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	4.371	12 39 50.27880	+03 47 48.4008	0900-07204832	189.959495	+03.796778			12.1	11.5	1956.188
2	8.435	12 39 50.74800	+03 47 45.9204	0900-07204862	189.961450	+03.796089			17.5	17.5	1956.188
3	13.240	12 39 50.11872	+03 47 39.8400	0900-07204818	189.958828	+03.794400			17.7	18.2	1956.188
4	14.576	12 39 49.73688	+03 47 41.6328	0900-07204790	189.957237	+03.794898			17.8	17.9	1956.188
5	21.394	12 39 51.80688	+03 47 55.3128	0900-07204928	189.965862	+03.798698			18.6	17.1	1956.188

%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

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	4.64	12 39 50.2560	+03 47 48.264	0029200722	189.95940	+03.79674	0.2	14.76	0.40	6	3	01UQ	1985.051

%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	4.29	12 39 50.2464	+03 47 48.732	0029200722	189.95936	+03.79687	0.2	14.79	0.41	6	3	1985.051

%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	4.792	12 39 50.26008	+03 47 48.0624	EO1560-0154526	189.959417	+03.796684	14.44		1	6.55	30.3	0.19	15.20		1	19.44	26.0	0.76
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%204.792&%3cFONT%20COLOR=%27#CD5B45%27>12%2039%2050.26008&%3cFONT%20COLOR=%27#CD5B45%27>%2b03%2047%2048.0624&EO1560-0154526&189.959417&%2b03.796684&14.44&%20&%201&%20%20%206.55&%20%2030.3&%200.19&15.20&%20&%201&%20%2019.44&%20%2026.0&%20%200.76&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ66405b3e15e48b&-out.add=.&-source=I/267/out&APM-ID===EO1560-0154710&-out.orig=o' class='full'219.79112 39 50.62416+03 47 32.9604EO1560-0154710189.960934+03.79248919.94   1 2.13 3.5 0.2622.17L 0     2.23   321.03412 39 51.78144+03 47 55.4316EO1560-0154430189.965756+03.79873117.32  -1 1.44 11.3 0.0819.84   1 3.11 6.9 2.52   427.95912 39 50.53872+03 48 20.3112EO1560-0154098189.960578+03.80564220.00L 0      21.89  -1 -0.44 3.5 1.89   %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	4.442	12 39 50.25600	+03 47 48.4800	N12032322	189.959400	+03.796800	1996.271	11.67	0.41	12.27	0.41	0	11.33	0.22
2	14.192	12 39 50.05152	+03 47 39.1848	N12032328337	189.958548	+03.794218	1991.040			17.31	0.41	3	7.54	0.42
3	21.248	12 39 51.79440	+03 47 55.5864	N12032326221	189.965810	+03.798774	1996.271	16.82	0.41	18.48	0.41	3	3.86	0.19

%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 [****ClosingBrace(s)Inserted****]
">

