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	25.317	17 58 53.58000	+34 00 28.1628	1200-08804403	269.723250	+34.007823			17.6	16.7	1951.517
2	25.388	17 58 53.49744	+34 00 29.1816	1200-08804388	269.722906	+34.008106			17.2	16.6	1951.517
3	28.739	17 58 53.30280	+34 00 34.9200	1200-08804338	269.722095	+34.009700			18.1	16.7	1951.517
4	29.411	17 58 53.72952	+33 59 47.6520	1200-08804433	269.723873	+33.996570			17.8	16.5	1951.517
5	29.594	17 58 49.81752	+34 00 05.8716	1200-08803529	269.707573	+34.001631			17.2	15.9	1951.517

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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	12.38	17 58 51.7896	+34 00 21.240	0261601739	269.71579	+34.00590	0.8	13.22	0.40	1	3	037I	1982.387

%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	12.05	17 58 51.7968	+34 00 20.916	0261601739	269.71582	+34.00581	0.8	13.23	0.40	1	3	1982.387

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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	8.700	17 58 52.67352	+34 00 03.7116	EO0277-0375204	269.719473	+34.001031	19.66		1	6.51	6.8	0.61	22.25	L	0			2.59
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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	12.518	17 58 51.79968	+34 00 21.4380	N1010200610	269.715832	+34.005955	1993.609	9.12	0.43	9.84	0.42	0	26.49	0.54
2	29.720	17 58 53.75472	+33 59 47.5152	N10102003131	269.723978	+33.996532	1993.609	16.94	0.44	18.43	0.42	0	2.92	0.04

