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	3.888	17 13 18.05400	+43 46 59.4300	1275-09244255	258.325225	+43.783175			10.7	9.8	1954.515
2	11.035	17 13 18.07608	+43 47 11.9112	1275-09244258	258.325317	+43.786642			14.5	17.0	1954.515
3	23.522	17 13 17.82408	+43 47 24.9720	1275-09244216	258.324267	+43.790270			18.6	17.6	1954.515
4	25.548	17 13 18.15552	+43 46 36.3000	1275-09244266	258.325648	+43.776750			17.3	16.7	1954.515
5	27.412	17 13 16.92144	+43 47 27.3732	1275-09244112	258.320506	+43.790937			19.6	19.1	1954.515

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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	Plate	Epoch yr
1	5.56	17 13 18.0792	+43 46 57.216	0308500037	258.32533	+43.78256	0.3	12.55	0.40	1	3	009J	1982.390

%0a%22>ts_init('!ext/gsc1.2.exe_2');">\Endscript

Note: The GSC-ACT (or GSC1.3) is a recalibration of the GSC1.1, the catalogue constructed to support the operational need of the Hubble Space Telescope, with the ACT, the combination of the Astrographic Catalogue and the Tycho catalogue derived from the Hipparcos mission; see http://www.projectpluto.com/gsc_act.htm for more details about this recalibration.

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	5.65	17 13 18.0840	+43 46 57.144	0308500037	258.32535	+43.78254	0.3	12.56	0.40	1	3	1982.390

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cB%3e%3cFONT%20COLOR=%27#CD5B45%27>%20The%20current%20version%20includes%20only%20the%20North%20%28POSS-I%20plates%29%3cP%3e%0a

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	6.181	17 13 18.09072	+43 46 56.5212	EO1135-0054879	258.325378	+43.782367	8.32		1	3.75	68.8	0.60	9.87		2	0.75	67.9	1.55
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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	5.762	17 13 18.06072	+43 46 56.8020	N1320332386	258.325253	+43.782445	1991.453	9.23	0.35	10.35	0.35	0	27.32	0.63

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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	5.739	17 13 18.06216	+43 46 56.8416	1337-0280248	258.325259	+43.782456	90	542	1973.0	4	-58	4	10.84	9.79	10.35		9.37
2	8.965	17 13 18.17472	+43 46 53.7816	1337-0280251	258.325728	+43.781606	116	929	1978.8	128	-430	3		16.91	10.21	9.90
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">

%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%208.965&%3cFONT%20COLOR=%27#CD5B45%27>17%2013%2018.17472&%3cFONT%20COLOR=%27#CD5B45%27>%2b43%2046%2053.7816&1337-0280251&258.325728&%2b43.781606&116&929&1978.8&%20%20%20128&%20%20-430&3&%20&16.91&10.21&%209.90&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663c2135ce4be&-out.add=.&-source=I/284/out&USNO-B1.0===1337-0280244&-out.orig=o' class='full'3 9.83217 13 17.94072+43 47 11.07241337-0280244258.324753+43.7864093109251973.4 0 0214.97      12.73 414.32317 13 18.05208+43 47 15.40321337-0280247258.325217+43.7876129999991972.5 0 0219.30  16.65     514.70117 13 17.89944+43 47 16.07281337-0280243258.324581+43.7877989992611966.5 -38 90314.9216.5714.37     617.43517 13 17.64408+43 47 18.86281337-0280239258.323517+43.7885735147891978.8 54 32319.23  16.9816.54   718.26517 13 18.01416+43 47 19.50001337-0280245258.325059+43.7887509999991973.0 0 0420.1816.4517.04  17.49 819.12317 13 17.55480+43 47 20.47201337-0280237258.323145+43.7890209992231979.1 -230 -310321.51  16.95  17.81 919.52317 13 17.89536+43 47 20.92201337-0280242258.324564+43.7891459995351978.8 -26 803  16.9516.7614.21   1021.07317 13 18.16608+43 46 40.88281337-0280250258.325692+43.7780236063391972.5 0 02  11.2811.46     1121.28917 13 18.59472+43 46 42.25081337-0280255258.327478+43.7784039999811991.4 0 03    15.9517.9916.34 1221.46617 13 17.80800+43 47 22.92001337-0280240258.324200+43.7897002266211976.6 0 0518.8317.6615.1015.4316.71 1323.16217 13 17.82144+43 47 24.61201337-0280241258.324256+43.7901701693801972.9 0 0219.52    16.01   1424.92317 13 18.03216+43 46 36.73201337-0280246258.325134+43.7768701416391967.1 -24 10318.0616.37    15.75 1525.69317 13 18.14736+43 47 26.79001337-0280249258.325614+43.7907759993891972.5 0 0220.74  20.32     1627.11417 13 18.55080+43 46 35.78161337-0280254258.327295+43.7766061664841972.9 0 0218.52    16.85   1727.38917 13 16.88808+43 47 27.22201337-0280236258.320367+43.790895 901471972.7 0 0420.8019.3618.4718.73   1828.93817 13 16.37208+43 47 26.27161337-0280235258.318217+43.7906313461991991.0 0 02    21.5319.67   1929.72717 13 18.53352+43 46 32.98081337-0280253258.327223+43.7758282465061979.4 44 03  17.36  16.9716.94 %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	3.913	17 13 18.061992	+43 47 03.40008	1337-0284113	YM	258.3252583	+43.7842778	Y	-9.1	9.0	-30.1	9.0			14.800	Y			13.798	14.580	12.862
2	5.740	17 13 18.061992	+43 46 56.84016	1337-0284112	YM	258.3252583	+43.7824556	B	4.0	2.0	-58.0	16.0	14.580	Y	13.580	Y	9.790	e	13.127	12.830	12.589
3	6.083	17 13 18.131328	+43 47 05.91000	1337-0284114	YM	258.3255472	+43.7849750	Y	24.5	9.0	-148.7	9.0			16.210	Y			15.269	13.500	13.163
4	8.966	17 13 18.174672	+43 46 53.78016	1337-0284117	..	258.3257278	+43.7816056	B	128.0	4.0	-430.0	34.0	10.210	B			9.900	B
5	9.830	17 13 17.940672	+43 47 11.06988	1337-0284107	..	258.3247528	+43.7864083	B	0.0	0.0	0.0	0.0	14.970	o
6	9.888	17 13 18.046656	+43 46 52.11984	1337-0284110	YM	258.3251944	+43.7811444	Y	36.1	9.0	499.9	9.0	17.030	Y	17.020	Y			13.502	13.846	13.502
7	14.320	17 13 18.052008	+43 47 15.39996	1337-0284111	..	258.3252167	+43.7876111	B	0.0	0.0	0.0	0.0	16.650	B
[****ClosingBrace(s)Inserted****]
7	14.320	17 13 18.052008	+43 47 15.39996	1337-0284111	..	258.3252167	+43.7876111	B	0.0	0.0	0.0	0.0	16.650	B

