The 1 column in color are computed by VizieR, and are not part of the original data.

I/323/icrf2

International Celestial Reference Frame 2, ICRF2 (Ma+, 2009) ReadMe+ftp 2009ITN....35....1M metaI/323/icrf2 ICRF2 catalog (tn35.pdf) (3414 rows)

Full	_r arcsec	ICRF	IVS	IERS	fl	RAJ2000 "h:m:s"	e_ s	DEJ2000 "d:m:s"	e_ arcsec	Corr	Ep d	Of d	Ol d	Nexp	Nobs
1	0.000	J025154.6+561619	0248+560	0248+560	V	02 51 54.62814977	0.00002587	+56 16 19.5232268	0.0002924	-0.238	52440.6	52409.7	53306.8	2	58

Note:

I/324/igsl3

The Initial Gaia Source List (IGSL) (Smart, 2013) ReadMe+ftp 2013yCat.1324....0S metaI/324/igsl3 IGSL3 data release (1,222,598,530 sources) (1222598530 rows)

Full	_r arcsec	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	0.001	042.977617	+56.272090	0.099	0.099									2000.0000	2000.0000	0.0	0.0	0.0	0.0

I/353/gsc242

The Guide Star Catalog, Version 2.4.2 (GSC2.4.2) (STScI, 2020) ReadMe+ftp 2008AJ....136..735L metaI/353/gsc242 Guide Star Catalogue, Version 2.4.2 (original column names in green) (3485671481 rows)

Full	_r arcsec	GSC2	RA_ICRS deg	DE_ICRS deg	objID	Epoch yr	Class	Gmag mag	OMag mag	Bjmag mag	Fpgmag mag	Epgmag mag	Npgmag mag	Umag mag	Bmag mag	Vmag mag	umag mag	gmag mag	rmag mag	imag mag	zmag mag	ymag mag	Jmag mag	Hmag mag	Ksmag mag	Zmag mag	Ymag mag	W1mag mag	W2mag mag	W3mag mag	W4mag mag	FUVmag mag	NUVmag mag	a pix	e pix	PA pix
1	0.112	NAV6049299	042.97758356000	+56.27211459000	1313000249299	2012.616	0													21.255	20.770	20.1530						15.869	14.455	11.235	8.283

Note:

II/311/wise

WISE All-Sky Data Release (Cutri+ 2012) ReadMe+ftp 2012yCat.2311....0C metaII/311/wise The WISE All-Sky data Release; please acknowledge the usage of the WISE data products (563921584 rows)

Full	_r arcsec	WISE	RAJ2000 deg	DEJ2000 deg	eeMaj arcsec	eeMin arcsec	Im	W1mag mag	e_ mag	W2mag mag	e_ mag	W3mag mag	e_ mag	W4mag mag	e_ mag	Jmag mag	Hmag mag	Kmag mag	ccf	ex	var	d2M arcsec	2M
1	0.163	J025154.64+561619.6	042.977688	+56.272112	0.319	0.289	Im	15.932	0.080	14.485	0.066	11.045	0.109	8.484	0.265				0000	0	000n		2M

Note:

II/328/allwise

AllWISE Data Release (Cutri+ 2013) ReadMe+ftp 2014yCat.2328....0C metaII/328/allwise The AllWISE data Release (updated version, 16-Feb-2021); please acknowledge the usage of the WISE data products (747634026 rows) (Note)

Full	_r arcsec	AllWISE	RAJ2000 deg	DEJ2000 deg	Im	W1mag mag	e_ mag	W2mag mag	e_ mag	W3mag mag	e_ mag	W4mag mag	e_ mag	Jmag mag	e_ mag	Hmag mag	e_ mag	Kmag mag	e_ mag	ccf	ex	var	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)	qph	d2M arcsec	2M
1	0.148	J025154.64+561619.5	042.9776895	+56.2720992	Im	15.869	0.058	14.455	0.054	11.235	0.178	8.283	0.222							D000	0	n1nn	50	413	-186	432	AABB		2M

Note:

II/349/ps1

The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016) ReadMe+ftp 2016arXiv161205560C metaII/349/ps1 Pan-STARRS DR1 catalogue (original column names in green) (1919106885 rows)

Full	_r arcsec	RAJ2000 deg	DEJ2000 deg	objID	f_objID	Qual	e_RAJ2000 (...)	e_DEJ2000 arcsec	Epoch d	Ns	Nd	gmag mag	e_ mag	gKmag mag	e_ mag	gFlags	rmag mag	e_ mag	rKmag mag	e_ mag	rFlags	imag mag	e_ mag	iKmag mag	e_ mag	iFlags	zmag mag	e_ mag	zKmag mag	e_ mag	zFlags	ymag mag	e_ mag	yKmag mag	e_ mag	yFlags
1	0.112	042.977583560	+56.272114590	175520429775717268	436527104	52	0.0863	0.0898	56080.615752310	4	7					16416					114720	21.2553	0.1378			115256	20.7695	0.0743	20.5587	0.2245	115000	20.1530	0.1542	19.4692	0.1918	16892216