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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	12.745	17 58 51.86016	+34 00 21.9528	1240-0269862	269.716084	+34.006098	429	91	1982.0	0	0	4		9.08	9.70	8.72	8.64
[****ClosingBrace(s)Inserted****]
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>12.745&%3cFONT%20COLOR=%27#CD5B45%27>17%2058%2051.86016&%3cFONT%20COLOR=%27#CD5B45%27>%2b34%2000%2021.9528&1240-0269862&269.716084&%2b34.006098&429&%2091&1982.0&%20%20%20%20%200&%20%20%20%20%200&4&%20&%209.08&%209.70&%208.72&%208.64%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ66433cd814ea69&-out.add=.&-source=I/284/out&USNO-B1.0===1240-0269860&-out.orig=o' class='full'213.26817 58 51.67344+34 00 21.53161240-0269860269.715306+34.0059813432011978.5 0 0310.01   9.69 8.71   313.42317 58 51.74472+34 00 22.13281240-0269861269.715603+34.0061487795451972.5 0 0210.03     8.72   413.48617 58 51.13008+34 00 13.39201240-0269854269.713042+34.0037209449991982.0 -102 -144  15.52 9.8016.0215.71 513.64917 58 51.38736+34 00 19.32121240-0269856269.714114+34.0053674029991971.0 0 0210.05   9.63     616.31117 58 53.00472+34 00 22.47121240-0269871269.720853+34.0062423232991972.5 0 0218.04    16.45   716.63917 58 52.06872+34 00 26.41321240-0269865269.716953+34.0073374939991971.0 0 02  15.05 9.63     817.34217 58 50.78280+34 00 09.05041240-0269853269.711595+34.002514 998001972.0 0 0218.36      16.30 918.22917 58 51.44688+34 00 25.64281240-0269857269.714362+34.0071231025981979.2 326 112318.66    14.9215.45 1019.29017 58 52.85016+34 00 27.20161240-0269869269.720209+34.0075569999991972.0 0 02  15.16    14.38 1119.98217 58 50.57544+34 00 08.05321240-0269848269.710731+34.0022374979991972.0 0 0218.65      16.46 1222.81717 58 50.47008+34 00 18.23041240-0269845269.710292+34.0050644137781965.5 0 0317.6216.52  15.96   1323.47417 58 50.33616+34 00 15.08041240-0269843269.709734+34.004189 583741979.2 8 56317.75    16.0916.10 1424.84617 58 53.51136+34 00 28.31041240-0269878269.722964+34.0078647274301972.2 0 0418.3116.93  16.2416.27 1524.89217 58 50.18544+34 00 12.45241240-0269841269.709106+34.0034595892891979.2 0 03  17.00  16.4516.32 1624.90717 58 53.58072+34 00 27.58321240-0269880269.723253+34.007662 474661965.5 20 -30317.8116.82  16.51   1725.03717 58 53.36088+34 00 30.07081240-0269877269.722337+34.0083532859991972.0 0 02  15.62    16.29 1825.05717 58 53.05872+34 00 32.35321240-0269874269.721078+34.0089873896991972.0 0 02  16.80    15.93 1926.44017 58 53.67552+34 00 28.57321240-0269883269.723648+34.0079371162551972.5 0 02  17.57  17.34   2026.85117 58 50.06880+34 00 15.69241240-0269839269.708620+34.0043592919991965.5 0 0318.5818.31  16.64   2128.31617 58 53.66136+34 00 31.29121240-0269881269.723589+34.0086929999991972.5 0 02  18.11  16.70   2228.37917 58 53.56008+34 00 32.39281240-0269879269.723167+34.0089982943881982.0 0 04  17.3917.7716.7416.78 2329.14717 58 53.91000+34 00 29.44081240-0269884269.724625+34.0081789999991978.5 0 0320.71  19.7317.44   2429.18717 58 53.20680+34 00 36.05041240-0269875269.721695+34.0100148749991972.5 0 02  15.87  18.86   2529.39217 58 53.73816+33 59 47.77081239-0275104269.723909+33.996603104 391975.9 2 6518.6316.5818.6016.8116.32 2629.86717 58 49.79952+34 00 05.50081240-0269837269.707498+34.0015281472881975.9 0 0517.8816.0816.2015.8715.95 %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	12.743	17 58 51.859992	+34 00 21.94992	1240-0274030	..	269.7160833	+34.0060972	B	0.0	0.0	0.0	0.0	9.700	B			8.720	B
2	13.267	17 58 51.673344	+34 00 21.53016	1240-0274028	YM	269.7153056	+34.0059806	B	0.0	0.0	0.0	0.0	16.080	Y	14.330	Y	8.710	B	13.435	12.791	12.210
3	13.420	17 58 51.744672	+34 00 22.12992	1240-0274029	..	269.7156028	+34.0061472	B	0.0	0.0	0.0	0.0	10.030	o			8.720	B
4	13.486	17 58 51.130008	+34 00 13.38984	1240-0274022	..	269.7130417	+34.0037194	B	-102.0	37.0	-14.0	129.0	9.800	B			16.020	B
5	13.648	17 58 51.387336	+34 00 19.32012	1240-0274024	..	269.7141139	+34.0053667	B	0.0	0.0	0.0	0.0	9.630	B
6	14.462	17 58 52.179336	+34 00 24.28992	1240-0274034	YM	269.7174139	+34.0067472	Y	-19.8	9.0	-3.8	9.0	17.090	Y					14.917	14.176	12.692
[****ClosingBrace(s)Inserted****]
6	14.462	17 58 52.179336	+34 00 24.28992	1240-0274034	YM	269.7174139	+34.0067472	Y	-19.8	9.0	-3.8	9.0	17.090	Y					14.917	14.176	12.692