%22>\Ahref='VizieR-5?-ref=VIZ663c2135ce4be&-out.add=.&-source=I/297/out&NOMAD1===1337-0284106' class='full'814.69817 13 17.899344+43 47 16.069921337-0284106..258.3245806+43.7877972B -38.0 26.0 90.0 6.014.370B    16.570e         917.43217 13 17.644008+43 47 18.859921337-0284102..258.3235167+43.7885722B 54.0 18.0 32.0 28.016.980B    16.540B         1018.26517 13 18.013992+43 47 19.500001337-0284108..258.3250583+43.7887500B 0.0 0.0 0.0 0.017.040B    16.450e         1119.12117 13 17.554656+43 47 20.469841337-0284100..258.3231444+43.7890194B -230.0 47.0 -310.0 8.016.950B                 1219.52117 13 17.895336+43 47 20.919841337-0284105..258.3245639+43.7891444B -26.0 46.0 80.0 19.016.760B    14.210B         1321.07617 13 18.166008+43 46 40.879921337-0284116..258.3256917+43.7780222B 0.0 0.0 0.0 0.011.460B    11.280e         1421.29017 13 18.594672+43 46 42.250081337-0284121..258.3274778+43.7784028B 0.0 0.0 0.0 0.015.950B    17.990B         1521.46617 13 17.808000+43 47 22.920001337-0284103..258.3242000+43.7897000B 0.0 0.0 0.0 0.015.100B    15.430B         1623.15917 13 17.821344+43 47 24.609841337-0284104..258.3242556+43.7901694B 0.0 0.0 0.0 0.019.520o    16.010B         1724.92517 13 18.031992+43 46 36.729841337-0284109..258.3251333+43.7768694B -24.0 3.0 10.0 17.018.060o    16.370e         1825.69317 13 18.147336+43 47 26.790001337-0284115..258.3256139+43.7907750B 0.0 0.0 0.0 0.020.320B                 1927.11517 13 18.550656+43 46 35.780161337-0284120..258.3272944+43.7766056B 0.0 0.0 0.0 0.018.520o    16.850B         2027.38817 13 16.888008+43 47 27.219841337-0284099..258.3203667+43.7908944B 0.0 0.0 0.0 0.018.470B    18.730B         2128.93717 13 16.372008+43 47 26.270161337-0284098..258.3182167+43.7906306B 0.0 0.0 0.0 0.021.530B    19.670B         2229.72717 13 18.533328+43 46 32.980081337-0284119..258.3272222+43.7758278B 44.0 9.0 0.0 18.0        16.970B         %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	5.764	17 13 18.06096	+43 46 56.8020	N5Z2000386	258.325254	+43.782445	1991.453	9.23	10.35	9.92	9.29	3	27.32	0.63
2	26.763	17 13 16.92792	+43 47 26.7108	N5Z2021052	258.320533	+43.790753	1991.453	18.78	19.74		18.54	3	3.91	0.40

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%20The%20limiting%20magnitude%20is%20about%2015.2%20in%20the%20GSC%20photometric%20system.%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	PPMX	RAJ2000 deg	DEJ2000 deg	pmRA mas/yr	pmDE mas/yr	Cmag mag	Rmag mag	Jmag mag	Hmag mag	Kmag mag	Nobs	P	sub
1	5.710	17 13 18.02640	+43 46 56.6148	171318.0+434656	258.325110	+43.782393	-31.45	-22.25	12.550	14.183	13.127	12.830	12.590	2		O
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