Note:

II/363/unwise

The band-merged unWISE Catalog (Schlafly+, 2019) ReadMe+ftp 2019ApJS..240...30S metaII/363/unwise The band-merged unWISE catalog (original column names in green) (2214734224 rows)

Full	_r arcsec	objID	RAJ2000 deg	DEJ2000 deg	FW1 309.05nJy	FW2 167.66nJy	e_FW1 309.05nJy	e_FW2 167.66nJy	q_W1	q_W2	fFW1	fFW2
1	0.198	0426p560o0031439	042.9777137	+56.2721027	5.8091e+02	1.7712e+03	8.4491e+00	3.0069e+01	1.00000	1.00000	0.8892	0.9853

V/165/igapsdr1

IGAPS. merged IPHAS and UVEX of northern Galactic plane (Monguio+, 2020) ReadMe+ftp 2020A&A...638A..18M metaV/165/igapsdr1 IGAPS point source catalogue (original column names in green) (295365268 rows)

Full	_r arcsec	Name	RAJ2000 deg	DEJ2000 deg	SourceID	imag mag	e_ mag	Hamag mag	e_ mag	rImag mag	e_ mag	rUmag mag	e_ mag	gmag mag	e_ mag	Umag mag	e_ mag	errBits
1	0.572	J025154.60+561619.0	042.97748294639	+56.27194953348	1023266-1-2937	20.65	0.19											0

VI/42/out

Identification of a Constellation From Position (Roman 1987) ReadMe+ftp 1987PASP...99..695R metaVI/42/out Compute constellation name from Position (357 rows)

Full	_r arcsec	RA1875 deg	DE1875 deg	Cst
1	0.1	040.6882	+55.7535	Per

VIII/13/catalog

A new catalog of 53522 4.85GHz sources (Becker+ 1991) ReadMe+ftp 1991ApJS...75....1B metaVIII/13/catalog The catalogue of radio sources (53522 rows)

Full	_r arcsec	Name	RAB1950 "h:m:s"	DEB1950 "d:m:s"	Flux mJy	extFlag	SpIndex	n_
1	4.0	0248+5604	02 48 13.2	+56 04 04	248		0.2

VIII/42/txs

Texas Survey of radio sources at 365MHz (Douglas+ 1996) ReadMe+ftp 1996AJ....111.1945D metaVIII/42/txs The Texas Survey (66841 rows)

Full	_r arcsec	TXS	RA1950 "h:m:s"	e_ s	DE1950 "d:m:s"	e_ arcsec	S365 Jy	e_ Jy	SNflg	Spec	Vstar	Sep arcsec	Struct	_RA.icrs "h:m:s"	_DE.icrs "d:m:s"
1	1.455	0248+560	02 48 13.659	0.340	+56 04 01.81	1.30	0.189	0.022		2.2			P	02 51 54.775	+56 16 20.32

VIII/62/wenss

The Westerbork Northern Sky Survey (Leiden, 1998) ReadMe+ftp metaVIII/62/wenss WENSS catalogue, concatenation of the main part (28 to 76°) and the polar part (above 72°) (229420 rows)

Full	_r arcsec	Name	f_	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	flg1	flg2	Speak mJy	Sint mJy	MajAxis arcsec	MinAxis arcsec	PA deg
1	2.16	B0248.2+5604		02 51 54.41	+56 16 20.7	S		171	172	0	0	0

VIII/65/nvss

1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) ReadMe+ftp 1998AJ....115.1693C metaVIII/65/nvss The NVSS Catalog (1773484 rows)

Full	_r arcsec	NVSS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	e_RAJ2000 s	e_DEJ2000 arcsec	S1.4 mJy	e_ mJy	l_	MajAxis arcsec	l_	MinAxis arcsec	f_resFlux
1	0.61	025154+561619	02 51 54.56	+56 16 19.3	0.05	0.6	195.1	5.9	<	16.5	<	15.6	P*

The column SED is a link to a plot of the radio spectrum, and the column Radio+Opt is a link to an Aladin preview. The SED plot contains points from the cross-identification (spectra; red), from the waste basket (waste; yellow), and the fitted radio spectra as lines. The Aladin preview contains a DSS image together with NVSS contours (blue) and the points and associated beams of the radio spectrum (red); points and beams of the sources from the waste basket are hidden but can be made visible by clicking on the corresponding plane (yellow).

