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	26.627	00 01 48.39336	+28 02 38.6232	1125-00012380	000.451639	+28.044062			17.0	16.5	1954.830
2	29.881	00 01 51.54888	+28 02 28.1904	1125-00012727	000.464787	+28.041164			18.9	17.1	1954.830

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cB%3e%3cFONT%20COLOR=%27#CD5B45%27>%20The%20current%20version%20includes%20only%20the%20North%20%28POSS-I%20plates%29%3cP%3e%0a

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	18.952	00 01 50.83944	+28 02 22.1928	EO0606-0471243	000.461831	+28.039498	19.69		-1	-0.64	4.0	0.23	21.91	L	0			2.22
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>18.952&%3cFONT%20COLOR=%27#CD5B45%27>00%2001%2050.83944&%3cFONT%20COLOR=%27#CD5B45%27>%2b28%2002%2022.1928&EO0606-0471243&000.461831&%2b28.039498&19.69&%20&-1&%20%20-0.64&%20%20%204.0&%200.23&21.91&L&%200&%20&%20&%20%202.22&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663b1b066d6c7&-out.add=.&-source=I/267/out&APM-ID===EO0606-0471284&-out.orig=o' class='full'222.23900 01 47.84280+28 02 21.1524EO0606-0471284000.449345+28.03920919.83   1 3.05 4.6 0.4421.91L 0     2.08   325.19700 01 50.72136+28 02 35.3328EO0606-0470939000.461339+28.04314818.67  -1 -0.69 5.7 0.1721.91L 0     3.24   426.81600 01 48.39144+28 02 38.8320EO1257-0295346000.451631+28.04412016.24  -1 -1.29 7.9 0.0316.90  -1 1.52 9.6 0.66   526.88000 01 48.36744+28 02 38.7024EO0606-0470870000.451531+28.04408416.71  -1 -0.31 8.8 0.1617.49  -1 -0.65 9.1 0.78   628.30000 01 48.44472+28 01 51.4704EO1257-0295878000.451853+28.03096420.00L 0      19.23  -1 -3.28 5.7 -0.77   %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20construction%20of%20the%20%0a%3cB%3eGSC-II%20%0ais%20still%20in%20progress:%20this%0aversion%20has%20no%20proper%20motions,%20and%20the%20magnitude%20limits%20are%2018.5%20in%20F%20%28red%29%0aand%2019.5%20in%20J%20%28blue%29.%20The%20data%20are%20%3cB%3e%3cFONT%20COLOR=%27#0000CD%27>copyrighted,%20check%20%0athe%20%3cB%3edata%20use%20Policy.%0a%3cP%3e%0a

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	26.639	00 01 48.34776	+28 02 38.2380	N32213107927	000.451449	+28.043955	1990.661	16.43	0.42	17.24	0.43	0	3.16	0.07
2	26.898	00 01 48.37752	+28 02 38.8104	N322131012876	000.451573	+28.044114	1989.825	16.54	0.43	17.04	0.44	0	2.83	0.06
3	29.712	00 01 51.54600	+28 02 27.8520	N32213107891	000.464775	+28.041070	1990.661	17.10	0.42	19.23	0.43	0	3.10	0.11

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eUSNO-B%20Catalog%20presents%20positions,%20proper%20motions,%20%0amagnitudes%20un%20blue,%20red%20and%20infrared,%20as%20well%20as%20star/galaxy%20estimators%0afor%201,045,175,762%20objects%20derived%20from%203,648,832,040%20separate%20observations.%0aThe%20data%20were%20taken%20from%20scans%20of%207,435%20Schmidt%20plates%0ataken%20from%20various%20sky%20surveys%20during%20the%20last%2050%20years.%3cBR%3e%0aUSNO-B1.0%20catalog%20was%20created%20by%20Dave%20Monet%20and%20collaborators%0aat%20http://www.nofs.navy.mil/data/fchpix/%20%3cBR%3e%0a%3cB%3e%3cFONT%20COLOR=%27#EE0000%27>%20Note%20that%20the%20star/galaxy%20estimators%20may%20be%20mixed%20up%0a%20in%20dense%20regions.%0a%3cP%3e%0a

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 [****ClosingBrace(s)Inserted****]
">

Imag

%22>%5cFONT SIZE=-1mag 1 0.75000 01 49.42488+28 02 16.10161180-0000827000.455937+28.0378063617041973.6 0 0221.09  21.16     212.64900 01 50.43480+28 02 16.90081180-0000835000.460145+28.0380283708511978.7 -70 -3983  16.9121.2719.92   322.41100 01 47.79744+28 02 13.87321180-0000811000.449156+28.0371879993031966.6 46 -136321.3119.7120.75     427.20500 01 48.35136+28 02 38.95081180-0000818000.451464+28.044153 201191976.8 -6 8516.5215.9817.3215.9016.11 %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	0.753	00 01 49.424664	+28 02 16.10016	1180-0000823	..	000.4559361	+28.0378056	B	0.0	0.0	0.0	0.0	21.160	B
2	12.647	00 01 50.434656	+28 02 16.90008	1180-0000831	..	000.4601444	+28.0380278	B	-70.0	13.0	-398.0	30.0	21.270	B			19.920	B
3	22.412	00 01 47.797344	+28 02 13.86996	1180-0000807	..	000.4491556	+28.0371861	B	46.0	79.0	-136.0	7.0	20.750	B			19.710	e
4	27.204	00 01 48.351336	+28 02 38.95008	1180-0000814	YM	000.4514639	+28.0441528	B	-6.0	0.0	8.0	3.0	16.780	Y	16.590	Y	15.900	B	15.871	15.253	15.515

