The 5 columns in color are computed by VizieR, and are not part of the original data.

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	Name	RAB1950 "h:m:s"	DEB1950 "d:m:s"	bmag mag	Nfields	Flag1	Flag2	Flag3	_RA.icrs "h:m:s"	_DE.icrs "d:m:s"
1	0.701	01 31 38.84700	+18 14 41.5813	+17.0063	01 28 56.700	+17 59 16.19	16.45	2	0	0	0	01 31 38.847	+18 14 41.58

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%25

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 0.098 01 31 38.88072 +18 14 41.9532 1050-00417979 022.912003 +18.244987     12.7 11.6 1954.893 2 7.460 01 31 39.39816 +18 14 43.4832 1050-00418027 022.914159 +18.245412     19.5 18.5 1954.761 3 9.655 01 31 38.67744 +18 14 32.8416 1050-00417963 022.911156 +18.242456     19.6 19.0 1954.893 %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eGuide%20Star%20Catalog%20has%20been%20constructed%20to%20support%20the%20%0aoperational%20need%20of%20the%20Hubble%20Space%20Telescope.%0aIt%20contains%20over%2025%20million%20positions%20for%20about%2019%20million%0aobjects,%20of%20which%20more%20than%2015%20million%20are%20classified%20as%20stars.%0aThe%20version%20%3cB%3e1.2%20is%20a%20new%20astrometric%20reduction%20which%20results%20in%0aabsolute%20position%20errors%20about%200.3-0.4%20arcsec.%0a%28see%20GSC%20pages%20at%20URL%20http://www-gsss.stsci.edu/gsc/gsc.html%29%0a%3cP%3e%0a%0a%5b%2a%2a%2a%2aClosingBrace%28s%29Inserted%2a%2a%2a%2a%5d">
Note: The Guide Star Catalog has been constructed to support the operational need of the Hubble Space Telescope. It contains over 25 million positions for about 19 million objects, of which more than 15 million are classified as stars. The version 1.2 is a new astrometric reduction which results in absolute position errors about 0.3-0.4 arcsec. (see GSC pages at URL http://www-gsss.stsci.edu/gsc/gsc.html)
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\
TABULARCELLPADDING=5 CELLSPACING=2 class='tablist Vbgcol2'Lp0.80Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class	Plate	Epoch yr
1	0.32	01 31 38.8704	+18 14 41.784	0120100115	022.91196	+18.24494	0.3	14.57	0.40	1	0	00FG	1983.678
2	0.56	01 31 38.8728	+18 14 41.496	0120100115	022.91197	+18.24486	0.3	14.22	0.40	1	0	021K	1982.888

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eGSC-ACT%20%3cEM%3e%28or%20%3cB%3eGSC1.3%29%0ais%20a%20recalibration%20of%20the%20%3cB%3e<%25E%20I/220%7cGSC1.1>,%20the%20catalogue%20constructed%20%0ato%20support%20the%20operational%20need%20of%20the%20Hubble%20Space%20Telescope,%0awith%20the%20%3cB%3e<%25E%20I/246%7cACT>,%20the%20combination%20of%20the%20Astrographic%20Catalogue%0aand%20the%20%3cB%3e%3cEM%3eTycho%20catalogue%20derived%20from%20the%20%3cEM%3e<%25E%20I/239%7cHipparcos>%0amission;%20see%20http://www.projectpluto.com/gsc_act.htm%20for%20more%20details%0aabout%20this%20recalibration.%0a%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class	Epoch yr
1	0.37	01 31 38.8920	+18 14 41.676	0120100115	022.91205	+18.24491	0.3	14.59	0.40	1	0	1983.678
2	0.74	01 31 38.8392	+18 14 41.676	0120100115	022.91183	+18.24491	0.3	14.24	0.40	1	0	1982.888

