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	1.975	03 28 52.07688	-21 53 19.0104	0675-01196448	052.216987	-21.888614			17.6	18.0	1983.830
2	26.658	03 28 54.07800	-21 53 25.3320	0675-01196595	052.225325	-21.890370			17.3	17.6	1983.830

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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	1.681	03 28 52.08168	-21 53 19.9032	S031231211785	052.217007	-21.888862	1977.951			18.26	0.35	3	2.51	0.30
2	26.310	03 28 54.05328	-21 53 25.2744	S031231211760	052.225222	-21.890354	1996.784	17.62	0.42	17.59	0.34	3	4.95	0.27

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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	1.188	03 28 52.14072	-21 53 19.1112	0681-0057947	052.217253	-21.888642	301	486	1973.9	0	0	4	19.91	18.90		19.25	18.55
2	2.096	03 28 52.10352	-21 53 18.3516	0681-0057946	052.217098	-21.888431	999	524	1985.7	0	0	2			18.12		18.91
3	2.168	03 28 52.06488	-21 53 18.9132	0681-0057945	052.216937	-21.888587	51	327	1971.8	-10	12	4	19.36	19.08	19.27	19.15
4	20.860	03 28 53.19480	-21 53 04.3008	0681-0057952	052.221645	-21.884528	999	999	1977.8	306	254	3	20.10		20.93	18.10
5	26.355	03 28 54.05544	-21 53 25.3500	0681-0057955	052.225231	-21.890375	173	69	1976.6	-16	4	5	18.92	18.88	18.76	18.27	17.38
6	27.032	03 28 54.12888	-21 53 23.3628	0681-0057956	052.225537	-21.889823	999	999	1992.8	0	0	2				17.51	17.79

Note: The Naval Observatory Merged Astrometric Dataset (NOMAD) contains astrometric and photometric data for over 1 billion stars derived from the Hipparcos (I/239), Tycho-2 (I/259), UCAC2 (I/289), and USNO-B1.0 (I/284) catalogs for astrometry and optical photometry, supplemented by 2MASS (II/246) near-infrared photometry.
An efficient remote query program findnomad1 is available in the cdsclient package, for Unix/Linux platforms

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	1.189	03 28 52.140672	-21 53 19.11012	0681-0058050	..	052.2172528	-21.8886417	B	0.0	0.0	0.0	0.0	19.910	o			19.250	B
2	2.099	03 28 52.103328	-21 53 18.35016	0681-0058049	..	052.2170972	-21.8884306	B	0.0	0.0	0.0	0.0	18.120	B
3	2.173	03 28 52.064664	-21 53 18.90996	0681-0058048	..	052.2169361	-21.8885861	B	-10.0	1.0	12.0	9.0	19.270	B			19.150	B
4	20.859	03 28 53.194656	-21 53 04.30008	0681-0058055	..	052.2216444	-21.8845278	B	306.0	119.0	254.0	78.1	20.930	B			18.100	B
5	26.353	03 28 54.055344	-21 53 25.35000	0681-0058058	..	052.2252306	-21.8903750	B	-16.0	5.0	4.0	2.0	18.760	B			18.270	B
6	27.029	03 28 54.128664	-21 53 23.35992	0681-0058059	..	052.2255361	-21.8898222	B	0.0	0.0	0.0	0.0					17.510	B

%0ats_init%28%27!ext/nomad1.exe_4%27%29;">\Endscript

Note: This version of the GSC-II has no proper motions, but the limits on brightness which existed on GSC2.2 (F<18.5, B_j<19.5) were removed.

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	2.085	03 28 52.06584	-21 53 19.0752	S2PI011785	052.216941	-21.888632	1996.784	18.56	18.34			3	3.88	0.19
2	17.031	03 28 52.94904	-21 53 06.4392	S2PI011844	052.220621	-21.885122	1996.784	19.45	22.21			0	2.19	0.18
3	26.312	03 28 54.05352	-21 53 25.2672	S2PI011760	052.225223	-21.890352	1996.784	17.62	17.66		17.33	3	4.95	0.27

%0a%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RAJ2000 deg	DEJ2000 deg	pmRA mas/yr	pmDE mas/yr	Jmag mag	Kmag mag	b1mag mag	b2mag mag	r1mag mag	r2mag mag	imag mag	[****ClosingBrace(s)Inserted****]
">

mag&%">\BegDIVclass='sort-down ' </A>decNo

fl

1 1.26503 28 52.17936-21 53 18.7080052.217414-21.888530 146.4 -31.7      18.12    18.91 2 0 2 1.59403 28 52.13760-21 53 18.6180052.217240-21.888505 6.3 10.5    19.91  18.9019.2518.55 4 0 3 1.99403 28 52.08000-21 53 18.8952052.217000-21.888582 -2.0 10.0    19.3619.2719.0819.15   4 0 420.82503 28 53.11632-21 53 03.4440052.221318-21.884290 299.2 263.9    20.1020.93  18.10   3 1 526.49603 28 54.06600-21 53 25.3392052.225275-21.890372 -7.6 4.0    18.9218.7618.8818.2717.38 5 0 %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 (...)	e_DEJ2000 arcsec	magBJ mag	e_ mag	magRF mag	e_ mag	magG mag	e_ mag	magGrvs mag	e_ mag	alphaEpoch yr	deltaEpoch yr	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)
1	1.594	03 28 52.13762	-21 53 18.6179	052.217240	-21.888505	0.115	0.115	19.910	0.400	19.250	0.400	19.402	0.400	18.820	0.500	1973.9200	1973.9200	6.3	5.7	10.5	5.7
2	1.995	03 28 52.08000	-21 53 18.8947	052.217000	-21.888582	0.115	0.115	18.338	0.300	18.560	0.300	18.479	0.400	18.569	0.500	1971.8600	1971.8600	-2.0	6.2	10.0	6.2
3	20.825	03 28 53.11632	-21 53 03.4439	052.221318	-21.884290	0.163	0.163	22.209	0.300	19.453	0.300	19.347	0.400	17.512	0.500	1977.8400	1977.8400	299.2	7.5	263.9	7.5
4	26.496	03 28 54.06601	-21 53 25.3389	052.225275	-21.890372	0.103	0.103	17.661	0.300	17.619	0.300	17.615	0.400	17.501	0.500	1976.6800	1976.6800	-7.6	5.3	4.0	5.3

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