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	3.833	01 26 01.54344	+03 43 36.0228	0900-00337486	021.506431	+03.726673			16.6	16.7	1954.679

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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	3.372	01 26 01.57488	+03 43 35.4000	EO1259-0007107	021.506562	+03.726500	17.41		1	2.15	12.2	0.09	18.23		1	16.52	12.1	0.82
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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	3.321	01 26 01.57704	+03 43 35.7456	N32320332503	021.506571	+03.726596	1987.651	16.38	0.43	15.93	0.44	3	5.04	0.14

%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	3.585	01 26 01.56336	+03 43 36.4008	0937-0020238	021.506514	+03.726778	152	322	1976.1	-8	28	5	16.56	18.97	15.97	15.97	15.57
2	4.540	01 26 01.65408	+03 43 39.7416	0937-0020239	021.506892	+03.727706	999	728	1968.4	76	86	3	20.02	18.65			18.55
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%204.540&%3cFONT%20COLOR=%27#CD5B45%27>01%2026%2001.65408&%3cFONT%20COLOR=%27#CD5B45%27>%2b03%2043%2039.7416&0937-0020239&021.506892&%2b03.727706&999&728&1968.4&%20%20%20%2076&%20%20%20%2086&3&20.02&18.65&%20&%20&18.55%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	3.585	01 26 01.563336	+03 43 36.40008	0937-0020368	Y.	021.5065139	+03.7267778	B	-8.0	5.0	28.0	10.0	17.790	Y	17.900	Y	15.970	B
2	4.539	01 26 01.654008	+03 43 39.74016	0937-0020369	..	021.5068917	+03.7277056	B	76.0	27.0	86.0	19.0	20.020	o			18.650	e

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

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

a
pixe

1 3.31701 26 01.57728+03 43 35.7492NBRJ002503021.506572+03.7265971987.65116.3815.9317.8716.643 5.04 0.14 %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	3.513	01 26 01.56744	+03 43 36.3324	021.506531	+03.726759	-5.3	18.9			16.56	15.97	18.97	15.97	15.57	5	0
2	4.327	01 26 01.66176	+03 43 39.5616	021.506924	+03.727656	85.6	72.0			20.02		18.65		18.55	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 [****ClosingBrace(s)Inserted****]
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magG

%20

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

magGrvs
mag

e_
mag

alphaEpoch
yr

deltaEpoch
yr

pmRA
mas/yr

e_
(...)

pmDE
mas/yr

e_
(...)

1 3.24401 26 01.58220+03 43 35.7756021.506593+03.726604 0.400 0.40015.934 0.30016.379 0.30016.229 0.40016.494 0.5001987.65001987.6500 6.2 4.3 2.5 17.8 2 3.37001 26 01.57391+03 43 35.6456021.506558+03.726568 0.064 0.11615.970 0.40015.970 0.40017.396 0.08116.532 0.1112008.77002008.7700 -5.3 5.8 18.9 5.8 3 4.32701 26 01.66174+03 43 39.5621021.506924+03.727656 0.133 0.13320.020 0.40018.650 0.40018.891 0.40017.811 0.5001968.45001968.4500 85.6 6.9 72.0 6.9 %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	3.431	01 26 01.570272	+03 43 35.99193	021.5065428	136.00	+03.7266644	208.00	64399+0002503	4	-5.1	4.1	-0.1	6.3	8	41.043	16.379	15.934	16.637	17.866

%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