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	1.028	18 25 18.03672	+14 10 25.4820	0975-11542556	276.325153	+14.173745			18.9	17.2	1950.539
2	8.673	18 25 18.28344	+14 10 17.1624	0975-11542846	276.326181	+14.171434			18.7	17.5	1950.539

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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	0.729	18 25 18.02880	+14 10 25.1724	N020223042536	276.325120	+14.173659	1993.530	17.57	0.43	19.46	0.44	0	2.82	0.12
2	8.688	18 25 18.29112	+14 10 17.2092	N020223042426	276.326213	+14.171447	1993.530	17.40	0.43	19.13	0.43	3	4.61	0.47

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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	0.703	18 25 18.02088	+14 10 25.2516	1041-0340300	276.325087	+14.173681	27	65	1975.7	0	0	5	19.69	17.21	18.94	17.17	16.95
2	8.516	18 25 18.28680	+14 10 17.3712	1041-0340304	276.326195	+14.171492	65	85	1975.7	4	8	5	19.27	17.48	18.68	17.24	16.66

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	0.700	18 25 18.020664	+14 10 25.25016	1041-0345765	YM	276.3250861	+14.1736806	B	0.0	0.0	0.0	0.0	18.940	B	17.880	Y	17.170	B	15.862	15.391	14.957
2	8.516	18 25 18.286656	+14 10 17.37012	1041-0345769	YM	276.3261944	+14.1714917	B	4.0	2.0	8.0	2.0	18.070	Y	17.270	Y	17.240	B	16.361	16.289	16.140

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

%22>%5cFONT SIZE=-1degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 0.73218 25 18.02880+14 10 25.1760N1PO042536276.325120+14.1736601993.53017.5719.4618.0916.750 2.82 0.12 2 8.68518 25 18.29112+14 10 17.2128N1PO042426276.326213+14.1714481993.53017.4019.1318.0117.033 4.61 0.47 3 9.61918 25 18.64032+14 10 26.4576N1PO042550276.327668+14.1740161990.483  21.27    3 1.60 0.37 %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	0.411	18 25 18.01296	+14 10 24.9492	276.325054	+14.173597	-3.7	-9.2	15.862	14.957	19.69	18.94	17.21	17.17	16.95	6	0
2	8.887	18 25 18.30168	+14 10 17.0688	276.326257	+14.171408	8.7	-0.3	16.362	16.140	19.27	18.68	17.48	17.24	16.66	6	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 [****ClosingBrace(s)Inserted****]
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Vmag

%20

%22>%5cFONT SIZE=-1magNmag
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 0.33918 25 18.01008+14 10 24.8809XPM 208-0460133276.325042+14.173578 -7.14 -9.82 -7.04 -9.8317.56819.45818.09116.74515.862 0.09115.392 0.12614.957 0.132101530354918.917.2 51149.64754500M 2 9.65618 25 18.34007+14 10 16.5072XPM 208-0460142276.326417+14.171252 17.34 -10.97 17.44 -10.9817.40419.13418.01417.03216.362 0.16316.289 0.26316.140 0.364101530356318.717.5 51149.64754500M %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%0a%25%25%25%20Introduction%20to%20UCAC4%20VizieR%20page%0a%3cEM%3e%25Note:%20%0a%20%20see%20the%20UCAC4%20document,%20and%20the%0a%20%20the%20fix%20for%20high%20proper%20motion%20stars.%0a%20%20The%20UCAC%20home%20page%20is%20available%20at%0a%20%20http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/ucac.%0a%20%20%3cBR%3ePlease%20%3cB%3eacknowledge%20the%20usage%0a%20%20of%20the%20UCAC4%0a%0a%25%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	UCAC4	RAJ2000 deg	DEJ2000 deg	ePos mas	f.mag mag	of	db	pmRA mas/yr	pmDE mas/yr	Jmag mag	Kmag mag	Bmag mag	Vmag mag	rmag mag	imag mag	H	A	b	h	Z	B	L	N	S
1	9.776	18 25 18.464208	+14 10 17.78412	521-075344	276.3269342	+14.1716067	122	16.224	0	0	48.2	18.6	16.362	16.140					0	0	0	0	0	0	0	1	0

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