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%22> Full

">  _r
arcsec _RAJ2000
"h:m:s" _DEJ2000
"d:m:s"APM-ID

RAJ2000
degDEJ2000
degrmag
magl_

rClass

rStel

rDiam
arcsecrEll

bmag
magl_

bClass

bStel

bDiam
arcsecb-r
magMflag

1 0.72701 31 38.83344+18 14 42.0432EO1275-0142516022.911806+18.24501210.56   2 33.87 27.5 0.2512.47   1 19.09 26.5 1.92   2 1.03801 31 38.81352+18 14 41.8020EO1251-0149291022.911723+18.24494510.66   2 42.33 27.7 0.2713.08   2 32.80 20.5 2.42   %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	0.310	01 31 38.87472	+18 14 41.7588	N3230312269	022.911978	+18.244933	1990.716	11.65	0.43	12.45	0.41	3	10.40	0.06

%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	0.508	01 31 38.85216	+18 14 41.8200	1082-0024234	022.911884	+18.244950	65	85	1975.9	0	0	5	13.31	11.60	11.73	11.22	10.68
2	2.662	01 31 38.98344	+18 14 44.2932	1082-0024236	022.912431	+18.245637	999	999	1972.7	0	0	2	19.24			11.17
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%202.662&%3cFONT%20COLOR=%27#CD5B45%27>01%2031%2038.98344&%3cFONT%20COLOR=%27#CD5B45%27>%2b18%2014%2044.2932&1082-0024236&022.912431&%2b18.245637&999&999&1972.7&%20%20%20%20%200&%20%20%20%20%200&2&19.24&%20&%20&11.17&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6629758e37d534&-out.add=.&-source=I/284/out&USNO-B1.0===1082-0024235&-out.orig=o' class='full'3 7.47801 31 38.90352+18 14 34.56241082-0024235022.912098+18.242934 239991971.2 0 02  18.4318.61     4 7.84401 31 39.41952+18 14 40.18201082-0024240022.914248+18.2444959999991972.3 0 0218.86    18.42   5 8.46801 31 39.47880+18 14 41.86321082-0024241022.914495+18.244962 525261979.8 22 -343  18.48  18.3018.80 6 8.49101 31 38.84688+18 14 33.56161082-0024233022.911862+18.242656 759991965.8 56 20319.6819.5918.88     %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	0.511	01 31 38.851992	+18 14 41.82000	1082-0024364	YM	022.9118833	+18.2449500	B	0.0	0.0	0.0	0.0	17.760	Y			11.220	B	14.135	13.478	13.064
2	2.639	01 31 39.012672	+18 14 40.13016	1082-0024367	YM	022.9125528	+18.2444806	Y	-78.9	9.0	-188.6	9.0			17.680	Y			15.343	13.015	12.670
3	2.658	01 31 38.983344	+18 14 44.28996	1082-0024366	..	022.9124306	+18.2456361	B	0.0	0.0	0.0	0.0	19.240	o			11.170	B
4	7.480	01 31 38.903328	+18 14 34.55988	1082-0024365	..	022.9120972	+18.2429333	B	0.0	0.0	0.0	0.0	18.610	B			18.430	e
5	7.842	01 31 39.419328	+18 14 40.17984	1082-0024371	..	022.9142472	+18.2444944	B	0.0	0.0	0.0	0.0	18.860	o			18.420	B
6	8.466	01 31 39.478656	+18 14 41.85996	1082-0024372	..	022.9144944	+18.2449611	B	22.0	1.0	-34.0	19.0					18.300	B
7	8.492	01 31 38.846664	+18 14 33.56016	1082-0024363	..	022.9118611	+18.2426556	B	56.0	2.0	20.0	31.0	18.880	B			19.590	e
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7	8.492	01 31 38.846664	+18 14 33.56016	1082-0024363	..	022.9118611	+18.2426556	B	56.0	2.0	20.0	31.0	18.880	B			19.590	e

%22>\EndTABLESORT

Note: This version of the GSC-II has no proper motions, but the limits on brightness which existed on GSC2.2 (F<18.5, B_j<19.5) were removed.