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	0.005	J124127.7+545819	1239+552	1239+552	N	12 41 27.70389624	0.00032552	+54 58 19.0577051	0.0041013	0.154	54440.7	54440.7	54440.7	1	8

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	0.015	190.365434	+54.971955	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	0.292	N4B8039770	190.36540900000	+54.97203910000	1111311039770	2010.560	4																					17.366	16.773	12.180	8.976

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	0.292	J124127.69+545819.3	190.3654090	+54.9720391	Im	17.366	0.124	16.773	0.265	12.180		8.976								0000	0	nnnn	1689	1483	4259	1566	BBUU		2M

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	0.229	1914p545o0072998	190.3653226	+54.9719510	1.0501e+02	0.0000e+00	5.7249e+00	0.0000e+00	1.00000	0.00000	0.8114	0.0000

II/365/catwise

The CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2021) ReadMe+ftp 2021ApJS..253....8M metaII/365/catwise The CatWISE2020 catalog (original column names in green) (1890715640 rows)

Full	_r arcsec	RA_ICRS deg	e_ arcsec	DE_ICRS deg	e_ arcsec	Name	nW1	mW1	nW2	mW2	RAPMdeg deg	e_ arcsec	DEPMdeg deg	e_ arcsec	pmRA arcsec/yr	e_ (...)	pmDE arcsec/yr	e_ (...)	snrW1pm	snrW2pm	FW1pm ct	e_ ct	FW2pm ct	e_ ct	W1mproPM mag	W2mproPM mag	pmQual	Dist arcsec	snrdELON	snrdELAT	chi2pmRA	chi2pmDE	ka	k1	k2	km	Sep arcsec	abf	WISEA
1	0.506	190.3654053	0.1648	+54.9720986	0.1904	J124127.70+545819.5	12	12	5	12	190.3654416	0.1686	54.9721111	0.1952	0.01155	0.0647	-0.03700	0.0739	18.8	8.9	1.1e+02	6e+00	1.7e+02	2e+01	17.440	16.945	1N000	0.355	0.868	0.668	1.95e-01	1.28e-01	3	3	3	3	0.244	00	WISEA

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	188.9332	+55.6581	UMa

Note:

VII/292/north

DESI Legacy Imaging Surveys DR8 (Duncan, 2022) ReadMe+ftp 2022MNRAS.512.3662D metaVII/292/north Legacy Surveys DR8 North Photometric Redshifts catalog (32 3213 867 sources) (323213867 rows)

Full	_r arcsec	id	RAJ2000 deg	DEJ2000 deg	release	brickid	objid	type	pstar	gmmcomp	zphot	e_	fclean	fqual
1	0.096	8001601974001656	190.365404586156	+54.971937614021	8001	601974	1656	REX	0.001	R6	1.105	0.151	0	0
2	4.493	8001601974001657	190.366077741025	+54.973150801567	8001	601974	1657	REX	0.005	R8	0.867	0.115	1	1

VIII/60/calib

Interferometer phase calibration sources (Patnaik+ 1998) ReadMe+ftp 1992MNRAS.254..655P metaVIII/60/calib Jodrell Bank VLA Astrometric Survey (JVAS) list of phase calibrators (2121 rows)

Full	_r arcsec	Paper	Bname	Jname	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	S8.4GHz mJy
1	0.013	1	B1239+552	J1241+549	12 41 27.70425	+54 58 19.0397	111.0

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	0.82	B1239.1+5515B		12 41 27.61	+54 58 19.2	C		141	143	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	0.56	124127+545819	12 41 27.72	+54 58 19.6	0.05	0.6	280.1	8.4	<	17.7	<	15.5

VIII/72/catalog

CLASS survey of radio sources (Myers+, 2003) ReadMe+ftp 2003MNRAS.341....1M metaVIII/72/catalog CLASS catalog (23418 rows)