VIII/85A/spectra

SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009) ReadMe+ftp 2010A&A...511A..53V metaVIII/85A/spectra The parameters of the radio spectra image spectrum (631736 rows)

Full	_r arcsec	Seq	n_	Name	N	a	b [mJy]	nu MHz	S(nu) mJy	e_ mJy	RAJ2000 deg	DEJ2000 deg	zSim	SED	Radio+Opt	beam arcsec
1	0.7	9127	5	NVSS J025154+561619	8	0.11	2.01	1400	1.95e+02	3.9e+01	042.9773	+56.2720	zSim	SED	view with aladin	45.00
2	1.4	9127	5	TXS 0248+560	8	0.11	2.01	365	1.89e+02	3.8e+01	042.9782	+56.2723	zSim	SED	view with aladin	6.00
3	2.1	9127	5	WN B0248.2+5604	8	0.11	2.01	325	1.72e+02	3.4e+01	042.9767	+56.2724	zSim	SED	view with aladin	12.00
4	4.5	9127	5	BWE 0248+5604	8	0.02	2.22	4850	2.48e+02	5.0e+01	042.9763	+56.2731	zSim	SED	view with aladin	138.00

The column SED is a link to a plot of the radio spectrum, and the column Radio+Opt is a link to an Aladin preview. The SED plot contains points from the cross-identification (spectra; red), from the waste basket (waste; yellow), and the fitted radio spectra as lines. The Aladin preview contains a DSS image together with NVSS contours (blue) and the points and associated beams of the radio spectrum (red); points and beams of the sources from the waste basket are hidden but can be made visible by clicking on the corresponding plane (yellow).

VIII/85A/waste

SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009) ReadMe+ftp 2010A&A...511A..53V metaVIII/85A/waste Source parameters based on positional cross-id spectrum (1497216 rows)

Full	_r arcsec	Assoc	Seq	nu MHz	S(nu) mJy	e_ mJy	RAJ2000 deg	DEJ2000 deg	Name	SED	Radio+Opt	beam arcsec
1	0.7	GB6 B0248+5604	9127	1400	1.95e+02	3.9e+01	042.9773	+56.2720	NVSS J025154+561619	SED	view with aladin	45.00
2	0.7	RRF 1406	9127	1400	1.95e+02	3.9e+01	042.9773	+56.2720	NVSS J025154+561619	SED	view with aladin	45.00
3	1.4	GB6 B0248+5604	9127	365	1.89e+02	3.8e+01	042.9782	+56.2723	TXS 0248+560	SED	view with aladin	6.00
4	1.4	RRF 1406	9127	365	1.89e+02	3.8e+01	042.9782	+56.2723	TXS 0248+560	SED	view with aladin	6.00
5	2.1	GB6 B0248+5604	9127	325	1.72e+02	3.4e+01	042.9767	+56.2724	WN B0248.2+5604	SED	view with aladin	12.00
6	2.1	RRF 1406	9127	325	1.72e+02	3.4e+01	042.9767	+56.2724	WN B0248.2+5604	SED	view with aladin	12.00
7	4.5	RRF 1406	9127	4850	2.48e+02	5.0e+01	042.9763	+56.2731	BWE 0248+5604	SED	view with aladin	138.00

The column SED is a link to a plot of the radio spectrum, and the column Radio+Opt is a link to an Aladin preview. The SED plot contains points from the cross-identification (spectra; red), from the waste basket (waste; yellow), and the fitted radio spectra as lines. The Aladin preview contains a DSS image together with NVSS contours (blue) and the points and associated beams of the radio spectrum (red); points and beams of the sources from the waste basket are hidden but can be made visible by clicking on the corresponding plane (yellow).

VIII/104/spectra

SPECFIND V3.0 Catalog of radio continuum spectra (Stein+, 2021) ReadMe+ftp 2021A&A...655A..17S metaVIII/104/spectra The parameters of the radio spectra image (1658207 rows)

Full	_r arcsec	Seq	Name	N	a	b [mJy]	nu MHz	S(nu) mJy	e_ mJy	RAJ2000 deg	DEJ2000 deg	SED	Radio+Opt	beam arcsec
1	0.2	39662	K-RFC J0251+5616	9	0.22	1.69	22000	4.80e+02	9.6e+01	042.9775	+56.2721	SED	view with aladin	126.0000
2	0.7	39662	NVSS J025154+561619	9	0.22	1.69	1400	1.95e+02	3.9e+01	042.9773	+56.2720	SED	view with aladin	45.0000
3	0.9	39662	TGSSADR J025154.5+561620	9	0.22	1.69	150	1.24e+02	2.5e+01	042.9774	+56.2723	SED	view with aladin	25.0020
4	1.4	39662	TXS 0248+560	9	0.22	1.69	365	1.89e+02	3.8e+01	042.9782	+56.2723	SED	view with aladin	6.0000
5	2.1	39662	WN B0248.2+5604	9	0.22	1.69	325	1.72e+02	3.4e+01	042.9767	+56.2724	SED	view with aladin	12.0000
6	4.5	39662	BWE 0248+5604	9	0.14	1.90	4850	2.48e+02	5.0e+01	042.9763	+56.2731	SED	view with aladin	138.0000

The column SED is a link to a plot of the radio spectrum, and the column Radio+Opt is a link to an Aladin preview. The SED plot contains points from the cross-identification (spectra; red), from the waste basket (waste; yellow), and the fitted radio spectra as lines. The Aladin preview contains a DSS image together with NVSS contours (blue) and the points and associated beams of the radio spectrum (red); points and beams of the sources from the waste basket are hidden but can be made visible by clicking on the corresponding plane (yellow).