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20Zone%20-30/%2b50deg%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	[****ClosingBrace(s)Inserted****]
">

%22h:m:s%22&%">\BegDIVclass='sort-down ' </A>string _DEJ2000
"d:m:s"CMC14

f_

RAICRS
deg

DEICRS
deg

r'mag
mag

Nt

Jmag
mag

Hmag
mag

Ksmag
mag

127.04300 01 48.35328+28 02 38.7744000148.3+280238  000.451472+28.04410416.801 115.87115.254   %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20This%20version%20of%20the%20%0a%3cB%3eGSC-II%0ahas%20no%20proper%20motions,%20but%20the%20limits%20on%20brightness%20which%20existed%20on%0a%20%28F<18.5,%20B_j<19.5%29%20were%20removed.%0a%25The%20data%20are%20%3cB%3e%3cFONT%20COLOR=%27#0000CD%27>copyrighted,%20check%0a%25the%20%3cB%3edata%20use%20Policy.%0a%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.3	RAJ2000 deg	DEJ2000 deg	Epoch yr	Fmag mag	jmag mag	Vmag mag	Nmag mag	Class	a pix	e
1	13.979	00 01 50.49792	+28 02 19.9752	NBJO049005	000.460408	+28.038882	1993.642		22.39			3	1.48	0.14
2	26.899	00 01 48.37776	+28 02 38.8140	NBJO007927	000.451574	+28.044115	1989.825	16.54	17.04	16.73	16.06	0	2.83	0.06

%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 [****ClosingBrace(s)Inserted****]
">

fl

%20

%22> 1 0.72700 01 49.44144+28 02 16.7316000.456006+28.037981 11.4 13.2    21.0921.16       2 0 212.62100 01 50.43168+28 02 17.1240000.460132+28.038090 -72.5 -394.6      21.2716.9119.92   3 0 322.22300 01 47.81352+28 02 13.6536000.449223+28.037126 68.7 -143.1    21.3120.7519.71     3 1 427.00300 01 48.36504+28 02 38.8284000.451521+28.044119 -5.1 3.115.87115.51516.5217.3215.9815.9016.11 6 0 %0a%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	ID	RAICRS deg	DEICRS deg	pmRAp mas/yr	pmDEp mas/yr	pmRAx mas/yr	pmDEx mas/yr	Fmag mag	Bjmag mag	Vmag mag	Nmag mag	Jmag mag	e_ mag	Hmag mag	e_ mag	Kmag mag	e_ mag	2Mkey	Bmag mag	Rmag mag	Fld	dT yr	fg	fs	M
1	26.982	00 01 48.37126	+28 02 38.8572	XPM 236-0000501	000.451547	+28.044127	-6.61	0.46	-6.29	0.62	16.542	17.037	16.731	16.058	15.871	0.080	15.254	0.089	15.515	0.190	350139563	17.0	16.5	293	43.923893	0	0	M

%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"	RAJ2000 [****ClosingBrace(s)Inserted****]
">

RAJ2000

%20

%22>%5cFONT SIZE=-1degDEJ2000
deg

e_RAJ2000
(...)

e_DEJ2000
arcsec

magBJ
mag

e_
mag

magRF
mag

e_
mag

magG
mag

e_
mag

magGrvs
mag

e_
mag

alphaEpoch
yr

deltaEpoch
yr

pmRA
mas/yr

e_
(...)

pmDE
mas/yr

e_
(...)

122.22300 01 47.81353+28 02 13.6538000.449223+28.037126 0.163 0.13320.750 0.40019.710 0.40019.926 0.40019.070 0.5001966.64001966.6400 68.7 7.6 -143.1 7.0 226.87500 01 48.37091+28 02 38.7267000.451545+28.044091 0.002 0.00217.037 0.30016.542 0.30016.760 0.08016.006 0.1102003.74002003.7400 -5.1 4.5 3.1 4.5 %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20Zone%20-40/%2b50deg%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC15	RA_ICRS deg	DE_ICRS deg	r'mag mag	pflag	Nt	Jmag mag	Hmag mag	Ksmag mag
1	27.008	00 01 48.35810	+28 02 38.7743	000148.3+280238	000.451492	+28.044104	16.801		1	15.871	15.254

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cP%3e%0a