Full	_r arcsec	GB6	qin	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	S8.4GHz mJy	maj mas	b/a	PA deg	dir
1	0.013	124125+545842	1.07	12 41 27.7029	+54 58 19.063	94.2	53	0.22	-48	900223A

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	0.2	GB6 B1239+5515	-51194	8400	9.42e+01	1.9e+01	190.3654	+54.9720	CLASS J124127.7028+545819.062	SED	view with aladin	0.33
2	0.2	87GB 123909.4+551514	-51194	8400	9.42e+01	1.9e+01	190.3654	+54.9720	CLASS J124127.7028+545819.062	SED	view with aladin	0.33
3	0.2	JVAS J1241+549	-51194	8400	1.11e+02	2.2e+01	190.3654	+54.9720	JVAS J1241+549	SED	view with aladin	0.33
4	0.2	WN B1239.1+5515B	-51194	8400	9.42e+01	1.9e+01	190.3654	+54.9720	CLASS J124127.7028+545819.062	SED	view with aladin	0.33
5	0.2	CLASS J124127.7028+545819.062	-51194	8400	9.42e+01	1.9e+01	190.3654	+54.9720	CLASS J124127.7028+545819.062	SED	view with aladin	0.33
6	0.2	GB6 B1239+5515	-51194	1400	2.84e+02	5.7e+01	190.3655	+54.9720	FIRST J124127.7+545819	SED	view with aladin	5.00
7	0.2	87GB 123909.4+551514	-51194	1400	2.84e+02	5.7e+01	190.3655	+54.9720	FIRST J124127.7+545819	SED	view with aladin	5.00
8	0.2	JVAS J1241+549	-51194	1400	2.84e+02	5.7e+01	190.3655	+54.9720	FIRST J124127.7+545819	SED	view with aladin	5.00
9	0.2	WN B1239.1+5515B	-51194	1400	2.84e+02	5.7e+01	190.3655	+54.9720	FIRST J124127.7+545819	SED	view with aladin	5.00
10	0.2	CLASS J124127.7028+545819.062	-51194	1400	2.84e+02	5.7e+01	190.3655	+54.9720	FIRST J124127.7+545819	SED	view with aladin	5.00
11	0.5	GB6 B1239+5515	-51194	1400	2.80e+02	5.6e+01	190.3655	+54.9721	NVSS J124127+545819	SED	view with aladin	45.00
12	0.5	87GB 123909.4+551514	-51194	1400	2.80e+02	5.6e+01	190.3655	+54.9721	NVSS J124127+545819	SED	view with aladin	45.00
13	0.5	JVAS J1241+549	-51194	1400	2.80e+02	5.6e+01	190.3655	+54.9721	NVSS J124127+545819	SED	view with aladin	45.00
14	0.5	WN B1239.1+5515B	-51194	1400	2.80e+02	5.6e+01	190.3655	+54.9721	NVSS J124127+545819	SED	view with aladin	45.00
15	0.5	CLASS J124127.7028+545819.062	-51194	1400	2.80e+02	5.6e+01	190.3655	+54.9721	NVSS J124127+545819	SED	view with aladin	45.00
16	0.9	GB6 B1239+5515	-51194	325	1.43e+02	2.9e+01	190.3650	+54.9720	WN B1239.1+5515B	SED	view with aladin	12.00
17	0.9	87GB 123909.4+551514	-51194	325	1.43e+02	2.9e+01	190.3650	+54.9720	WN B1239.1+5515B	SED	view with aladin	12.00
18	0.9	JVAS J1241+549	-51194	325	1.43e+02	2.9e+01	190.3650	+54.9720	WN B1239.1+5515B	SED	view with aladin	12.00
19	0.9	WN B1239.1+5515B	-51194	325	1.43e+02	2.9e+01	190.3650	+54.9720	WN B1239.1+5515B	SED	view with aladin	12.00
20	0.9	CLASS J124127.7028+545819.062	-51194	325	1.43e+02	2.9e+01	190.3650	+54.9720	WN B1239.1+5515B	SED	view with aladin	12.00

