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	0.625	01 07 38.95680	+17 04 16.8024	1050-00310954	016.912320	+17.071334			19.6	19.7	1954.761
2	1.335	01 07 38.88816	+17 04 17.1516	1050-00310949	016.912034	+17.071431			19.6	19.3	1954.761

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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	1.101	01 07 38.95344	+17 04 17.2812	EO1251-0213116	016.912306	+17.071467	19.84		2	7.12	5.4	0.66	21.24		1	5.36	4.9	1.40
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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	0.525	01 07 38.91552	+17 04 16.1868	N32333016620	016.912148	+17.071163	1993.771			19.23	0.25	3	3.87	0.54

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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	0.416	01 07 38.92536	+17 04 16.3416	1070-0011370	016.912189	+17.071206	246	383	1973.5	0	0	4	20.11	19.80	20.93	23.05
2	4.327	01 07 38.69616	+17 04 18.4728	1070-0011369	016.911234	+17.071798	310	726	1966.5	-58	30	3	20.85	19.41		20.11
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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	0.416	01 07 38.925336	+17 04 16.34016	1070-0011487	..	016.9121889	+17.0712056	B	0.0	0.0	0.0	0.0	20.930	B			23.050	B
2	4.327	01 07 38.695992	+17 04 18.46992	1070-0011486	..	016.9112333	+17.0717972	B	-58.0	8.0	30.0	19.0	20.850	o			20.110	B

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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 0.84101 07 38.98464+17 04 15.4812NBU9006620016.912436+17.0709671990.96520.1219.23    3 2.06 0.60 %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	0.588	01 07 38.91168	+17 04 16.0788	016.912132	+17.071133	-7.0	-14.1			20.11	20.93	19.80	23.05		4	0
2	4.019	01 07 38.70720	+17 04 18.1344	016.911280	+17.071704	-54.8	16.9			20.85		19.41	20.11		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_
(...)

1 0.33101 07 38.96341+17 04 15.8922016.912348+17.071081 0.036 0.05219.227 0.30020.117 0.30020.203 0.10019.406 0.1252008.75002008.7500 -7.0 6.1 -14.1 6.1 2 3.62701 07 38.73825+17 04 18.1182016.911409+17.071700 0.055 0.06720.850 0.40020.110 0.40020.925 0.12820.040 0.1482008.75002008.7500 -54.8 7.7 16.9 7.7 %0a%0a%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2	RA_ICRS deg	DE_ICRS deg	objID	Epoch yr	Class	Gmag mag	OMag mag	Bjmag mag	Fpgmag mag	Epgmag mag	Npgmag mag	Umag mag	Bmag mag	Vmag mag	umag mag	gmag mag	rmag mag	imag mag	zmag mag	ymag mag	Jmag mag	Hmag mag	Ksmag mag	Zmag mag	Ymag mag	W1mag mag	W2mag mag	W3mag mag	W4mag mag	FUVmag mag	NUVmag mag	a pix	e pix	PA pix
1	0.402	01 07 38.9558439894	+17 04 16.151734827	NBU9006620	016.91230921000	+17.07104980000	132333016620	2013.047	3		20.817600	19.227600	20.117500						21.729	20.992	20.862	20.777	20.667													2.061	0.598	13.9
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1	0.402	01 07 38.9558439894	+17 04 16.151734827	NBU9006620	016.91230921000	+17.07104980000	132333016620	2013.047	3		20.817600	19.227600	20.117500						21.729	20.992	20.862	20.777	20.667													2.061	0.598	13.9

%22>\Ahref='VizieR-5?-ref=VIZ66430e59347867&-out.add=.&-source=I/353/gsc242&-c=016.91222532000%20%2b17.07090080000,eq=ICRS,rs=2&-out.orig=o' class='full'2 0.97301 07 38.9340768000+17 04 15.242880000NBU9032294016.91222532000+17.07090080000 13233301322942011.6653                    20.77420.51420.743                      21.79522.336       3 4.06501 07 38.7125160000+17 04 18.353640000NBU9024678016.91130215000+17.07176490000 13233301246782013.0843                  22.95121.67921.48521.24621.162                               4 8.73101 07 39.4871030770+17 04 19.641359558NBU9036871016.91475360000+17.07177940000 13233301368712010.5604                                        16.96616.92312.596 8.479           %0a%0a%0a%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20SDSS%20is%20also%20available%20from%20http://www.sdss.org/%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	mode	cl	SDSS	m_	zsp	umag mag	e_ mag	gmag mag	e_ mag	rmag mag	e_ mag	imag mag	e_ mag	zmag mag	e_ mag	RA_ICRS deg	DE_ICRS deg	ObsDate yr	Q
1	0.436	01 07 38.96006	+17 04 15.8307	1	3	J010738.96+170415.7			21.465	0.182	20.674	0.033	20.254	0.032	19.993	0.041	19.846	0.115	016.912339	+17.071046	2004.6526	2
2	4.033	01 07 38.73390	+17 04 18.2803	1	3	J010738.71+170418.4			23.534	0.911	21.539	0.061	20.962	0.051	20.708	0.068	20.692	0.218	016.911325	+17.071782	2004.6526	2

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