VIII/104/waste

SPECFIND V3.0 Catalog of radio continuum spectra (Stein+, 2021) ReadMe+ftp 2021A&A...655A..17S metaVIII/104/waste Source parameters based on positional cross-id spectrum (3570814 rows)

Full	_r arcsec	Assoc	Seq	nu MHz	S(nu) mJy	e_ mJy	RAJ2000 deg	DEJ2000 deg	Name	SED	Radio+Opt	beam arcsec
1	0.2	F3R 4081	39662	22000	4.80e+02	9.6e+01	042.9775	+56.2721	K-RFC J0251+5616	SED	view with aladin	126.0000
2	0.7	F3R 4081	39662	1400	1.95e+02	3.9e+01	042.9773	+56.2720	NVSS J025154+561619	SED	view with aladin	45.0000
3	0.9	F3R 4081	39662	150	1.24e+02	2.5e+01	042.9774	+56.2723	TGSSADR J025154.5+561620	SED	view with aladin	25.0020
4	1.4	F3R 4081	39662	365	1.89e+02	3.8e+01	042.9782	+56.2723	TXS 0248+560	SED	view with aladin	6.0000
5	2.1	F3R 4081	39662	325	1.72e+02	3.4e+01	042.9767	+56.2724	WN B0248.2+5604	SED	view with aladin	12.0000
6	4.5	F3R 4081	39662	4850	2.48e+02	5.0e+01	042.9763	+56.2731	BWE 0248+5604	SED	view with aladin	138.0000

VIII/111/vcscat

VCCS Epoch 1 Bright Catalog Release (Peters+, 2021) ReadMe+ftp 2021AAS...23721106P metaVIII/111/vcscat VCSS Epoch 1 bright catalog release (52844 rows)

Full	_r arcsec	Name	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 deg	e_DEJ2000 deg	Ftot mJy	e_ mJy	Ftotc mJy	Fpeak mJy	e_ mJy	Fpeakc mJy	Maj arcsec	e_ (...)	Min arcsec	e_ (...)	PA deg	e_ deg	FtotIsl mJy	e_ mJy	Islrms mJy/beam	Islmean mJy/beam	ResIslrms mJy/beam	ResIslmean mJy/beam	SCode	Compact	SNR
1	2.7	VCSS1 J025154.3+561620	042.9764	+56.2724	3.20000e-05	2.70000e-05	155.21	4.00	181.40	182.97	2.49	198.70	19.3	0.3	12.9	0.1	53.0	1.6	147.54	3.88	2.69	0.09	1.47	-0.04	S	1.20	67.98

J/ApJ/737/45/table1

Variable 1.4GHz radio sources from NVSS and FIRST (Ofek+, 2011) ReadMe+ftp 2011ApJ...737...45O metaJ/ApJ/737/45/table1 Observing times of NVSS sources (1773484 rows)

Full	_r arcsec	RAJ2000 deg	DEJ2000 deg	Sp mJy	e_ mJy	Nobs	t d	dt d	NVSS
1	0.610	042.977333	+56.272028	195.10	5.90	5	2449369.998	24.929	NVSS

J/ApJ/914/42/table5

Radio follow-up to 4FGL-DR2 unassociated sources (Bruzewski+, 2021) ReadMe+ftp 2021ApJ...914...42B metaJ/ApJ/914/42/table5 *VLASS (Karl G. Jansky Very Large Array Sky Survey) catalog; see the Appendix (original column names in green) (2232726 rows) (Note)

Full	_r arcsec	Name	RAJ2000 deg	e_ deg	DEJ2000 deg	e_ deg	Flux Jy	e_ Jy	Fpk Jy/beam	e_ (...)	Type	Pointing	Obs "Y-M-D,h:m:s"	Flag
1	0.329	J025154.56+561619.7	042.9775232	7.611858e-07	+56.2721650	2.054274e-06	3.101650e-01	1.766926e-03	2.976244e-01	7.380238e-04	M	VLASS1.2.ql.T24t03.J025338+563000.10.2048.v1	2019-05-31T12:19:34.274993	0

J/ApJS/213/3/table1

Low-frequency flat spectrum sources (LORCAT) (Massaro+, 2014) ReadMe+ftp 2014ApJS..213....3M metaJ/ApJS/213/3/table1 Low-frequency radio catalog of flat-spectrum sources (LORCAT) catalog (28358 rows)

Full	_r arcsec	WSRT	NVSS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	Sep arcsec	alpha	e_	Cat	Simbad
1	0.61	0248.2+5604	J025154+561619	02 51 54.56	+56 16 19.3	1.87	-0.09	0.03	wenss	Simbad

J/ApJS/228/22/table2

Korean VLBI Network Calibrator Survey (KVNCS). I. (Lee+, 2017) ReadMe+ftp 2017ApJS..228...22L metaJ/ApJS/228/22/table2 The Korean VLBI Network Calibrator Survey (KVNCS) catalog (1848 rows)