Note: The column FIRST provides a link to the FIRST cutout image server (see also the original FIRST search engine)

VIII/92/first14

The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015) ReadMe+ftp 2015ApJ...801...26H metaVIII/92/first14 The FIRST survey catalog, 14Dec17 Version (946432 rows)

Full	_r arcsec	FIRST	FITS	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	p(S)	Fpeak mJy	Fint mJy	Rms mJy	Maj arcsec	Min arcsec	PA deg	N1	c1	N2	Ep yr	Ep(JD) d	s_ d
1	0.128	J124127.7+545819	FITS	12 41 27.718	+54 58 19.09	0.014	276.49	283.99	0.152	1.02	0.74	148.2	1	g	0	1997.304	2450560.4	23.939

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	186624	FIRST14 J124127.7+545819	4	0.64	0.44	1400	2.84e+02	5.7e+01	190.3655	+54.9720	SED	view with aladin	4.9998
2	0.4	186624	ILT J124127.74+545819.3	4	0.64	0.44	144	6.61e+01	1.3e+01	190.3656	+54.9720	SED	view with aladin	25.0020
3	0.5	186624	NVSS J124127+545819	4	0.64	0.44	1400	2.80e+02	5.6e+01	190.3655	+54.9721	SED	view with aladin	45.0000
4	0.9	186624	WN B1239.1+5515B	4	0.64	0.44	325	1.43e+02	2.9e+01	190.3650	+54.9720	SED	view with aladin	12.0000

VIII/104/ghzbreak_cand

SPECFIND V3.0 Catalog of radio continuum spectra (Stein+, 2021) ReadMe+ftp 2021A&A...655A..17S metaVIII/104/ghzbreak_cand Spectral break source candidates at 1.4 GHz (table A2) image spectrum (31179 rows)

Full	_r arcsec	Seq	Name	cat	Resolved	a	b	alow	e_	ahigh	e_	Freq MHz	S mJy	e_ mJy	RAJ2000 deg	DEJ2000 deg	Beam	SED	Radio+Opt
1	0.2	1317	JVAS J1241+549	gps	0	-0.82	5.21	0.80	0.12	-0.65	0.09	8400	1.110e+02	2.20e+01	190.3654	+54.9720	0.0055	SED	view with aladin
2	0.2	1317	CLASS J124127.7028+545819.062	gps	0	-0.61	4.36	0.80	0.12	-0.65	0.09	8400	9.420e+01	1.90e+01	190.3654	+54.9720	0.0055	SED	view with aladin
3	0.2	1317	VIPS J12414+5458	gps	0	-0.62	4.39	0.80	0.12	-0.65	0.09	5000	1.390e+02	2.80e+01	190.3654	+54.9720	0.0000	SED	view with aladin
4	0.2	1317	CRATES J124125+545842	gps	0	-0.82	5.21	0.80	0.12	-0.65	0.09	8400	9.420e+01	1.90e+01	190.3654	+54.9720	0.1000	SED	view with aladin
5	0.2	1317	FIRST14 J124127.7+545819	gps	0	-0.62	4.39	0.80	0.12	-0.65	0.09	1400	2.840e+02	5.70e+01	190.3655	+54.9720	0.0833	SED	view with aladin
6	0.4	1317	ILT J124127.74+545819.3	gps	0	0.95	-0.38	0.80	0.12	-0.65	0.09	144	6.610e+01	1.30e+01	190.3656	+54.9720	0.4167	SED	view with aladin
7	0.5	1317	NVSS J124127+545819	gps	0	-0.61	4.36	0.80	0.12	-0.65	0.09	1400	2.800e+02	5.60e+01	190.3655	+54.9721	0.7500	SED	view with aladin
8	0.9	1317	WN B1239.1+5515B	gps	0	0.95	-0.38	0.80	0.12	-0.65	0.09	325	1.430e+02	2.90e+01	190.3650	+54.9720	0.2000	SED	view with aladin

