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	0.687	15 20 20.66016	+28 06 13.7016	1125-07233724	230.086084	+28.103806			19.7	19.1	1954.485
2	1.632	15 20 20.59680	+28 06 14.6628	1125-07233717	230.085820	+28.104073			20.0	19.3	1954.485

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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 [****ClosingBrace(s)Inserted****]
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Mflag

%22> 1 0.96315 20 20.65008+28 06 13.3812EO1092-0150419230.086042+28.10371718.84   2 6.32 8.6 0.3420.44   1 7.91 9.3 1.60   %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	0.809	15 20 20.64936	+28 06 13.7412	N133023314187	230.086039	+28.103817	1990.160			19.08	0.36	3	4.47	0.49

%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 mag
1	0.636	15 20 20.66016	+28 06 13.9320	1181-0262845	230.086084	+28.103870	98	157	1976.5	0	0	5	19.86	19.54	20.01	19.30	18.60
2	1.410	15 20 20.65008	+28 06 12.7800	1181-0262844	230.086042	+28.103550	688	999	1954.4	0	0	2	20.02	19.35
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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	0.639	15 20 20.659992	+28 06 13.92984	1181-0266755	..	230.0860833	+28.1038694	B	0.0	0.0	0.0	0.0	20.010	B			19.300	B
2	1.410	15 20 20.650008	+28 06 12.78000	1181-0266754	..	230.0860417	+28.1035500	B	0.0	0.0	0.0	0.0	20.020	o			19.350	e
3	3.292	15 20 20.477328	+28 06 15.18984	1181-0266753	..	230.0853222	+28.1042194	B	-38.0	10.0	22.0	3.0	19.870	o			19.830	e

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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

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%22>RAJ2000
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deg

Epoch
yr

Fmag
mag

jmag
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1 0.54315 20 20.68200+28 06 13.5432N65R014187230.086175+28.1037621987.30218.7419.0819.1218.193 3.71 0.48 %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	0.706	15 20 20.65488	+28 06 13.9968	230.086062	+28.103888	-5.5	2.2			19.86	20.01	19.54	19.30	18.60	5	0
2	3.243	15 20 20.47656	+28 06 15.0228	230.085319	+28.104173	-41.4	18.3			19.87		19.83		18.86	3	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 [****ClosingBrace(s)Inserted****]
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1 0.53915 20 20.67083+28 06 13.7472230.086128+28.103819 0.054 0.03619.080 0.30018.744 0.30018.824 0.08417.801 0.1132003.47002003.4700 -5.5 5.6 2.2 5.6 2 3.24415 20 20.47651+28 06 15.0230230.085319+28.104173 0.133 0.13319.870 0.40019.830 0.40019.826 0.40019.713 0.5001968.42001968.4200 -41.4 6.7 18.3 6.7 %0a%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	0.480	15 20 20.671978	+28 06 13.93405	230.0861332	480.00	+28.1038706	323.00	57135+0014187	4	-11.9	39.8	12.6	26.8	4	13.925	18.744	19.080	18.190	19.118

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2	RA_ICRS deg	DE_ICRS deg	objID	Epoch yr	Class	Gmag [****ClosingBrace(s)Inserted****]
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Gmag

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%22>%5cFONT SIZE=-1magOMag
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pix

1 0.53715 20 20.6723445557+28 06 13.535478924N65R014187230.08613072000+28.10381580000 11330233141872012.7673    19.08060018.744300  18.190700      20.87320.82920.30319.65019.62919.5224          15.86015.59612.240 9.165  21.989 3.705 0.476 38.0 2 1.32815 20 20.7707520000+28 06 12.923028000N65R069049230.08654480000+28.10358973000 11330233690492012.7913                        20.81420.001                               3 5.97215 20 20.2603632000+28 06 14.707764000N65R035065230.08441818000+28.10408549000 11330233350652013.2823                  25.34124.00921.58121.19020.890                               %0a%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20SDSS%20is%20also%20available%20from%20http://www.sdss.org/%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	mode	cl	SDSS	m_	zsp	umag mag	e_ mag	gmag mag	e_ mag	rmag mag	e_ mag	imag mag	e_ mag	zmag mag	e_ mag	RA_ICRS deg	DE_ICRS deg	ObsDate yr	Q
1	0.551	15 20 20.66849	+28 06 13.7664	1	3	J152020.66+280613.7			20.886	0.133	19.595	0.019	18.967	0.017	18.539	0.017	18.213	0.048	230.086122	+28.103824	2003.4803	3
2	6.527	15 20 20.21592	+28 06 14.3748	1	3	J152020.21+280614.3			25.196	0.870	23.398	0.230	22.248	0.144	21.463	0.100	21.106	0.259	230.084233	+28.103993	2003.4803	3

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