Full	_r arcsec	Name	IVS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	Code22	Flux22	e_	Code43	Flux43	e_	z	r_	VCS	SimbadName	NED
1	0.155	J0251+5616	0248+560	02 51 54.61	+56 16 19.56	KVNCS1.2.2	0.48	0.04	KVNCS1.2.2	0.43	0.07			1	IVS B0248+560	NED

J/ApJS/242/4/table3

Two new catalogs of blazar candidates (D'Abrusco+, 2019) ReadMe+ftp 2019ApJS..242....4D metaJ/ApJS/242/4/table3 *WIBRaLS2 catalog (9541 rows) (Note)

Full	_r arcsec	WISE	RAJ2000 deg	DEJ2000 deg	W1-W2 mag	W2-W3 mag	W3-W4 mag	SBZB	SMIX	SBZQ	Class	Type	Radio	S mJy	q22	Rcat	Simbad
1	0.148	J025154.64+561619.5	042.9776895	+56.2720992	1.20	2.96	2.95	0.00	0.00	0.28	D	BZQ	NVSSJ025154+561619	195.1000000	-1.73	1	WISEA J025154.64+561619.5

J/ApJS/242/5/table2

40yr of geodetic/astrometric VLBI obs. of ICRF sources (Xu+, 2019) ReadMe+ftp 2019ApJS..242....5X metaJ/ApJS/242/5/table2 Closure amplitude rms (CARMS) and closure phase rms (CPRMS) values for 3417 ICRF3 sources (3417 rows)

Full	_r arcsec	IERS	CARMS-N	CARMS-B	CARMS-U	Namp	CPRMS-N deg	CPRMS-B deg	CPRMS-U deg	Npha	Nses	Nobs	F-ICRF2	F-ICRF3	ICRF2	SimbadName	_RA deg	_DE deg
1	0.000	0248+560	0.20	0.21	0.22	420	6.1	6.3	6.9	112	2	191	O	O	1	ICRF J025154.6+561619	042.977617193	+56.272089815

J/ApJS/255/30/comp

VLASS QL Ep.1 Catalog, CIRADA version (Gordon+, 2021) ReadMe+ftp 2021ApJS..255...30G metaJ/ApJS/255/30/comp Detected components and properties (3381277 rows)

Full	_r arcsec	CompName	CompId	RAJ2000 deg	DEJ2000 deg	Ftot mJy	e_ mJy	Fpeak mJy/beam	e_ (...)	Islrms mJy/beam	SCode	DCMaj arcsec	DCMin arcsec	DCPA deg	Subtile	NVSSdist arcsec	FIRSTdist arcsec	PeakToRing	DupFlag	QualFlag	NNdist arcsec	MainSample	QLcutout
1	0.574	VLASS1QLCIR J025154.56+561619.6	46	042.97734316	+56.27213789	316.521	0.644	298.581	0.247	0.247	M	1.1733	0.0000	100.3746	J025338+563000	0.55456	106948.01569	65.9616	0	0	6.03000	1	https://ws.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/caom2ops/sync?ID=ad%3AVLASS%2FVLASS1.2.ql.T24t03.J025338%2B563000.10.2048.v1.I.iter1.image.pbcor.tt0.subim.fits&RUNID%3Dou1ytwsfljwgrmce&CIRCLE=42.977343156625516+56.272137891865924+0.025

J/ApJS/260/4/table2

AGN jet directions from 1.4-86GHz VLBI obs. (Plavin+, 2022) ReadMe+ftp 2022ApJS..260....4P metaJ/ApJS/260/4/table2 Frequency-averaged directions of parsec-scale jets with a single value for each AGN (9220 rows)

Full	_r arcsec	Name	Freq GHz	PA deg	e_ deg	Corr	Median mas	MAD mas	Gaia	DR16Q	_RA deg	_DE deg
1	0.00	J0251+5616	8,24	-166	7		1.1	0.2	0	0	042.97762	+56.27209

J/A+A/506/1477/ocars

Radio source distribution (Titov+, 2009) ReadMe+ftp 2009A&A...506.1477T metaJ/A+A/506/1477/ocars Optical characteristics of astrometric radio sources (4261 rows)

Full	_r arcsec	IERS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	z	vmag mag	n_	f_	Type	Notes
1	0.000	0248+560	02 51 54.6281	+56 16 19.523					R

J/A+A/537/A99/lqac2

Large Quasar Astrometric Catalogue 2 (LQAC-2) (Souchay+, 2012) ReadMe+ftp 2012A&A...537A..99S metaJ/A+A/537/A99/lqac2 Quasars LQAC-2 (187504 rows)

Full	_r arcsec	LQAC	Ref	z	Umag mag	Bmag mag	Vmag mag	Gmag mag	Rmag mag	Imag mag	Dist Mpc	E(B-V) mag	RAJ2000 deg	DEJ2000 deg
1	0.000	042+056_001	ABC----------									1.343	042.977617	+56.272090