B/merlin/merlin

The MERLIN Archive (MERLIN 1992-) ReadMe+ftp metaB/merlin/merlin Log of MERLIN archive data (3839 rows)

Full	_r arcsec	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	Name	begDATE "Y:M:D"	Freq MHz	Bandwidth MHz	Type	DataNo
1	0.013	12 41 27.704300	+54 58 19.04000	1239+552	1995-06-02	4994.000	16.000	PHICAL	535059

J/ApJ/658/203/table1

VLBA imaging and polarimetry survey at 5GHz (Helmboldt+, 2007) ReadMe+ftp 2007ApJ...658..203H metaJ/ApJ/658/203/table1 Source properties (1119 rows)

Full	_r arcsec	Seq	VIPS	n_	S8.5 mJy	S5 mJy	Sp5 mJy	Ta	R mas	PAjet deg	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"
1	0.013	584	J12414+5458		94.2	139.4	26.0	CSO	7.1		12 41 27.7030	+54 58 19.063

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	0.565	190.365500	+54.972111	280.10	8.40	3	2449808.473	1.013	NVSS

J/ApJ/737/45/table2

Variable 1.4GHz radio sources from NVSS and FIRST (Ofek+, 2011) ReadMe+ftp 2011ApJ...737...45O metaJ/ApJ/737/45/table2 Observing Times of FIRST Sources (816331 rows)

Full	_r arcsec	RAJ2000 deg	DEJ2000 deg	Sp mJy	e_ mJy	Nobs	t d	dt d	FIRST
1	0.128	190.365492	+54.971969	276.49	0.15	3	2450568.704	47.884	FIRST

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	0.084	J124127.71+545818.9	190.3654377	5.873985e-07	+54.9719360	1.274294e-06	2.080329e-01	3.777498e-04	1.989152e-01	2.105887e-04	S	VLASS1.1.ql.T24t13.J124414+543000.10.2048.v1	2017-11-20T16:13:14.025024	0

J/ApJS/171/61/table5

All-Sky Survey of Flat-Spectrum Radio Sources (Healey+, 2007) ReadMe+ftp 2007ApJS..171...61H metaJ/ApJS/171/61/table5 The CRATES catalog (14467 rows)

Full	_r arcsec	CRATES	S4.8 mJy	alpha	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	r_	S8.4 mJy	Morph	4.8Cat	Sp	_RA deg	_DE deg
1	0.06	J124125+545842	237	-0.151	12 41 27.70	+54 58 19.1	V	94.2	P	1	Sp	190.36542	+54.97197

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	1239+552	0.66	0.69	0.72	522	35.9	36.8	40.6	110	3	132	O	O	1	ICRF J124127.7+545819	190.365432506	+54.971959024

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	0.177	VLASS1QLCIR J124127.70+545818.8	56	190.36545030	+54.97191103	208.032	0.286	198.916	0.160	0.159	S	0.5878	0.3730	176.0923	J124414+543000	0.60273	0.22148	212.9194	0	0	98.25000	1	https://ws.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/caom2ops/sync?ID=ad%3AVLASS%2FVLASS1.1.ql.T24t13.J124414%2B543000.10.2048.v1.I.iter1.image.pbcor.tt0.subim.fits&RUNID%3Dpjrm7ai81glbfmfj&CIRCLE=190.36545030385338+54.97191102705393+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	J1241+5458	2,8	32	3		11.4	0.5	0	0	190.36543	+54.97196

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	0.005	1239+552	12 41 27.7038	+54 58 19.057		22.11			V	87GB 123909.4+551514

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	0.006	190+054_003	AB-D---------									0.017	190.365433	+54.971961

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	0.006	LQAC_190+054_003	AB-D---------	0.00000							190.365433	+54.971961

