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	5.378	02 05 50.48952	+18 22 35.5332	1050-00578012	031.460373	+18.376537			18.0	16.8	1954.679
2	9.711	02 05 50.69280	+18 22 20.8704	1050-00578031	031.461220	+18.372464			19.5	18.8	1954.679

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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	5.222	02 05 50.47344	+18 22 35.2632	EO1202-0116181	031.460306	+18.376462	17.44		2	23.75	10.2	0.12	18.10		2	42.20	14.2	0.66
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%205.222&%3cFONT%20COLOR=%27#CD5B45%27>02%2005%2050.47344&%3cFONT%20COLOR=%27#CD5B45%27>%2b18%2022%2035.2632&EO1202-0116181&031.460306&%2b18.376462&17.44&%20&%202&%20%2023.75&%20%2010.2&%200.12&18.10&%20&%202&%20%2042.20&%20%2014.2&%20%200.66&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6643212c1d0336&-out.add=.&-source=I/267/out&APM-ID===EO1202-0116371&-out.orig=o' class='full'2 9.71402 05 50.70288+18 22 20.8812EO1202-0116371031.461262+18.37246718.61  -1 1.49 5.7 0.1020.07  -1 -0.96 5.2 1.46   %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	5.910	02 05 50.47008	+18 22 35.9940	N3312010600	031.460292	+18.376665	1990.719	17.22	0.32	18.75	0.32	3	5.06	0.15

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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	3.828	02 05 50.46936	+18 22 33.6108	1083-0034165	031.460289	+18.376003	616	999	1973.2	0	0	2	19.82		21.17
2	4.581	02 05 50.55144	+18 22 34.9824	1083-0034166	031.460631	+18.376384	999	255	1973.2	0	0	2		16.94	21.01
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%204.581&%3cFONT%20COLOR=%27#CD5B45%27>02%2005%2050.55144&%3cFONT%20COLOR=%27#CD5B45%27>%2b18%2022%2034.9824&1083-0034166&031.460631&%2b18.376384&999&255&1973.2&%20%20%20%20%200&%20%20%20%20%200&2&%20&16.94&21.01&%20&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6643212c1d0336&-out.add=.&-source=I/284/out&USNO-B1.0===1083-0034163&-out.orig=o' class='full'3 5.30502 05 50.45352+18 22 35.21281083-0034163031.460223+18.3764481935201976.4 0 0518.4818.5116.6415.6916.53 4 9.80302 05 50.66736+18 22 20.75161083-0034168031.461114+18.372431 78 781976.4 0 0520.3619.1920.0019.3918.68 %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	3.828	02 05 50.469336	+18 22 33.61008	1083-0034374	..	031.4602889	+18.3760028	B	0.0	0.0	0.0	0.0	21.170	B
2	4.579	02 05 50.551344	+18 22 34.97988	1083-0034375	..	031.4606306	+18.3763833	B	0.0	0.0	0.0	0.0	21.010	B			16.940	e
3	5.304	02 05 50.453328	+18 22 35.20992	1083-0034372	..	031.4602222	+18.3764472	B	0.0	0.0	0.0	0.0	16.640	B			15.690	B
4	9.804	02 05 50.667336	+18 22 20.75016	1083-0034377	Y.	031.4611139	+18.3724306	B	0.0	0.0	0.0	0.0	20.000	B	17.970	Y	19.390	B

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Full	_r arcsec	_RAJ2000 [****ClosingBrace(s)Inserted****]
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%3cEM%3e%20%3cFONT%20COLOR=%27#CD5B45%27>_RAJ2000

%22>%5cFONT SIZE=-1"h:m:s" _DEJ2000
"d:m:s"GSC2.3

RAJ2000
degDEJ2000
degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 5.91302 05 50.47008+18 22 35.9976NC5G000600031.460292+18.3766661990.71917.2218.7518.81  3 5.06 0.15 2 9.71002 05 50.69712+18 22 20.8776NC5G000589031.461238+18.3724661990.71919.0220.2219.24  0 2.03 0.09 %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	3.161	02 05 50.49384	+18 22 33.0384	031.460391	+18.375844	15.8	-64.5			19.82	21.17				2	0
2	4.410	02 05 50.58312	+18 22 34.8996	031.460763	+18.376361	28.2	-4.5				21.01	16.94			2	0
3	5.690	02 05 50.47200	+18 22 35.7672	031.460300	+18.376602	7.0	13.2			18.48	16.64	18.51	15.69	16.53	5	0
4	9.770	02 05 50.67528	+18 22 20.7912	031.461147	+18.372442	-3.0	3.8			20.36	20.00	19.19	19.39	18.68	5	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	[****ClosingBrace(s)Inserted****]
">

arcsec&%">\BegDIVclass='sort-down ' </A>decmagBJ
mage_
magmagRF
mage_
magmagG
mage_
magmagGrvs
mage_
magalphaEpoch
yrdeltaEpoch
yrpmRA
mas/yre_
(...)pmDE
mas/yre_
(...) 1 4.41102 05 50.58317+18 22 34.9001031.460763+18.376361 0.163 0.16321.010 0.40016.940 0.40015.507 0.40013.372 0.5001973.22001973.2200 28.2 8.8 -4.5 8.8 2 5.51302 05 50.46982+18 22 35.5597031.460291+18.376544 0.079 0.17918.745 0.30017.220 0.30017.631 0.08316.621 0.1122009.04002009.0400 7.0 5.7 13.2 5.7 %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	5.952	02 05 50.455198	+18 22 35.94785	031.4602300	132.00	+18.3766522	96.00	64900+0000600	4	-9.6	4.7	9.2	3.5	6	36.199	17.220	18.745		18.808
2	9.814	02 05 50.693064	+18 22 20.76698	031.4612211	90.00	+18.3724353	109.00	64900+0000589	0	-2.8	3.2	1.8	3.9	6	36.199	19.021	20.220		19.241

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RA_ICRS deg	e_ mas	DE_ICRS deg	e_ mas	Source	Plx mas	[****ClosingBrace(s)Inserted****]
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mas&%">\BegDIVclass='sort-down ' </A>decpmRA
mas/yrpmDE
mas/yrRADEcor

Dup

<FG>
e-/se_
e-/s<Gmag>
magVar

1 9.96402 05 50.690944539+18 22 20.61350195031.4612122689 6.413+18.3723926394 1.255 92587675152158720      -0.9150 2.9524e+02 2.0369e+0019.349NOT_AVAILABLE %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"	RAJ2000 deg	DEJ2000 deg	ipix	comp	pmRA mas/yr	pmDE mas/yr	Jmag mag	Hmag mag	Kmag mag	B1mag mag	B2mag mag	R1mag mag	R2mag mag	Imag mag	GaiaId	Gmag mag	Clone	Nosc
1	9.943	02 05 50.688105384	+18 22 20.63198928	031.4612004391	+18.3723977748	2136231463371644055		2.682	-1.232				20.36	20.00	19.19	19.39	18.68	92587675152158720	19.349

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