J/A+A/583/A75/lqac3

Large Quasar Astrometric Catalogue 3 (LQAC-3) (Souchay+, 2015) ReadMe+ftp 2015A&A...583A..75S metaJ/A+A/583/A75/lqac3 Quasars LQAC-3 (321957 rows)

Full	_r arcsec	LQAC	Ref	z	Umag mag	Bmag mag	Vmag mag	Gmag mag	Rmag mag	Imag mag	RAJ2000 deg	DEJ2000 deg
1	0.000	LQAC_042+056_001	ABC----------	0.00000							042.977617	+56.272090

J/A+A/598/A78/table3

The GMRT 150MHz all-sky radio survey (Intema+, 2017) ReadMe+ftp 2017A&A...598A..78I metaJ/A+A/598/A78/table3 Full source catalog of TGSS ADR1 150 MHz sources (623604 rows)

Full	_r arcsec	TGSSADR	RAJ2000 deg	e_ arcsec	DEJ2000 deg	e_ arcsec	Stotal mJy	e_ mJy	Speak mJy/beam	e_ (...)	Maj arcsec	e_ (...)	Min arcsec	e_ (...)	PA deg	e_ deg	Noise mJy/beam	Code	Mosaic
1	0.78	J025154.5+561620	042.97743	2.0	+56.27228	2.0	123.6	13.2	117.8	12.1	26.0	0.6	25.2	0.6	12.7	30.3	2.7	S	R09D66

J/A+A/614/A140/lqac4

Large Quasar Astrometric Catalogue 4, LQAC-4 (Gattano+, 2018) ReadMe+ftp 2018A&A...614A.140G metaJ/A+A/614/A140/lqac4 4th release of the Large Quasar Astrometric Catalogue (443725 rows)

Full	_r arcsec	LQAC	RAJ2000 deg	DEJ2000 deg	Ref	GAIA	z	umag mag	Bmag mag	Gmag mag	Vmag mag	gmag mag	imag mag	zmag mag	Jmag mag	Kmag mag
1	0.000	LQAC_042+056_001	042.9776172910	+56.2720897850	ABC----------		0.00000

J/A+A/624/A145/lqac5

Astrometric Catalogue 5, LQAC-5 (Souchay+, 2019) ReadMe+ftp 2019A&A...624A.145S metaJ/A+A/624/A145/lqac5 5th release of LQAC5 (592809 rows)

Full	_r arcsec	LQAC	RAJ2000 deg	DEJ2000 deg	Ref	GAIA	z	Gmag2 mag	BPmag mag	RPmag mag	umag mag	Bmag mag	Vmag mag	gmag mag	imag mag	zmag mag	Jmag mag	Kmag mag	W1mag mag	W2mag mag	W3mag mag	W4mag mag
1	0.000	LQAC_042+056_001	042.9776172910	+56.2720897850	ABC----------														15.869	14.455	11.235	8.283

J/A+A/630/A101/combkx

Multi-frequency celestial reference frame (Karbon+, 2019) ReadMe+ftp 2019A&A...630A.101K metaJ/A+A/630/A101/combkx Coordinates for 4567 sources in S/X, and K band. Corresponding Qxx matrix in kx-qxx.dat (4567 rows)

Full	_r arcsec	ICRF	IERS	IVS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	e_RAJ2000 s	e_DEJ2000 arcsec	RA-DE
1	0.000	J024524.9-110716	0242-113	0242-113	02 51 54.62812148	+56 16 19.5234022	0.00000431	0.00004450	-0.0631
2	0.000		1825-214	1825-214	02 51 54.62812148	+56 16 19.5234022	0.00000431	0.00004450	-0.1097

J/A+A/630/A101/combkxka

Multi-frequency celestial reference frame (Karbon+, 2019) ReadMe+ftp 2019A&A...630A.101K metaJ/A+A/630/A101/combkxka Coordinates for 4617 sources in S/X, K band, X/Ka band. Corresponding Qxx matrix in kxka-qxx.dat (4617 rows)

Full	_r arcsec	ICRF	IERS	IVS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	e_RAJ2000 s	e_DEJ2000 arcsec	RA-DE
1	0.000	J144302.7+520137	1441+522	1441+522	02 51 54.62812142	+56 16 19.5234013	0.00000430	0.00004450	-0.0484
2	0.000		1830-589	1830-589	02 51 54.62812142	+56 16 19.5234013	0.00000430	0.00004450	-0.0164

J/A+A/644/A159/table10

The third realization of the ICRF, ICRF3 (Charlot+, 2020) ReadMe+ftp 2020A&A...644A.159C metaJ/A+A/644/A159/table10 Coordinates at S/X band for 4536 sources (4536 rows)