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	1.29	J124127.5+545819	190.36481	2.1	+54.97196	2.1	49.2	6.5	47.0	5.3	26.8	1.5	24.4	1.2	-75.9	21.9	2.4	S	R39D66

J/A+A/598/A104/lotss

LOFAR Two-metre Sky Survey (Shimwell+, 2017) ReadMe+ftp 2017A&A...598A.104S metaJ/A+A/598/A104/lotss Full source catalogue of LoTSS PDR 120-168MHz sources (44500 rows)

Full	_r arcsec	ILT	RAJ2000 deg	e_ arcsec	e_RAdegtot arcsec	DEJ2000 deg	e_ arcsec	e_DEdegtot arcsec	FPeak mJy/beam	e_ (...)	e_FPeaktot mJy/beam	FTot mJy	e_ mJy	e_FTottot mJy	Resolved	Islrms mJy/beam	SCode	MosaicID
1	0.29	J124127.7+545819.2	190.36556	0.10987	1.70355	+54.97199	0.11271	1.70373	61.51089	0.61308	12.31745	67.79816	1.02880	13.59860	U	0.59960	C	P191+55

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	0.005	LQAC_190+054_003	190.3654329010	+54.9719604740	AB-D---------		0.00000

J/A+A/622/A1/lotssdr1

LOFAR Two-metre Sky Survey DR1 source catalog (Shimwell+, 2019) ReadMe+ftp 2019A&A...622A...1S metaJ/A+A/622/A1/lotssdr1 LoTSS-DR1 source catalogue (325694 rows)

Full	_r arcsec	Source	RAJ2000 deg	e_ arcsec	DEJ2000 deg	e_ arcsec	Speak mJy/beam	e_ (...)	Sint mJy	e_ mJy	Maj arcsec	e_ (...)	Min arcsec	e_ (...)	DCMaj arcsec	e_ (...)	DCMin arcsec	e_ (...)	PA deg	e_ deg	DCPA deg	e_ deg	rms mJy/beam	Type	Mosaic	Npoint
1	0.4	ILTJ124127.74+545819.3	190.3656	0.0	+54.9720	0.0	56.0	0.2	66.1	0.6	6.9	0.0	6.3	0.0	3.4	0.0	1.9	0.0	74.2	1.6	74.2	1.6	0.18	M	P191+55	5826

J/A+A/622/A1/merge

LOFAR Two-metre Sky Survey DR1 source catalog (Shimwell+, 2019) ReadMe+ftp 2019A&A...622A...1S metaJ/A+A/622/A1/merge Value added radio source catalogue of LoTSS-DR1 (318520 rows)

Full	_r arcsec	Source	RAJ2000 deg	DEJ2000 deg	Speak mJy/beam	Sint mJy	Maj arcsec	Min arcsec	PA deg	Type	IdName	q_IdName	gmagapf mag	rmagapf mag	imagapf mag	zmagapf mag	ymagapf mag	W1magpf mag	W2magpf mag	W3magpf mag	W4magpf mag	zbest	f_	fAGN	fMQCc	XrayClass
1	0.4	ILTJ124127.74+545819.3	190.3656	+54.9720	56.0	66.1	6.9	6.3	74.2	M	AllWISE J124127.69+545819.3							20.0424	20.0875	17.4204	15.5792		0		0	0

J/A+A/622/A92/table5

Ultracompact extragalactic radio sources at 86GHz (Nair+, 2019) ReadMe+ftp 2019A&A...622A..92N metaJ/A+A/622/A92/table5 List of sources (162 rows)

Full	_r arcsec	Source	BName	Name	Ep	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	z	Type	Vmag mag	SimbadName
1	0.003	J1241+5458	1239+552		C	12 41 27.703846	+54 58 19.05549		U	22.1	JVAS B1239+552

J/A+A/622/A92/list

Ultracompact extragalactic radio sources at 86GHz (Nair+, 2019) ReadMe+ftp 2019A&A...622A..92N metaJ/A+A/622/A92/list List of fits files image (174 rows)

