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	5.011	02 35 18.39672	-06 26 26.9016	0825-00603717	038.826653	-06.440806			19.3	18.9	1954.903
2	5.212	02 35 18.38136	-06 26 27.9600	0825-00603715	038.826589	-06.441100			19.4	18.7	1954.903

%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	4.372	02 35 18.35472	-06 26 26.7612	0835-0024481	038.826478	-06.440767	255	694	1976.8	0	0	5	20.30	19.69	20.19	19.74	18.59
2	6.297	02 35 18.38472	-06 26 29.7312	0835-0024482	038.826603	-06.441592	253	999	1968.8	0	0	2	20.98		20.20
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%206.297&%3cFONT%20COLOR=%27#CD5B45%27>02%2035%2018.38472&%3cFONT%20COLOR=%27#CD5B45%27>-06%2026%2029.7312&0835-0024482&038.826603&-06.441592&253&999&1968.8&%20%20%20%20%200&%20%20%20%20%200&2&20.98&%20&20.20&%20&%20%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	4.371	02 35 18.354672	-06 26 26.76012	0835-0024699	..	038.8264778	-06.4407667	B	0.0	0.0	0.0	0.0	20.190	B			19.740	B
2	6.296	02 35 18.384672	-06 26 29.73012	0835-0024700	..	038.8266028	-06.4415917	B	0.0	0.0	0.0	0.0	20.200	B

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20This%20version%20of%20the%20%0a%3cB%3eGSC-II%0ahas%20no%20proper%20motions,%20but%20the%20limits%20on%20brightness%20which%20existed%20on%0a%20%28F<18.5,%20B_j<19.5%29%20were%20removed.%0a%25The%20data%20are%20%3cB%3e%3cFONT%20COLOR=%27#0000CD%27>copyrighted,%20check%0a%25the%20%3cB%3edata%20use%20Policy.%0a%3cP%3e%0a

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

Fmag

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

a
pixe

1 3.99502 35 18.32424-06 26 26.9160S0F9003158038.826351-06.4408101997.73719.6019.76    3 1.93 0.13 %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	4.357	02 35 18.36648	-06 26 25.1340	038.826527	-06.440315	9.4	34.5			20.30	20.19	19.69		18.59	4	0
2	4.399	02 35 18.37008	-06 26 25.5084	038.826542	-06.440419	-0.6	90.8			20.98	20.20				2	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	[****ClosingBrace(s)Inserted****]
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mag&%">\BegDIVclass='sort-down ' </A>dece_
magmagGrvs
mage_
magalphaEpoch
yrdeltaEpoch
yrpmRA
mas/yre_
(...)pmDE
mas/yre_
(...) 1 4.35602 35 18.36645-06 26 25.1340038.826527-06.440315 0.115 0.11520.190 0.40019.690 0.40019.808 0.40019.345 0.5001971.56001971.5600 9.4 6.7 34.5 6.7 2 4.79002 35 18.35129-06 26 27.8939038.826464-06.441082 0.124 0.12619.763 0.30019.600 0.30019.009 0.09618.120 0.1222006.88002006.8800 -0.6 11.7 90.8 11.7 %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	4.166	02 35 18.2746827184	-06 26 26.620179835	038.82642830048	-06.44073365183	20.593632	101.519	56.994	-29.816	81.535	5.07185e-01		-2.097	61.860	5.710	63.480	1.36440e-02		4	0	PS1	Gaia	DR9+DR12	Sloan	2M
2	4.559	02 35 18.3306207260	-06 26 27.403659660	038.82645291837	-06.44096747780	20.776045	26.948	53.604	26.948	53.604	8.56272e-01		-7.926	52.364	-7.926	52.364	3.25188e-01		3	0	PS1	Gaia	DR9+DR12	Sloan	2M

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