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	4.375	18 28 48.05724	+50 22 20.8746	+50.0401	18 27 34.293	+50 20 17.88	15.03	1	0	0	0	18 28 48.057	+50 22 20.87

%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 3.947 18 28 48.18408 +50 22 20.2404 1350-09700200 277.200767 +50.372289     10.9 10.1 1953.524 2 5.660 18 28 48.84144 +50 22 19.3404 1350-09700318 277.203506 +50.372039     16.8 15.9 1953.524 3 5.719 18 28 47.92416 +50 22 20.3628 1350-09700152 277.199684 +50.372323     10.9 9.7 1950.383 4 7.642 18 28 49.21344 +50 22 24.9024 1350-09700384 277.205056 +50.373584     18.2 17.0 1950.383 [****ClosingBrace(s)Inserted****] "> %3cEM%3e4&%3cFONT%20COLOR=%27#CD5B45%27>%207.642&%3cFONT%20COLOR=%27#CD5B45%27>18%2028%2049.21344&%3cFONT%20COLOR=%27#CD5B45%27>%2b50%2022%2024.9024&1350-09700384&277.205056&%2b50.373584&%20&%20&18.2&17.0&1950.383%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663dab903e0237&-out.add=.&-source=I/252/out&USNO-A2.0===1350-09700407&-out.orig=o' class='full'5	8.503	18 28 49.31880	+50 22 23.3112	1350-09700407	277.205495	+50.373142			18.5	17.7	1953.524

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)

Full	_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	3.81	18 28 48.1128	+50 22 21.108	0353400713	277.20047	+50.37253	0.3	12.68	0.40	1	3	00TB	1983.349
2	3.90	18 28 48.0768	+50 22 21.468	0353400713	277.20032	+50.37263	0.3	13.14	0.40	1	3	02RV	1983.374

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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	4.01	18 28 48.1032	+50 22 20.892	0353400713	277.20043	+50.37247	0.3	13.16	0.40	1	3	1983.374
2	4.27	18 28 48.1032	+50 22 20.496	0353400713	277.20043	+50.37236	0.3	12.70	0.41	1	3	1983.349

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">  _r
arcsec _RAJ2000
"h:m:s" _DEJ2000
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RAJ2000
degDEJ2000
degrmag
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rClass

rStel

rDiam
arcsecrEll

bmag
magl_

bClass

bStel

bDiam
arcsecb-r
magMflag

1 3.60118 28 48.21072+50 22 20.4816EO0130-0050524277.200878+50.372356 8.25   1 4.76 57.4 0.4110.19   1 7.37 55.2 1.94   2 4.10718 28 48.13200+50 22 20.4528EO0770-0049640277.200550+50.372348 9.32  -1 2.47 44.7 0.2610.64   1 6.93 41.9 1.32   %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	4.439	18 28 48.05664	+50 22 20.7732	N0110322242	277.200236	+50.372437	1991.600	9.64	0.43	10.67	0.42	3	16.31	0.18

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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	4.229	18 28 48.09144	+50 22 20.6904	1403-0311705	277.200381	+50.372414	123	153	1972.9	-22	10	4	10.91	9.91	10.16		9.02
2	4.972	18 28 47.95416	+50 22 21.4104	1403-0311704	277.199809	+50.372614	76	377	1964.1	8	22	3	10.88	9.58		9.13
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%204.972&%3cFONT%20COLOR=%27#CD5B45%27>18%2028%2047.95416&%3cFONT%20COLOR=%27#CD5B45%27>%2b50%2022%2021.4104&1403-0311704&277.199809&%2b50.372614&%2076&377&1964.1&%20%20%20%20%208&%20%20%20%2022&3&10.88&%209.58&%20&%209.13&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663dab903e0237&-out.add=.&-source=I/284/out&USNO-B1.0===1403-0311712&-out.orig=o' class='full'3 6.87118 28 48.92616+50 22 18.44041403-0311712277.203859+50.3717894213141967.1 20 -22317.5615.65    15.96 4 7.63818 28 49.19544+50 22 25.58281403-0311717277.204981+50.3737731569301965.0 0 0318.9816.92    16.54 5 8.86118 28 49.31688+50 22 20.85241403-0311718277.205487+50.372459999 731979.8 -10 -543  17.55  16.8516.73 %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	4.230	18 28 48.091344	+50 22 20.69004	1403-0315740	..	277.2003806	+50.3724139	B	-22.0	3.0	10.0	4.0	10.160	B			9.910	e
2	4.974	18 28 47.953992	+50 22 21.41004	1403-0315739	YM	277.1998083	+50.3726139	B	8.0	1.0	22.0	9.0	14.420	o	13.430	Y	9.130	B	13.371	12.500	12.310
3	6.870	18 28 48.925992	+50 22 18.44004	1403-0315747	..	277.2038583	+50.3717889	B	20.0	11.0	-22.0	8.0	17.560	o			15.650	e
4	7.636	18 28 49.195344	+50 22 25.57992	1403-0315752	..	277.2049806	+50.3737722	B	0.0	0.0	0.0	0.0	18.980	o			16.920	e
5	8.859	18 28 49.316664	+50 22 20.84988	1403-0315753	..	277.2054861	+50.3724583	B	-10.0	39.0	-54.0	2.0					16.850	B

%0a%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