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	15.009	22 48 57.16152	-45 19 13.2132	0375-40041559	342.238173	-45.320337			20.5	17.5	1980.279
2	16.647	22 48 54.93000	-45 19 03.6300	0375-40041314	342.228875	-45.317675			18.0	17.9	1980.279
3	21.053	22 48 56.62872	-45 19 21.0720	0375-40041489	342.235953	-45.322520			20.9	17.5	1980.279

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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	16.865	22 48 54.90936	-45 19 03.6552	S33031101207	342.228789	-45.317682	1992.639	17.97	0.33	18.93	0.24	0	2.63	0.11

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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	15.240	22 48 57.17472	-45 19 13.4004	0446-0806002	342.238228	-45.320389	3	170	1980.2	0	0	2		20.44	20.65
2	16.470	22 48 54.94080	-45 19 03.3132	0446-0805997	342.228920	-45.317587	105	48	1988.4	0	0	4		18.82	18.53	17.99	17.12
3	20.702	22 48 56.61600	-45 19 20.7300	0446-0806001	342.235900	-45.322425	14	20	1984.3	-14	0	3		20.38	20.64	20.52

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	15.240	22 48 57.174672	-45 19 13.40004	0446-0890280	..	342.2382278	-45.3203889	B	0.0	0.0	0.0	0.0	20.650	B			20.440	e
2	16.471	22 48 54.940656	-45 19 03.30996	0446-0890275	Y.	342.2289194	-45.3175861	B	0.0	0.0	0.0	0.0	18.100	Y	17.540	Y	17.990	B
3	20.702	22 48 56.616000	-45 19 20.73000	0446-0890279	..	342.2359000	-45.3224250	B	-14.0	0.0	0.0	1.0	20.640	B			20.520	B

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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 2.11022 48 56.38176-45 19 01.9668SC0K011696342.234924-45.3172131976.743  21.86    3 1.35 0.33 214.90522 48 57.21432-45 19 12.7668SC0K011691342.238393-45.3202131976.743  21.78    3 1.44 0.38 316.86322 48 54.90936-45 19 03.6480SC0K001207342.228789-45.3176801992.63917.9718.93  17.583 2.63 0.11 420.93122 48 56.61504-45 19 20.9604SC0K001193342.235896-45.3224891992.63919.6721.66    3 1.77 0.17 %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	16.394	22 48 54.95352	-45 19 03.5796	342.228973	-45.317661	-3.0	-26.3				18.53	18.82	17.99	17.12	4	0
2	21.085	22 48 56.64072	-45 19 21.0936	342.236003	-45.322526	-12.9	-31.3				20.64	20.38	20.52		3	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	magBJ mag	e_ mag	magRF mag	e_ mag	magG mag	e_ [****ClosingBrace(s)Inserted****]
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e_

%20

%22>%5cFONT SIZE=-1magmagGrvs
mag

e_
mag

alphaEpoch
yr

deltaEpoch
yr

pmRA
mas/yr

e_
(...)

pmDE
mas/yr

e_
(...)

116.39322 48 54.95356-45 19 03.5798342.228973-45.317661 0.115 0.11518.929 0.30017.966 0.30018.172 0.40017.370 0.5001988.47001988.4700 -3.0 12.7 -26.3 12.7 221.08522 48 56.64076-45 19 21.0940342.236003-45.322526 0.133 0.13321.658 0.30019.673 0.30019.863 0.40018.405 0.5001984.39001984.3900 -12.9 20.4 -31.3 20.4 %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	16.487	22 48 54.943399	-45 19 03.52891	342.2289308	168.00	-45.3176469	24.00	48340+0001207	0	9.5	11.9	0.0	1.7	3	23.986	17.966	18.929	17.583

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