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	8.625	20 56 21.32352	+28 16 13.0512	1125-17463072	314.088848	+28.270292			18.8	18.4	1953.452

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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	0.750	20 56 20.84616	+28 16 07.9680	N033310218437	314.086859	+28.268880	1992.564	18.01	0.45			3	4.36	0.42
2	8.231	20 56 21.29088	+28 16 12.9756	N033310218436	314.088712	+28.270271	1992.564	18.37	0.45			3	2.43	0.10

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B1mag
magR1mag
magB2mag
magR2mag
magImag
mag 1 0.41520 56 20.81616+28 16 08.31001182-0593760314.086734+28.2689751492541995.6 0 02      17.7218.31 2 0.48720 56 20.75952+28 16 08.35321182-0593758314.086498+28.2689872451631993.5 0 03    20.1418.9218.12 3 8.43420 56 21.31536+28 16 12.87121182-0593764314.088814+28.2702421231001977.1 0 0519.1918.4119.8818.4918.09 %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	0.414	20 56 20.815992	+28 16 08.31000	1182-0616079	..	314.0867333	+28.2689750	B	0.0	0.0	0.0	0.0					17.720	B
2	0.487	20 56 20.759328	+28 16 08.34996	1182-0616077	..	314.0864972	+28.2689861	B	0.0	0.0	0.0	0.0	20.140	B			18.920	B
3	8.433	20 56 21.315336	+28 16 12.87012	1182-0616083	..	314.0888139	+28.2702417	B	0.0	0.0	0.0	0.0	19.880	B			18.490	B
4	9.843	20 56 20.688000	+28 16 17.82984	1182-0616074	YM	314.0862000	+28.2716194	Y	14.5	9.0	-23.1	9.0			16.020	Y			15.778	15.574	14.548

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mag

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mag

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mag

1 9.46720 56 20.68248+28 16 17.4396205620.6+281617  314.086177+28.27151116.555 115.778     %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	0.312	20 56 20.78712	+28 16 07.7700	N34I018437	314.086613	+28.268825	1995.568	18.69	20.97		17.93	3	4.20	0.50
2	8.606	20 56 21.33000	+28 16 12.8928	N34I082617	314.088875	+28.270248	1990.562		19.87			3	2.92	0.21
3	8.650	20 56 21.35064	+28 16 12.5472	N34I018436	314.088961	+28.270152	1995.568	18.57	19.97		17.93	3	2.48	0.16

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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	[****ClosingBrace(s)Inserted****]
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mag&%">\BegDIVclass='sort-down ' </A>decNo

fl

1 8.44520 56 21.31824+28 16 12.8352314.088826+28.270232 2.0 -4.3    19.1919.8818.4118.4918.09 5 0 %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 deg	DEJ2000 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_ (...)
1	0.234	20 56 20.78093	+28 16 07.8792	314.086587	+28.268855	0.400	0.400	20.972	0.300	18.688	0.300	18.798	0.400	17.180	0.500	1995.5700	1995.5700	-18.0	19.4	25.5	10.4
2	8.445	20 56 21.31828	+28 16 12.8346	314.088826	+28.270232	0.103	0.103	19.865	0.300	18.490	0.400	18.731	0.400	17.647	0.500	1977.1200	1977.1200	2.0	5.3	-4.3	5.3
3	9.907	20 56 20.68359	+28 16 17.8862	314.086182	+28.271635	0.299	0.299	20.280	0.500	17.909	0.500	17.987	0.400	16.324	0.500	1997.8000	1997.8000	0.0	0.0	0.0

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1 9.46720 56 20.68251+28 16 17.4395205620.6+281617314.086177+28.27151116.555   115.778     %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"	URAT1	RAICRS deg	DEICRS deg	Epoch yr	f.mag mag	e_ mag	pmRA mas/yr	pmDE mas/yr	Jmag mag	Hmag mag	Kmag mag	Bmag mag	Vmag mag	gmag mag	rmag mag	imag mag
1	9.496	20 56 20.688423	+28 16 17.83169	592-579126	314.0862675	+28.2715300	2013.270	16.373	0.055	15.7	-24.4	15.778	15.575	14.548

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