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	19.488	05 32 37.69800	-50 13 21.1512	0375-02005276	083.157075	-50.222542			19.8	17.7	1980.410
2	23.924	05 32 38.89944	-50 13 13.5732	0375-02005440	083.162081	-50.220437			19.5	17.8	1980.410

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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	19.026	05 32 37.68144	-50 13 20.7012	S01103223096	083.157006	-50.222417	1997.014	18.23	0.34			3	3.28	0.06
2	23.606	05 32 38.87832	-50 13 13.2132	S01103223107	083.161993	-50.220337	1997.014	18.27	0.34			0	2.90	0.15

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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	19.406	05 32 37.69944	-50 13 21.0432	0397-0046092	083.157081	-50.222512	45	12	1988.1	0	0	4		18.20	20.71	18.29	17.88
2	23.855	05 32 38.89416	-50 13 13.5120	0397-0046096	083.162059	-50.220420	3	104	1988.1	-6	-2	4		18.39	20.32	18.43	17.73

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	19.403	05 32 37.699344	-50 13 21.03996	0397-0046300	.M	083.1570806	-50.2225111	B	0.0	0.0	0.0	0.0	20.710	B			18.290	B	16.791	16.248	15.404
2	23.853	05 32 38.893992	-50 13 13.50984	0397-0046304	.M	083.1620583	-50.2204194	B	-6.0	0.0	-2.0	7.0	20.320	B			18.430	B	16.256	15.596	15.772

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.3	RAJ2000 deg	DEJ2000 deg	Epoch yr	[****ClosingBrace(s)Inserted****]
">

yr&%">\BegDIVclass='sort-down ' </A>decFmag
magjmag
mag

Vmag
magNmag
magClass

a
pixe

1 0.96005 32 36.67584-50 13 04.8432S116010154083.152816-50.2180121976.823  20.52  19.263 1.35 0.11 219.02305 32 37.68144-50 13 20.6976S116003096083.157006-50.2224161997.01418.2320.68  17.823 3.28 0.06 323.60705 32 38.87856-50 13 13.2096S116003107083.161994-50.2203361997.01418.2720.59  17.493 2.90 0.15 %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	19.317	05 32 37.70280	-50 13 20.9136	083.157095	-50.222476	0.7	4.4	16.791	15.405		20.71	18.20	18.29	17.88	5	0
2	23.920	05 32 38.90688	-50 13 13.3752	083.162112	-50.220382	-1.6	1.2	16.256	15.772		20.32	18.39	18.43	17.73	5	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	[****ClosingBrace(s)Inserted****]
">

mag&%">\BegDIVclass='sort-down ' </A>decNmag
magJmag
mage_
magHmag
mage_
magKmag
mage_
mag2Mkey

Bmag
magRmag
magFld

dT
yrfg

fs

M

119.33905 32 37.70136-50 13 20.9497XPM 079-0045695083.157089-50.222486 -1.01 2.37 -1.56 2.4418.23420.678  17.82216.791 0.15416.249 0.25315.405 0.194 69244778819.817.7 20419.46879200M 223.97205 32 38.91026-50 13 13.4365XPM 079-0045703083.162126-50.220399 2.78 -1.12 2.24 -1.0518.26720.591  17.49216.256 0.10615.596 0.11715.772 0.254 69244779219.517.8 20419.46879200M %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	19.317	05 32 37.70279	-50 13 20.9140	083.157095	-50.222476	0.093	0.093	20.678	0.300	18.234	0.300	18.284	0.400	16.586	0.500	1992.1700	1992.1700	0.7	10.8	4.4	10.8
2	23.920	05 32 38.90688	-50 13 13.3747	083.162112	-50.220382	0.101	0.101	20.591	0.300	18.267	0.300	18.363	0.400	16.725	0.500	1990.7800	1990.7800	-1.6	11.6	1.2	11.6

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