Full	_r arcsec	Source	Ep	RAJ2000 deg	DEJ2000 deg	Nx	Ny	Obs.date "Y:M:D"	Freq Hz	size1 Kibyte	FileName1	Title1	size2 Kibyte	FileName2	Title2	AssocData
1	0.01	J1241+5458	C	190.36543	+54.97196	512	512	2011-10-09	8.62619e+10	1207	J1241+5458_C_3mm_cleanmap.fits	J1241+5458 C 3mm clean map	208	J1241+5458_C_3mm_visibility.uvf	J1241+5458 C 3mm visibility data

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	0.005	LQAC_190+054_003	190.3654329010	+54.9719604740	AB-D---------														17.366	16.773	12.180	8.976

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	J123505.8+362119	1232+366	1232+366	12 41 27.70383073	+54 58 19.0524009	0.00003799	0.00035580	0.0151

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 J124127.7+545819	1239+552		V	12 41 27.70380149	+54 58 19.0524880	0.00005558	0.0005200	0.2786	57191.4	54440.7	58015.8	3	132	0	12 41 27.70380149	+54 58 19.0524880

J/A+A/659/A1/catalog

LOFAR Two-metre Sky Survey (LoTSS) DR2 (Shimwell+, 2022) ReadMe+ftp 2022A&A...659A...1S metaJ/A+A/659/A1/catalog Raw radio component catalogue of LoTSS-DR2 (4396228 rows)

Full	_r arcsec	Source	RAJ2000 deg	DEJ2000 deg	Speak mJy/beam	SpeakTot mJy	Maj arcsec	Min arcsec	DCMaj arcsec	DCMin arcsec	PA deg	DCPA deg	Islrms mJy/beam	SCode	Mosaic	Npoint	MaskFract
1	0.19	ILTJ124127.71+545819.2	190.36546	+54.97201	54.073	65.383	6.77	6.43	3.14	2.30	63.13	63.13	0.191	S	P191+55	3	1.000

J/AJ/133/2487/table3

VERA 22GHz Fringe Search Survey (Petrov+, 2007) ReadMe+ftp 2007AJ....133.2487P metaJ/AJ/133/2487/table3 List of not detected sources (1945 rows)

Full	_r arcsec	JName	BName	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	l_	MinF Jy	AvrF Jy	MaxF Jy	Num	Com
1	0.06	J1241+5458	1239+552	12 41 27.70	+54 58 19.0	<	0.12	0.20	0.29	3	NEW

J/AJ/142/35/table10

The VLBA Galactic Plane Survey (VGaPS) (Petrov+, 2011) ReadMe+ftp 2011AJ....142...35P metaJ/AJ/142/35/table10 The list of 160 sources that have not been detected in VGaPS observations (160 rows)

Full	_r arcsec	Bname	Jname	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	GLAT deg	Flux mJy	alpha	o_	SED
1	0.007	1239+552	J1241+5458	12 41 27.703	+54 58 19.05	62.4	200	-0.08	6	SED

J/AJ/142/89/table2

Precise astrometry with VLBA (VIPS) (Petrov+, 2011) ReadMe+ftp 2011AJ....142...89P metaJ/AJ/142/89/table2 VIPS (Very Long Baseline Array imaging and Polarimetry Survey) catalog of 857 sources (857 rows)

Full	_r arcsec	n_	IVS	RAJ2000 "h:m:s"	e_ mas	DEJ2000 "d:m:s"	e_ mas	Stot Jy	Sunr Jy	l_	Ctot Jy	l_	Cunr Jy	l_	Xtot Jy	Xunr Jy	Simbad
1	0.002	X	1239+552	12 41 27.703705	0.79	+54 58 19.05118	0.45	0.268	0.102		0.134		0.036		0.982	0.115	Simbad