Imag

%22>%5cFONT SIZE=-1mag 1 4.88312 39 50.27136+03 47 47.89320937-0220380189.959464+03.7966372592721979.7 0 0512.2511.2711.4010.9211.28 2 7.36012 39 50.74944+03 47 47.41080937-0220384189.961456+03.7965039995821967.8 0 0318.9816.4715.08     3 8.17412 39 50.71536+03 47 45.87000937-0220383189.961314+03.796075 752811969.5 0 0317.6417.62  17.05   4 8.74212 39 50.27808+03 47 43.86120937-0220381189.959492+03.7955179999991985.6 0 0418.72  13.7115.5516.76 510.12812 39 50.32488+03 47 42.36000937-0220382189.959687+03.7951009994051976.2 0 02  17.86  16.84   611.99112 39 49.87152+03 47 43.30320937-0220378189.957798+03.795362154 401983.8 -276 -228318.30    14.8616.59 712.02512 39 50.10480+03 47 41.20080937-0220379189.958770+03.7947783559991975.6 0 0418.0018.5614.68  16.60 813.43712 39 49.77816+03 47 42.61200937-0220377189.957409+03.7951709999991976.2 0 02  18.11  15.56   914.71312 39 49.73280+03 47 41.50320937-0220376189.957220+03.7948623691941976.9 0 0418.0518.19  16.7017.01 1021.01312 39 51.77736+03 47 55.70160937-0220387189.965739+03.7988061301051979.7 0 12519.1817.1617.9516.6916.62 1127.86112 39 50.51016+03 48 20.24280938-0216174189.960459+03.8056232907261981.1 0 0320.96  20.8719.96   %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	4.887	12 39 50.271336	+03 47 47.88996	0937-0224160	YM	189.9594639	+03.7966361	B	0.0	0.0	0.0	0.0	17.460	Y			10.920	B	15.675	14.810	14.648
2	7.359	12 39 50.749344	+03 47 47.41008	0937-0224164	..	189.9614556	+03.7965028	B	0.0	0.0	0.0	0.0	15.080	B			16.470	e
3	8.174	12 39 50.715336	+03 47 45.87000	0937-0224163	..	189.9613139	+03.7960750	B	0.0	0.0	0.0	0.0	17.640	o			17.050	B
4	8.743	12 39 50.278008	+03 47 43.86012	0937-0224161	..	189.9594917	+03.7955167	B	0.0	0.0	0.0	0.0	13.710	B			15.550	B
5	10.128	12 39 50.324664	+03 47 42.36000	0937-0224162	..	189.9596861	+03.7951000	B	0.0	0.0	0.0	0.0					16.840	B
6	11.996	12 39 49.871328	+03 47 43.29996	0937-0224158	..	189.9577972	+03.7953611	B	-276.0	6.0	-228.0	1.0	18.300	o			14.860	B
[****ClosingBrace(s)Inserted****]
6	11.996	12 39 49.871328	+03 47 43.29996	0937-0224158	..	189.9577972	+03.7953611	B	-276.0	6.0	-228.0	1.0	18.300	o			14.860	B

%22>\Ahref='VizieR-5?-ref=VIZ66405b3e15e48b&-out.add=.&-source=I/297/out&NOMAD1===0937-0224159' class='full'712.02612 39 50.104656+03 47 41.200080937-0224159..189.9587694+03.7947778B 0.0 0.0 0.0 0.014.680B    18.560e         813.44012 39 49.777992+03 47 42.609840937-0224157..189.9574083+03.7951694B 0.0 0.0 0.0 0.0        15.560B         914.71712 39 49.732656+03 47 41.499960937-0224156..189.9572194+03.7948611B 0.0 0.0 0.0 0.018.050o    16.700B         1021.01312 39 51.777336+03 47 55.700160937-0224167.M189.9657389+03.7988056B 0.0 4.0 12.0 3.017.950B    16.690B16.04715.23615.157   1127.85712 39 50.509992+03 48 20.239920938-0220032..189.9604583+03.8056222B 0.0 0.0 0.0 0.020.870B    19.960B         %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	4.740	12 39 50.25696	+03 47 48.1416	123950.2+034748		189.959404	+03.796706	15.521	1

%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	4.438	12 39 50.25600	+03 47 48.4836	N4XA000002	189.959400	+03.796801	1996.271	11.67	12.27	12.91	11.96	3	11.33	0.22
2	14.189	12 39 50.05152	+03 47 39.1884	N4XA008337	189.958548	+03.794219	1991.040		17.31			3	7.54	0.42
3	21.252	12 39 51.79464	+03 47 55.5900	N4XA006221	189.965811	+03.798775	1996.271	16.82	18.48	17.98	16.45	3	3.86	0.19
4	27.740	12 39 50.52264	+03 48 20.1096	N4XA006239	189.960511	+03.805586	1996.271	20.50	20.99			0	1.52	0.42
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e4&%3cFONT%20COLOR=%27#CD5B45%27>27.740&%3cFONT%20COLOR=%27#CD5B45%27>12%2039%2050.52264&%3cFONT%20COLOR=%27#CD5B45%27>%2b03%2048%2020.1096&N4XA006239&189.960511&%2b03.805586&1996.271&20.50&20.99&%20&%20&0&%20%201.52&%200.42%3cBR%3e">\EndTABLESORT