 09.4320	N32211231088	007.768249	+23.952620	1989.891	17.26	0.42	18.46	0.41	3	4.44	0.17

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	USNO-B1.0	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 mas	e_DEJ2000 mas	Epoch yr	pmRA mas/yr	pmDE mas/yr	Ndet	B1mag mag	R1mag mag	B2mag mag	R2mag mag	Imag mag
1	0.737	00 31 04.41144	+23 57 08.1504	1139-0006231	007.768381	+23.952264	923	779	1976.7	0	0	2	19.88			19.65
2	1.399	00 31 04.34808	+23 57 08.3232	1139-0006230	007.768117	+23.952312	95	999	1996.3	0	0	2				19.57	17.72
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%201.399&%3cFONT%20COLOR=%27#CD5B45%27>00%2031%2004.34808&%3cFONT%20COLOR=%27#CD5B45%27>%2b23%2057%2008.3232&1139-0006230&007.768117&%2b23.952312&%2095&999&1996.3&%20%20%20%20%200&%20%20%20%20%200&2&%20&%20&%20&19.57&17.72%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6623bd013a85d3&-out.add=.&-source=I/284/out&USNO-B1.0===1139-0006229&-out.orig=o' class='full'3 2.62200 31 04.33800+23 57 09.76321139-0006229007.768075+23.9527121222661975.4 0 0417.2917.1717.3216.88   %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20Naval%20Observatory%20Merged%20Astrometric%20Dataset%20%28NOMAD%29%20contains%0aastrometric%20and%20photometric%20data%20for%20over%201%20billion%20stars%20derived%20from%0athe%20Hipparcos%20%28I/239%29,%20Tycho-2%20%28I/259%29,%20UCAC2%20%28I/289%29,%20and%20USNO-B1.0%0a%28I/284%29%20catalogs%20for%20astrometry%20and%20optical%20photometry,%20supplemented%0aby%202MASS%20%28II/246%29%20near-infrared%20photometry.%3cBR%3e%0a%3cFONT%20SIZE=%27-1%27%3eAn%20efficient%20remote%20query%20program%20%3cB%3efindnomad1%20is%0aavailable%20in%20the%20cdsclient%20%0apackage,%20for%20Unix/Linux%20platforms%0a%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	NOMAD1	YM	RAJ2000 deg	DEJ2000 deg	r	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)	Bmag mag	r_	Vmag mag	r_	Rmag mag	r_	Jmag mag	Hmag mag	Kmag mag	R
1	0.737	00 31 04.411344	+23 57 08.15004	1139-0006316	..	007.7683806	+23.9522639	B	0.0	0.0	0.0	0.0	19.880	o			19.650	B
2	1.398	00 31 04.348008	+23 57 08.31996	1139-0006315	..	007.7681167	+23.9523111	B	0.0	0.0	0.0	0.0					19.570	B
3	2.619	00 31 04.338000	+23 57 09.75996	1139-0006314	..	007.7680750	+23.9527111	B	0.0	0.0	0.0	0.0	17.320	B			16.880	B

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.3 [****ClosingBrace(s)Inserted****]
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GSC2.3

%22>RAJ2000
degDEJ2000
degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 2.09000 31 04.37976+23 57 09.4320NBIZ001088007.768249+23.9526201989.89117.2618.4618.0418.193 4.44 0.17 %0a%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RAJ2000 deg	DEJ2000 deg	pmRA mas/yr	pmDE mas/yr	Jmag mag	Kmag mag	b1mag mag	b2mag mag	r1mag mag	r2mag mag	imag mag	No	fl
1	1.044	00 31 04.35912	+23 57 07.9020	007.768163	+23.952195	-16.8	-21.9			19.88			19.65		2	0
2	2.450	00 31 04.35528	+23 57 09.6876	007.768147	+23.952691	7.3	-4.7			17.29	17.32	17.17	16.88		4	0

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 (...)	e_DEJ2000 arcsec	magBJ mag	e_ mag	magRF mag	e_ mag	magG mag	e_ [****ClosingBrace(s)Inserted****]
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e_

%20

%22>%5cFONT SIZE=-1magmagGrvs
mag

e_
mag

alphaEpoch
yr

deltaEpoch
yr

pmRA
mas/yr

e_
(...)

pmDE
mas/yr

e_
(...)

1 2.14500 31 04.37222+23 57 09.4531007.768218+23.952626 0.400 0.40018.459 0.30017.264 0.30017.495 0.40016.533 0.5001989.89001989.8900 -10.1 11.3 2.3 11.4 2 2.80500 31 04.35156+23 57 10.0514007.768131+23.952792 0.056 0.05317.320 0.40016.880 0.40018.063 0.08317.112 0.1122004.72002004.7200 7.3 5.5 -4.7 5.5 %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RAICRS deg	e_ mas	DEICRS deg	e_ mas	ID	Type	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)	Nobs	Dt yr	Rmag mag	Bmag mag	Nmag mag	Vmag mag	Jmag mag	Hmag mag	Kmag mag
1	2.211	00 31 04.369011	+23 57 09.50678	007.7682042	155.00	+23.9526408	89.00	64091+0001088	4	-2.7	4.7	-0.5	2.7	4	39.041	17.264	18.459	18.192	18.036

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