Full	_r arcsec	NSepup3	ICRF	IERS	Cat	fVLBA	RAICRS "h:m:s"	DEICRS "d:m:s"	e_RAICRS s	e_DEICRS arcsec	Corr	Ep d	Of d	Ol d	Nses	Ndel	Nrat	_RA.icrs "h:m:s"	_DE.icrs "d:m:s"
1	0.000		ICRF J025154.6+561619	0248+560		V	02 51 54.62812638	+56 16 19.5233340	0.00001111	0.0001273	-0.0971	56301.0	52409.7	57915.1	2	191	0	02 51 54.62812638	+56 16 19.5233340

J/A+A/644/A159/table11

The third realization of the ICRF, ICRF3 (Charlot+, 2020) ReadMe+ftp 2020A&A...644A.159C metaJ/A+A/644/A159/table11 Coordinates at K band for 824 sources (824 rows)

Full	_r arcsec	ICRF	IERS	Cat	fVLBA	RAICRS "h:m:s"	DEICRS "d:m:s"	e_RAICRS s	e_DEICRS arcsec	Corr	Ep d	Of d	Ol d	Nses	Ndel	Nrat	_RA.icrs "h:m:s"	_DE.icrs "d:m:s"
1	0.000	ICRF J025154.6+561619	0248+560		V	02 51 54.62810877	+56 16 19.5236336	0.00000974	0.0001013	0.0500	57862.2	53891.6	58181.5	6	278	278	02 51 54.62810877	+56 16 19.5236336

J/A+A/658/A2/lbcsall

LOFAR Long-Baseline Calibrator Survey. II. (Jackson+, 2022) ReadMe+ftp 2022A&A...658A...2J metaJ/A+A/658/A2/lbcsall Positions and coherence measurements (30007 rows)

Full	_r arcsec	LBCS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	Obs s	CorrF	Qual	CorrS	Qual2
1	2.16	L397687	02 51 54.41	+56 16 20.7	2015-07-30T05:09:46	XXXXXXXXX-—	O	100010000-—	3

J/A+A/658/A2/lbcscons

LOFAR Long-Baseline Calibrator Survey. II. (Jackson+, 2022) ReadMe+ftp 2022A&A...658A...2J metaJ/A+A/658/A2/lbcscons Positions and coherence measurements, with multiple observations of the same source consolidated and with the best coherence measurement reported (24713 rows)

Full	_r arcsec	LBCS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	Obs s	CorrF	Qual	CorrS	Qual2
1	2.16	L397687	02 51 54.41	+56 16 20.7	2015-07-30T05:09:46	XXXXXXXXX-—	O	100010000-—	3

J/AJ/126/2562/table3

Second VLBA calibrator survey: VCS2 (Fomalont+, 2003) ReadMe+ftp 2003AJ....126.2562F metaJ/AJ/126/2562/table3 The VCS2 Source List (276 rows)

Full	_r arcsec	VCS2	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	Num	SFlux Jy	q_	XFlux	q_
1	0.000	J0251+5616	02 51 54.62812	+56 16 19.5231	56	0.40	2	0.34	2

J/AJ/133/2487/table2

VERA 22GHz Fringe Search Survey (Petrov+, 2007) ReadMe+ftp 2007AJ....133.2487P metaJ/AJ/133/2487/table2 List of detected continuum spectrum sources (533 rows)

Full	_r arcsec	JName	BName	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	Det	F1 Jy	F2 Jy	F3 Jy	Prob	Com
1	0.07	J0251+5616	0248+560	02 51 54.62	+56 16 19.5	D		0.15		0e+00	KNO

J/AJ/142/35/table9

The VLBA Galactic Plane Survey (VGaPS) (Petrov+, 2011) ReadMe+ftp 2011AJ....142...35P metaJ/AJ/142/35/table9 VGaPS catalogue (327 rows)

Full	_r arcsec	Cat	Bname	Jname	RAJ2000 "h:m:s"	e_ mas	DEJ2000 "d:m:s"	e_ mas	Corr	Nobs	Ftot Jy	l_	Func Jy	SED	SimbadName
1	0.001	C	0248+560	J0251+5616	02 51 54.628168	0.55	+56 16 19.52295	0.37	-0.193	152	0.18		0.14	SED	IVS B0248+560

J/AJ/150/58/icrf2

VLBI ICRF2 (Fey+, 2015) ReadMe+ftp 2015AJ....150...58F metaJ/AJ/150/58/icrf2 Coordinates of the International Celestial Reference Frame (ICRF2) sources (tables 5–7) (3414 rows)

Full	_r arcsec	Source	Compar	ICRF2	IERS	RAJ2000 "h:m:s"	e_ s	DEJ2000 "d:m:s"	e_ arcsec	Corr	MJD d	MJD0 d	MJD1 d	Nexp	Nobs	Simbad
1	0.000	VCS-only	Compar	J025154.6+561619	0248+560	02 51 54.62814977	0.00002587	+56 16 19.5232268	0.0002924	-0.238	52440.6	52409.7	53306.8	2	58	Simbad

J/AJ/153/113/table2

The CGPS 1420 MHz catalog of compact sources (Taylor+, 2017) ReadMe+ftp 2017AJ....153..113T metaJ/AJ/153/113/table2 Canadian Galactic Plane Survey (CGPS) 1420MHz source catalog (72787 rows)

