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	3.804	16 43 09.66480	+05 24 37.4904	0900-08891305	250.790270	+05.410414			18.7	17.4	1954.342

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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	2.805	16 43 09.70152	+05 24 38.3616	EO1056-0222432	250.790423	+05.410656	18.05		1	11.21	9.5	0.26	19.76		1	7.99	11.9	1.71
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%202.805&%3cFONT%20COLOR=%27#CD5B45%27>16%2043%2009.70152&%3cFONT%20COLOR=%27#CD5B45%27>%2b05%2024%2038.3616&EO1056-0222432&250.790423&%2b05.410656&18.05&%20&%201&%20%2011.21&%20%20%209.5&%200.26&19.76&%20&%201&%20%20%207.99&%20%2011.9&%20%201.71&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ66421ceb9c65b&-out.add=.&-source=I/267/out&APM-ID===EO0088-0224810&-out.orig=o' class='full'2 3.93916 43 09.62952+05 24 37.8900EO0088-0224810250.790123+05.41052518.07   1 8.19 9.1 0.2619.95   1 12.68 9.1 1.89   %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	3.513	16 43 09.66504	+05 24 37.9080	N10310111139	250.790271	+05.410530	1993.529	17.28	0.24	18.39	0.28	3	4.71	0.26

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eUSNO-B%20Catalog%20presents%20positions,%20proper%20motions,%20%0amagnitudes%20un%20blue,%20red%20and%20infrared,%20as%20well%20as%20star/galaxy%20estimators%0afor%201,045,175,762%20objects%20derived%20from%203,648,832,040%20separate%20observations.%0aThe%20data%20were%20taken%20from%20scans%20of%207,435%20Schmidt%20plates%0ataken%20from%20various%20sky%20surveys%20during%20the%20last%2050%20years.%3cBR%3e%0aUSNO-B1.0%20catalog%20was%20created%20by%20Dave%20Monet%20and%20collaborators%0aat%20http://www.nofs.navy.mil/data/fchpix/%20%3cBR%3e%0a%3cB%3e%3cFONT%20COLOR=%27#EE0000%27>%20Note%20that%20the%20star/galaxy%20estimators%20may%20be%20mixed%20up%0a%20in%20dense%20regions.%0a%3cP%3e%0a

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	3.255	16 43 09.64008	+05 24 39.0024	0954-0272106	250.790167	+05.410834	368	760	1952.3	0	0	2	19.89	17.68
2	3.475	16 43 09.65880	+05 24 38.0808	0954-0272107	250.790245	+05.410578	226	170	1977.8	0	18	5	19.53	17.60	18.39	16.89	17.35
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%203.475&%3cFONT%20COLOR=%27#CD5B45%27>16%2043%2009.65880&%3cFONT%20COLOR=%27#CD5B45%27>%2b05%2024%2038.0808&0954-0272107&250.790245&%2b05.410578&226&170&1977.8&%20%20%20%20%200&%20%20%20%2018&5&19.53&17.60&18.39&16.89&17.35%3cBR%3e">\EndTABLESORT

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	3.256	16 43 09.640008	+05 24 38.99988	0954-0276336	..	250.7901667	+05.4108333	B	0.0	0.0	0.0	0.0	19.890	o			17.680	e
2	3.477	16 43 09.658656	+05 24 38.08008	0954-0276337	..	250.7902444	+05.4105778	B	0.0	7.0	18.0	5.0	18.390	B			16.890	B

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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 3.50816 43 09.66528+05 24 37.9116N3T1001139250.790272+05.4105311993.52917.2818.3918.3417.413 4.71 0.26 %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	3.770	16 43 09.64056	+05 24 37.9512	250.790169	+05.410542	-10.4	11.0			19.53	18.39	17.60	16.89	17.35	5	0

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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 [****ClosingBrace(s)Inserted****]
">

Dt

%20

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

Bmag
mag

Nmag
mag

Vmag
mag

Jmag
mag

Hmag
mag

Kmag
mag

1 3.96816 43 09.654922+05 24 37.40407250.7902288 148.00+05.4103900 337.0054085+00011394 4.1 4.5 -5.8 10.2 947.142 17.284 18.393 17.406 18.340       %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"	RA_ICRS deg	DE_ICRS deg	rmag mag	pmRA mas/yr	e_ (...)	pmxRA mas/yr	e_ (...)	Chi2RA	pmGRA mas/yr	pmDE mas/yr	e_ (...)	pmxDE mas/yr	e_ (...)	Chi2DE	pmGDE mas/yr	Nobs	Flag	PS1	Gaia	DR9+DR12	Sloan	2M
1	3.663	16 43 09.6455089656	+05 24 37.938372056	250.79022730801	+05.41051690820	19.579361	13.507	8.518	13.044	8.533	2.60459e-01		-7.750	14.220	-22.864	21.421	2.93793e-02		5	0	PS1	Gaia	DR9+DR12	Sloan	2M

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