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	6.610	20 47 31.67616	+18 03 46.9800	1050-18629151	311.881984	+18.063050			16.9	16.1	1953.748

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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	0.090	20 47 32.14056	+18 03 47.7504	N031332022588	311.883919	+18.063264	1988.705			18.49	0.44	3	2.26	0.07
2	6.939	20 47 31.65528	+18 03 46.7352	N031332022586	311.881897	+18.062982	1992.667	16.34	0.42	17.21	0.43	0	3.19	0.06

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B1mag
magR1mag
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magR2mag
magImag
mag 1 1.56020 47 32.24208+18 03 47.43001080-0648640311.884342+18.0631756865021982.4 200 -106420.96  18.2518.9918.86 2 6.98420 47 31.65216+18 03 46.73161080-0648624311.881884+18.062981 811381976.2 0 0517.6516.2816.7216.5815.97 3 9.77920 47 32.46744+18 03 39.25081080-0648643311.885281+18.0609031182261981.6 0 04  19.5821.4919.8818.14 %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	1.560	20 47 32.242008	+18 03 47.43000	1080-0683162	..	311.8843417	+18.0631750	B	200.0	28.0	-106.0	20.0	18.250	B			18.990	B
2	6.986	20 47 31.651992	+18 03 46.73016	1080-0683146	YM	311.8818833	+18.0629806	B	0.0	0.0	0.0	0.0	15.720	Y	15.670	Y	16.580	B	15.291	14.878	14.724
3	9.779	20 47 32.467344	+18 03 39.25008	1080-0683166	..	311.8852806	+18.0609028	B	0.0	0.0	0.0	0.0	21.490	B			19.880	B

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC14 [****ClosingBrace(s)Inserted****]
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1 7.06020 47 31.64976+18 03 46.4832204731.6+180346  311.881874+18.06291216.581 215.29114.879   %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	0.509	20 47 32.15160	+18 03 48.2688	N2RC022588	311.883965	+18.063408	1992.667	19.05	18.49		18.37	3	2.25	0.09
2	6.935	20 47 31.65552	+18 03 46.7388	N2RC022586	311.881898	+18.062983	1992.667	16.34	17.21	16.53	16.06	0	3.19	0.06
3	9.973	20 47 32.48832	+18 03 39.1968	N2RC022461	311.885368	+18.060888	1992.667	19.55	21.73		18.43	3	2.10	0.22

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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 1.31320 47 32.22432+18 03 47.4408311.884268+18.063178 196.3 -107.9    20.9618.25  18.9918.86 4 0 2 7.10320 47 31.64616+18 03 46.5228311.881859+18.062923 -1.7 -10.715.29114.72517.6516.7216.2816.5815.97 6 0 3 9.73520 47 32.46192+18 03 39.2580311.885258+18.060905 -1.1 -3.1      21.4919.5819.8818.14 4 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	7.095	20 47 31.64686	+18 03 46.5119	XPM 216-0845767	311.881862	+18.062920	-2.73	-8.56	-2.34	-8.33	16.336	17.211	16.529	16.059	15.291	0.046	14.879	0.067	14.725	0.130	64725776	16.9	16.1	457	44.771175	0	0	M

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	UCAC4	RAJ2000 [****ClosingBrace(s)Inserted****]
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RAJ2000

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%22>%5cFONT SIZE=-1degDEJ2000
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ePos
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mag

of

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mas/yr

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1 6.78920 47 31.665552+18 03 46.77228541-135749311.8819398+18.0629923 23416.2780 0 5.2 0.615.29114.725        000000010 %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	1.197	20 47 32.16345	+18 03 48.9431	311.884014	+18.063595	0.400	0.400	18.486	0.300	19.046	0.300	18.861	0.400	19.217	0.500	1992.6700	1992.6700	23.2	19.1	92.6	44.6
2	1.313	20 47 32.22433	+18 03 47.4410	311.884268	+18.063178	0.115	0.115	18.250	0.400	18.990	0.400	18.752	0.400	19.247	0.500	1982.4000	1982.4000	196.3	6.9	-107.9	6.9
3	6.789	20 47 31.66552	+18 03 46.7720	311.881940	+18.062992	0.131	0.138	17.211	0.300	16.336	0.300	16.528	0.400	15.790	0.500	1983.6800	1980.7200	5.2	5.4	0.6	5.5
4	9.735	20 47 32.46197	+18 03 39.2579	311.885258	+18.060905	0.115	0.115	21.732	0.300	19.554	0.300	19.697	0.400	18.134	0.500	1981.6100	1981.6100	-1.1	7.0	-3.1	7.0

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