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	0.005	non-VCS	Compar	J124127.7+545819	1239+552	12 41 27.70389624	0.00032552	+54 58 19.0577051	0.0041013	0.154	54440.7	54440.7	54440.7	1	8	Simbad

J/AJ/151/154/catalog

Second epoch VLBA Calibrator Survey (VCS-II) (Gordon+, 2016) ReadMe+ftp 2016AJ....151..154G metaJ/AJ/151/154/catalog VCS-II catalog: re-observed sources (table 2), and originally undetected VCS sources (table 3) (2386 rows)

Full	_r arcsec	Sce	VCS-II	IVS	VCS	ICRF2	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	SStot Jy	SSun Jy	SXtot Jy	SXun Jy	alpha	Date "Y:M:D"	Nobs	SimbadName
1	0.000	re	J1241+5458	1239+552	0	1	12 41 27.7038350	+54 58 19.052456	0.289	0.096	0.089	0.016	-0.88	2014-06-09	75	IVS B1239+552

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	0.002	1239+552	190.36543333333329997	+54.97195888888889215	0.1	q	2017-09-18	0.000292	0.013295	0.100961	0.056526	0.103116	7.6	0.000206	0.001875	0.066947	0.061811	0.066693	35.7	190.36543333333329997	+54.97195888888889925

J/MNRAS/329/700/list1

Optical IDs of JVAS using APM (Snellen+ 2002) ReadMe+ftp 2002MNRAS.329..700S metaJ/MNRAS/329/700/list1 APM IDs of sources in JVAS++ and JVAS (762 rows)

Full	_r arcsec	APM	Name	RA2000 "h:m:s"	DE2000 "d:m:s"	Emag mag	O-E mag	S5GHz mJy	S1.4GHzN mJy	z
1	0.014	APM	JVS1241+5458	12 41 27.7030	+54 58 19.04	20.00		237	280

J/MNRAS/376/371/table2

Polarisation of flat-spectrum radio sources (Jackson+, 2007) ReadMe+ftp 2007MNRAS.376..371J metaJ/MNRAS/376/371/table2 Polarization angle measurements with the automated analysis (12746 rows)

Full	_r arcsec	RAJ2000 "h:m:s"	DEJ2000 "d:m:s"	IFlux mJy	e_ mJy	QFlux mJy	e_ mJy	UFlux mJy	e_ mJy	PA deg	CLASSdata
1	0.013	12 41 27.7029	+54 58 19.063	93.4	0.4	-0.02	0.21	-0.28	0.21	132.5	CLASSdata

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	0.005	Compar	J124127.7+545819	1239+552	12 41 27.70389231	0.00032552	+54 58 19.0577230	0.0041013	0.154	54440.7	54440.7	54440.7	1	8

J/MNRAS/468/196/tablea1

The invisible AGN catalogue (Truebenbach+, 2017) ReadMe+ftp 2017MNRAS.468..196T metaJ/MNRAS/468/196/tablea1 Invisible AGN Catalogue (46258 rows)

Full	_r arcsec	FIRST	RAJ2000 deg	DEJ2000 deg	F1.4GHz mJy	AllWISE	Note	RAAdeg deg	DEAdeg deg	l_	[3.4] mag	SNR3.4	l_	[4.6] mag	SNR4.6	l_	[12] mag	SNR12	l_	[22] mag	SNR22	theta arcsec	Simbad
1	0.128	J124127.7+545819	190.365492	+54.971969	283.99	J124127.69+545819.3		190.3654090	54.9720391		17.366	8.7		16.773	4.1	<	12.180	1.6	<	8.976	0.7	0.30	FIRST J124127.7+545819

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	0.445	190.365504148	+54.972075511	0.29	0.001	0.27		0.000487	0.12	0.008	0.06	0.006	0.005343	0.370219	0.028391	564.04	M	2	0	0	153538	979835

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	0.005	LQAC_190+054_003	190.36543290100	54.97196047400	0.00488280000	0.00410130000							AB-D------—