%22>\Ahref='VizieR-5?-ref=VIZ66433cd814ea69&-out.add=.&-source=I/297/out&NOMAD1===1240-0274040' class='full'716.31017 58 53.004672+34 00 22.470121240-0274040..269.7208528+34.0062417B 0.0 0.0 0.0 0.018.040o    16.450B         816.63617 58 52.068672+34 00 26.409961240-0274033..269.7169528+34.0073361B 0.0 0.0 0.0 0.0 9.630B    15.050e         917.34417 58 50.782656+34 00 09.050041240-0274021..269.7115944+34.0025139B 0.0 0.0 0.0 0.018.360o                 1018.22817 58 51.446664+34 00 25.639921240-0274025..269.7143611+34.0071222B 326.0 3.0 112.0 20.018.660o    14.920B         1119.28817 58 52.849992+34 00 27.200161240-0274038..269.7202083+34.0075556B 0.0 0.0 0.0 0.0        15.160e         1219.98417 58 50.575344+34 00 08.049961240-0274016..269.7107306+34.0022361B 0.0 0.0 0.0 0.018.650o                 1322.81717 58 50.470008+34 00 18.230041240-0274013..269.7102917+34.0050639B 0.0 0.0 0.0 0.017.620o    15.960B         1423.47617 58 50.335992+34 00 15.080041240-0274011..269.7097333+34.0041889B 8.0 2.0 56.0 13.017.750o    16.090B         1524.84617 58 53.511336+34 00 28.310041240-0274047..269.7229639+34.0078639B 0.0 0.0 0.0 0.018.310o    16.240B         1624.89217 58 50.185344+34 00 12.449881240-0274009..269.7091056+34.0034583B 0.0 0.0 0.0 0.0        16.450B         1724.90417 58 53.580672+34 00 27.579961240-0274049..269.7232528+34.0076611B 20.0 1.0 -30.0 11.017.810o    16.510B         1825.03517 58 53.360664+34 00 30.070081240-0274046..269.7223361+34.0083528B 0.0 0.0 0.0 0.0        15.620e         1925.05417 58 53.058672+34 00 32.349961240-0274043..269.7210778+34.0089861B 0.0 0.0 0.0 0.0        16.800e         2026.43617 58 53.675328+34 00 28.569961240-0274052..269.7236472+34.0079361B 0.0 0.0 0.0 0.0        17.340B         2126.85317 58 50.068656+34 00 15.689881240-0274007..269.7086194+34.0043583B 0.0 0.0 0.0 0.018.580o    16.640B         2228.31517 58 53.661336+34 00 31.290121240-0274050..269.7235889+34.0086917B 0.0 0.0 0.0 0.0        16.700B         2328.37617 58 53.560008+34 00 32.389921240-0274048..269.7231667+34.0089972B 0.0 0.0 0.0 0.017.770B    16.740B         2429.14717 58 53.910000+34 00 29.440081240-0274053..269.7246250+34.0081778B 0.0 0.0 0.0 0.019.730B    17.440B         2529.18617 58 53.206656+34 00 36.050041240-0274044..269.7216944+34.0100139B 0.0 0.0 0.0 0.0        18.860B         2629.39117 58 53.737992+33 59 47.770081239-0279500YM269.7239083+33.9966028B 2.0 3.0 6.0 1.017.820Y16.910Y16.810B15.54715.00715.074   2729.87017 58 49.799328+34 00 05.500081240-0274005.M269.7074972+34.0015278B 0.0 0.0 0.0 0.016.200B    15.870B15.35814.75614.564   %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	f_	RAICRS deg	DEICRS deg	r'mag mag	Nt	Jmag mag	Hmag mag	Ksmag mag
1	29.709	17 58 53.74248	+33 59 47.3964	175853.7+335947		269.723927	+33.996499	16.869	2	15.547	15.008	15.075

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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	12.518	17 58 51.79968	+34 00 21.4380	N3DS000610	269.715832	+34.005955	1993.609	9.12	9.84	10.36	8.89	3	26.49	0.54
2	14.424	17 58 53.18784	+34 00 02.7756	N3DS003200	269.721616	+34.000771	1993.609	20.46				3	1.51	0.41
3	29.722	17 58 53.75496	+33 59 47.5152	N3DS003131	269.723979	+33.996532	1993.609	16.94	18.43	17.37	16.82	0	2.92	0.04

%0a%0a%3cP%3e%0a%0a%5b%2a%2a%2a%2aClosingBrace%28s%29Inserted%2a%2a%2a%2a%5d">

">Note: The limiting magnitude is about 15.2 in the GSC photometric system.