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	0.943	21 28 20.01600	+55 28 48.1908	1425-11906766	322.083400	+55.480053			18.8	18.6	1955.936
2	8.168	21 28 20.18280	+55 28 56.0100	1425-11906806	322.084095	+55.482225			19.2	17.9	1955.936

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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	0.399	21 28 20.07912	+55 28 48.0576	N012203236271	322.083663	+55.480016	1991.595			19.25	0.42	0	2.12	0.08
2	8.359	21 28 20.14872	+55 28 56.2152	N012203236487	322.083953	+55.482282	1990.789	17.26	0.17	19.37	0.42	0	2.11	0.06

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>	\BegDIVclass='sort-down ' </A>
dec 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	0.490	21 28 20.09808	+55 28 48.3132	1454-0358384	322.083742	+55.480087	43	155	1977.7	18	2	5	18.81	18.38	19.60	18.57	17.10
2	8.302	21 28 20.13408	+55 28 56.1612	1454-0358385	322.083892	+55.482267	32	61	1977.7	-6	2	5	19.41	17.63	19.70	17.37	16.73
3	8.327	21 28 19.21536	+55 28 44.6628	1454-0358380	322.080064	+55.479073	246	110	1975.1	0	0	2		18.77			17.94

Note: The Naval Observatory Merged Astrometric Dataset (NOMAD) contains astrometric and photometric data for over 1 billion stars derived from the Hipparcos (I/239), Tycho-2 (I/259), UCAC2 (I/289), and USNO-B1.0 (I/284) catalogs for astrometry and optical photometry, supplemented by 2MASS (II/246) near-infrared photometry.
An efficient remote query program findnomad1 is available in the cdsclient package, for Unix/Linux platforms

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	0.487	21 28 20.098008	+55 28 48.30996	1454-0366593	.M	322.0837417	+55.4800861	B	18.0	1.0	2.0	5.0	19.600	B			18.570	B	16.300	15.349	15.034
2	8.301	21 28 20.134008	+55 28 56.16012	1454-0366595	YM	322.0838917	+55.4822667	B	-6.0	1.0	2.0	2.0	18.350	Y	17.910	Y	17.370	B	15.327	14.851	14.615
3	8.329	21 28 19.215336	+55 28 44.65992	1454-0366588	.M	322.0800639	+55.4790722	B	0.0	0.0	0.0	0.0					18.770	e	15.398	14.503	14.064

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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

%22>RAJ2000
degDEJ2000
degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 0.66821 28 20.08008+55 28 48.4356N1AM098447322.083667+55.4801211990.78919.1319.25  16.880 1.54 0.18 2 8.05021 28 19.25064+55 28 44.6664N1AM098357322.080211+55.4790741990.78919.24    17.340 1.57 0.12 3 8.36321 28 20.14896+55 28 56.2188N1AM098663322.083954+55.4822831990.78917.2619.3717.7216.580 2.11 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
1	0.433	21 28 20.07120	+55 28 47.9856	322.083630	+55.479996	11.3	-3.4	16.300	15.034	18.81	19.60	18.38	18.57	17.10	6	0
2	8.098	21 28 20.13768	+55 28 55.9560	322.083907	+55.482210	-6.1	0.5	15.328	14.615	19.41	19.70	17.63	17.37	16.73	6	0
3	8.373	21 28 19.22904	+55 28 44.2884	322.080121	+55.478969	7.4	-7.3	15.399	14.064			18.77		17.94	3	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 [****ClosingBrace(s)Inserted****]
">

Fmag

%20

%22>%5cFONT SIZE=-1magBjmag
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 0.48121 28 20.06447+55 28 47.9533XPM 290-0561223322.083602+55.479987 10.10 -1.64 10.94 -1.6519.12519.252  16.87616.300 0.12115.350 0.10015.034 0.197 72731325918.818.6 14643.53823500M 2 8.14921 28 20.14297+55 28 56.0064XPM 290-0561224322.083929+55.482224 -6.88 3.64 -6.04 3.6317.25819.37217.71816.57515.328 0.06914.851 0.07914.615 0.169 72731324519.217.9 14643.53823500M %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	0.433	21 28 20.07122	+55 28 47.9859	322.083630	+55.479996	0.073	0.073	19.252	0.300	19.125	0.300	19.146	0.400	18.966	0.500	1988.4400	1988.4400	11.3	4.4	-3.4	4.4
2	8.098	21 28 20.13765	+55 28 55.9561	322.083907	+55.482210	0.069	0.069	19.372	0.300	17.258	0.300	17.419	0.400	15.889	0.500	1989.7800	1989.7800	-6.1	4.3	0.5	4.3
3	8.373	21 28 19.22905	+55 28 44.2879	322.080121	+55.478969	0.073	0.073	23.387	0.500	19.243	0.300	17.698	0.400	15.562	0.500	1994.6300	1994.6300	7.4	5.6	-7.3	5.6

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