Full	_r arcsec	CGPS	Var	ND	RAJ2000 deg	DEJ2000 deg	SI mJy	SP mJy/beam	sigma mJy	P mJy/beam	PA1 deg	MajAxis arcsec	MinAxis arcsec	PA2 deg
1	0.62	J025154+561619			042.97746	+56.27194	269.9	230.7	0.48	3.0	63	24.5	20.7	2

J/AJ/162/121/table4

3627 International Celestial Reference Frame sources (Hunt+, 2021) ReadMe+ftp 2021AJ....162..121H metaJ/AJ/162/121/table4 Radio properties of ICRF sources (5610 rows)

Full	_r arcsec	IERS	RAICRS deg	DEICRS deg	alpha	Session	Obs "Y:M:D"	Srms-t mJy/beam	Srms mJy/beam	Speak Jy/beam	Stot Jy	Sgau Jy	Ssnr	Xrms-t mJy/beam	Xrms mJy/beam	Xpeak Jy/beam	Xtot Jy	Xgau Jy	Xsnr	_RA.icrs deg	_DE.icrs deg
1	0.001	0248+560	042.97761666666666258	+56.27208972222223338	-0.1	k	2017-06-10	0.000262	0.001914	0.376684	0.378106	0.385296	196.8	0.000185	0.000434	0.300706	0.346259	0.345591	692.7	042.97761666666665548	+56.27208972222223338

J/MNRAS/429/3330/catdr1

AMI Galactic Plane Survey at 16GHz. I. (Perrott+, 2013) ReadMe+ftp 2013MNRAS.429.3330P metaJ/MNRAS/429/3330/catdr1 AMIGPS source list of 3503 sources (3503 rows)

Full	_r arcsec	AMIGPS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	Spk mJy	Sint mJy	ecrit arcsec	bmaj arcsec	bmin arcsec	PA deg	chi2	Type
1	3.40	J025154+561617	02 51 54.32	+56 16 17.3	440.1	436.6	100.0	31.7	0.0	26.0	2.12	P

J/MNRAS/445/845/icrf2a

Implications of the Galactic aberration for CRF (Malkin, 2014) ReadMe+ftp 2014MNRAS.445..845M metaJ/MNRAS/445/845/icrf2a ICRF2 catalogue at epoch J2000.0 (3414 rows)

Full	_r arcsec	Compar	ICRF2	IERS	RAJ2000 "h:m:s"	e_ s	DEJ2000 "d:m:s"	e_ arcsec	Corr	MJD d	MJD0 d	MJD1 d	Nexp	Nobs
1	0.000	Compar	J025154.6+561619	0248+560	02 51 54.62815066	0.00002587	+56 16 19.5232236	0.0002924	-0.238	52440.6	52409.7	53306.8	2	58

J/MNRAS/474/5008/spidxcat

Radio spectral index 147-1400MHz (de Gasperin+, 2018) ReadMe+ftp 2018MNRAS.474.5008D metaJ/MNRAS/474/5008/spidxcat *Spectral index catalogue (1396515 rows) (Note)

Full	_r arcsec	RAJ2000 deg	DEJ2000 deg	FtotNVSS Jy	e_ Jy	FpeakNVSS Jy/beam	e_ (...)	rmsNVSS Jy/beam	FtotTGSS Jy	e_ Jy	FpeakTGSS Jy/beam	e_ (...)	rmsTGSS Jy/beam	SpIndex	e_	s2n	Scode	Nmatch	NunmaNVSS	NunmaTGSS	IslId	SourceId
1	0.653	042.977351301	+56.271984420	0.20	0.001	0.19	0.001	0.000527	0.13	0.011	0.12	0.006	0.006230	0.203553	0.037269	364.64	S	1	0	0	1477251	1005350

J/PASJ/52/631/table1

Galactic plane VERA survey (Honma+, 2000) ReadMe+ftp 2000PASJ...52..631H metaJ/PASJ/52/631/table1 List of 284 VLBI source candidates. (284 rows)

Full	_r arcsec	TXS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	GLON deg	GLAT deg	S/N	S22GHz mJy	Note
1	1.51	TXS 0248+560	02 51 54.80	+56 16 20.0	139.13	-2.76	35.2	495

J/other/RAA/19.29/kqcg

Compilation of known QSOs for the Gaia mission (Liao+, 2019) ReadMe+ftp 2019RAA....19...29L metaJ/other/RAA/19.29/kqcg Known QSOs catalog for Gaia mission catalog (1842076 rows)

Full	_r arcsec	Name	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 (...)	e_DEJ2000 arcsec	z	umag mag	gmag mag	rmag mag	imag mag	zmag mag	Ref	W1-W2 mag	W2-W3 mag	W1mag mag
1	0.000	LQAC_042+056_001	42.97761729100	56.27208978500	0.00038805000	0.00029240000							ABC-------—