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	5.163	20 13 43.60944	+02 50 57.9732	0900-18031222	303.431706	+02.849437			15.3	15.0	1951.577
2	6.021	20 13 43.99608	+02 51 07.4232	0900-18031489	303.433317	+02.852062			17.7	17.3	1951.577

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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	4.161	20 13 43.64448	+02 50 58.8444	N021310117431	303.431852	+02.849679	1990.634	15.17	0.41	16.06	0.42	3	4.44	0.26
2	6.672	20 13 44.05056	+02 51 07.7364	N021310117433	303.433544	+02.852149	1990.634	17.91	0.42	18.85	0.43	3	2.90	0.25

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>	\BegDIVclass='sort-down ' </A>
dec 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	2.662	20 13 43.65672	+02 51 02.5308	0928-0716528	303.431903	+02.850703	973	523	1992.5	0	0	3			16.79	14.26	16.95
2	3.253	20 13 43.61400	+02 51 01.6128	0928-0716524	303.431725	+02.850448	9	999	1992.5	0	0	2			16.46		14.70
3	3.596	20 13 43.65552	+02 51 04.4100	0928-0716527	303.431898	+02.851225	310	632	1981.0	0	0	4		16.96	15.83	14.13	17.46
4	3.801	20 13 43.63488	+02 50 59.5104	0928-0716525	303.431812	+02.849864	146	289	1975.1	6	32	5	16.17	15.07	16.40	15.41	14.91
5	5.994	20 13 44.00616	+02 51 07.3224	0928-0716538	303.433359	+02.852034	136	27	1975.1	0	0	5	18.74	17.41	19.51	18.37	17.63
6	8.023	20 13 43.55016	+02 51 08.7804	0928-0716522	303.431459	+02.852439	239	214	1971.1	0	0	2	18.83			16.25
7	8.705	20 13 43.77216	+02 51 10.6020	0928-0716533	303.432384	+02.852945	999	999	1991.8	120	780	3			15.63	14.98	17.14
8	9.561	20 13 43.51680	+02 51 10.2708	0928-0716521	303.431320	+02.852853	38	364	1975.3	-4	-14	5	17.58	16.04	17.03	16.69	16.36

Note: More recent versions available: UCAC3 (I/315) and UCAC4 (I/322); see also the UCAC home page at http://ad.usno.navy.mil/ucac/

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	2UCAC	RAJ2000 deg	e_ mas	DEJ2000 deg	e_ mas	UCmag mag	No	Nc	pmRA mas/yr	pmDE mas/yr	2Mkey	Jmag mag	Kmag mag
1	4.798	20 13 43.611816	+02 50 58.42824	32786250	303.4317159	15	+02.8495634	22	15.51	2	2	-7.4	4.6	1084507380	14.160	13.572

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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 [****ClosingBrace(s)Inserted****]
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Jmag

%22>%5cFONT SIZE=-1magHmag
magKmag
magR

1 2.66320 13 43.656672+02 51 02.530080928-0761100..303.4319028+02.8507028B 0.0 0.0 0.0 0.016.790B    14.260B         2 3.25320 13 43.614000+02 51 01.609920928-0761097..303.4317250+02.8504472B 0.0 0.0 0.0 0.016.460B                 3 3.59820 13 43.655328+02 51 04.410000928-0761099..303.4318972+02.8512250B 0.0 0.0 0.0 0.015.830B    14.130B         4 4.79820 13 43.611792+02 50 58.427880928-0761096YM303.4317158+02.8495633C -7.3 5.8 4.6 5.815.840Y15.650Y15.410B14.16013.72513.572   5 5.99120 13 44.005992+02 51 07.319880928-0761110YM303.4333583+02.8520333B 0.0 0.0 0.0 0.018.080Y17.850Y18.370B16.25315.79415.529   6 8.02420 13 43.549992+02 51 08.780040928-0761094..303.4314583+02.8524389B 0.0 0.0 0.0 0.018.830o    16.250B         7 8.70320 13 43.771992+02 51 10.599840928-0761105..303.4323833+02.8529444B 120.0303.0 780.0222.315.630B    14.980B         8 9.56120 13 43.516656+02 51 10.270080928-0761093YM303.4313194+02.8528528B -4.0 1.0 -14.0 11.017.390Y16.910Y16.690B15.49015.04514.698   %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	4.728	20 13 43.61544	+02 50 58.4736	201343.6+025058		303.431731	+02.849576	15.546	5	14.160	13.725	13.572

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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	4.158	20 13 43.64448	+02 50 58.8480	N1XT017431	303.431852	+02.849680	1990.634	15.17	16.06	15.49	14.75	3	4.44	0.26
2	6.675	20 13 44.05056	+02 51 07.7400	N1XT017433	303.433544	+02.852150	1990.634	17.91	18.85	18.03	17.18	3	2.90	0.25

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