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	6.458	17 56 44.06400	+41 46 38.9604	1275-09664961	269.183600	+41.777489			16.1	15.3	1951.645
2	8.297	17 56 42.92736	+41 46 36.1308	1275-09664765	269.178864	+41.776703			17.3	18.1	1951.645

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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 [****ClosingBrace(s)Inserted****]
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Mflag

%22> 1 4.38617 56 43.84152+41 46 38.6112EO0324-0221541269.182673+41.77739214.64   2 17.03 24.5 0.6315.57   2 22.61 28.2 0.93   %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	6.094	17 56 44.04240	+41 46 39.3960	N101003119588	269.183510	+41.777610	1988.468			16.17	0.43	0	4.32	0.07
2	7.911	17 56 42.95208	+41 46 36.4044	N101003119589	269.178967	+41.776779	1988.468			17.56	0.43	3	6.69	0.38

%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	5.703	17 56 43.04808	+41 46 38.9604	1317-0321647	269.179367	+41.777489	999	999	1978.8	0	0	3	20.91		18.82		18.83
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%205.703&%3cFONT%20COLOR=%27#CD5B45%27>17%2056%2043.04808&%3cFONT%20COLOR=%27#CD5B45%27>%2b41%2046%2038.9604&1317-0321647&269.179367&%2b41.777489&999&999&1978.8&%20%20%20%20%200&%20%20%20%20%200&3&20.91&%20&18.82&%20&18.83%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663e809018d4b4&-out.add=.&-source=I/284/out&USNO-B1.0===1317-0321655&-out.orig=o' class='full'2 5.74017 56 44.01888+41 46 39.78121317-0321655269.183412+41.777717130 751976.1 -8 16516.4815.2615.9715.3715.15 3 7.94617 56 42.93936+41 46 36.54121317-0321646269.178914+41.776817 392401976.1 6 6517.8617.7816.8216.1917.68 %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20Naval%20Observatory%20Merged%20Astrometric%20Dataset%20%28NOMAD%29%20contains%0aastrometric%20and%20photometric%20data%20for%20over%201%20billion%20stars%20derived%20from%0athe%20Hipparcos%20%28I/239%29,%20Tycho-2%20%28I/259%29,%20UCAC2%20%28I/289%29,%20and%20USNO-B1.0%0a%28I/284%29%20catalogs%20for%20astrometry%20and%20optical%20photometry,%20supplemented%0aby%202MASS%20%28II/246%29%20near-infrared%20photometry.%3cBR%3e%0a%3cFONT%20SIZE=%27-1%27%3eAn%20efficient%20remote%20query%20program%20%3cB%3efindnomad1%20is%0aavailable%20in%20the%20cdsclient%20%0apackage,%20for%20Unix/Linux%20platforms%0a%3cP%3e%0a

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	5.704	17 56 43.048008	+41 46 38.96004	1317-0325728	..	269.1793667	+41.7774889	B	0.0	0.0	0.0	0.0	18.820	B
2	5.738	17 56 44.018664	+41 46 39.78012	1317-0325736	YM	269.1834111	+41.7777167	B	-8.0	4.0	16.0	2.0	15.740	Y	15.530	Y	15.370	B	14.369	14.028	13.961
3	7.947	17 56 42.939336	+41 46 36.54012	1317-0325727	..	269.1789139	+41.7768167	B	6.0	1.0	6.0	7.0	16.820	B			16.190	B

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20Zone%20-30/%2b50deg%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC14 [****ClosingBrace(s)Inserted****]
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CMC14

%20

%22>f_

RAICRS
deg

DEICRS
deg

r'mag
mag

Nt

Jmag
mag

Hmag
mag

Ksmag
mag

1 5.95417 56 44.03496+41 46 39.6192175644.0+414639  269.183479+41.77767215.602 114.37014.02813.962 %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 mag	jmag mag	Vmag mag	Nmag mag	Class	a pix	e
1	6.096	17 56 44.04264	+41 46 39.3960	N3D9019588	269.183511	+41.777610	1988.468		16.17	15.50	15.00	0	4.32	0.07
2	7.911	17 56 42.95208	+41 46 36.4044	N3D9019589	269.178967	+41.776779	1988.468		17.56	18.46	17.96	3	6.69	0.38

%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 [****ClosingBrace(s)Inserted****]
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fl

%20

%22> 1 5.04317 56 43.11000+41 46 39.0216269.179625+41.777506 87.3 -17.3    20.9118.82    18.83 3 0 2 5.97317 56 44.03784+41 46 39.6660269.183491+41.777685 -5.0 13.714.37013.96216.4815.9715.2615.3715.15 6 0 3 8.03817 56 42.94248+41 46 36.3360269.178927+41.776760 3.7 -1.1    17.8616.8217.7816.1917.68 5 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 mag	Nmag 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	6.031	17 56 44.04430	+41 46 39.7164	XPM 263-0432420	269.183518	+41.777699	-4.69	16.98	-4.32	17.30					14.370	0.025	14.028	0.040	13.962	0.048	615889841	16.1	15.3	229	47.625915	0	0	M

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	UCAC4	RAJ2000 [****ClosingBrace(s)Inserted****]
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RAJ2000

%20

%22>%5cFONT SIZE=-1degDEJ2000
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 6.00517 56 44.040072+41 46 39.63504659-063054269.1835003+41.7776764 7915.7600 0 2.6 10.414.37013.96216.38815.74315.51515.307000000010 %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"	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 (...)	e_DEJ2000 arcsec	magBJ mag	e_ mag	magRF mag	e_ mag	magG mag	e_ mag	magGrvs mag	e_ mag	alphaEpoch yr	deltaEpoch yr	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)
1	6.005	17 56 44.04007	+41 46 39.6348	269.183500	+41.777676	0.045	0.065	16.166	0.300	15.370	0.400	15.518	0.080	14.653	0.110	1983.8900	1983.8900	2.6	4.3	10.4	4.7
2	8.135	17 56 42.93228	+41 46 36.3282	269.178885	+41.776758	0.096	0.108	17.563	0.300	16.190	0.400	17.296	0.082	16.474	0.111	2002.7500	2002.7500	3.7	5.1	-1.1	5.1

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20Zone%20-40/%2b50deg%3cP%3e%0a