W Comae

Basic data :
7C 1219+2830 -- BL Lac Origin of the objects types : (Ref) Object type as listed in the reference "Ref" (acronym) Object type linked to the acronym according to the original reference () Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases Other object types: Rad (2020A&A,7C,...), gam (1AGL,2EG,...), BLL (2010ApJ,[VV2000b],...), Bla (2012ApJ,[DGT2001],...), X (2009A&A,2E,...), QSO (2016A&A,QSO,...), V* (2018AJ,AN,...), AGN (2011ApJ,CGRaBS), Opt (ATO,LAMOST,...), MIR (WISEA,WISE), GiC (CAIRNS), G (2021AJ), * (Gaia), NIR (2MASS) Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" : ra dec : right ascension and declination (unit and frame defined according to your Output Options) Grey values are increasing the original precision due to the computation of frame transformations (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam) [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue), position angle (in degrees North celestial pole to East) quality : flag of quality E ≥ 10" D : 1-10" (and some old data) C : 0.1-1" B : 0.01-0.1" + 2MASS, Tyc A : VLBI, Hipparcos bibcode : bibcode of the coordinates reference ICRS coord. (ep=J2000) : 12 21 31.6904439888 +28 13 58.500308172 (Optical) [ 0.0342 0.0309 90 ] A 2020yCat.1350....0G Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" : ra dec : right ascension and declination (unit and frame defined according to your Output Options) Grey values are increasing the original precision due to the computation of frame transformations (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam) [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue), position angle (in degrees North celestial pole to East) quality : flag of quality E ≥ 10" D : 1-10" (and some old data) C : 0.1-1" B : 0.01-0.1" + 2MASS, Tyc A : VLBI, Hipparcos bibcode : bibcode of the coordinates reference FK4 coord. (ep=B1950 eq=1950) : 12 19 01.1212085451 +28 30 36.649334150 [ 0.0342 0.0309 90 ] Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" : ra dec : right ascension and declination (unit and frame defined according to your Output Options) Grey values are increasing the original precision due to the computation of frame transformations (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam) [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue), position angle (in degrees North celestial pole to East) quality : flag of quality E ≥ 10" D : 1-10" (and some old data) C : 0.1-1" B : 0.01-0.1" + 2MASS, Tyc A : VLBI, Hipparcos bibcode : bibcode of the coordinates reference Gal coord. (ep=J2000) : 201.7352530890140 +83.2880250079280 [ 0.0342 0.0309 90 ] Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode" pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr) pm-dec : mu-dec (expressed in the ICRS system in mas/yr) [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg) quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality) bibcode : bibcode of the proper motion reference Proper motions mas/yr : 0.079 -0.024 [0.039 0.039 90] A 2020yCat.1350....0G Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode" value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity) [error] : error of the corresponding value displayed before (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown) quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality) bibcode : bibcode of the value's origin Radial velocity / Redshift / cz : V(km/s) 29266 [48] / z(spectroscopic) 0.10289 [0.00016] / cz 30845.6 [48.0]    C 2009ApJS..182..543A Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode" filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z (System) : may be AB (default is Vega) flux-value : value of flux or magnitude [error] : error value quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality) MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4]) bibcode : bibcode of the flux reference Fluxes (12) : B 16.81 [~] D 2010A&A...518A..10V V 16.11 [~] D 2010A&A...518A..10V R 14.24 [~] D 2008ApJS..175...97H G 15.677232 [0.014738] C 2020yCat.1350....0G J 12.478 [0.026] C 2003yCat.2246....0C H 11.742 [0.035] C 2003yCat.2246....0C K 10.972 [0.021] C 2003yCat.2246....0C u (AB) 15.877 [0.005] B 2009ApJS..182..543A g (AB) 15.379 [0.003] B 2009ApJS..182..543A r (AB) 15.045 [0.004] B 2009ApJS..182..543A i (AB) 14.771 [0.004] B 2009ApJS..182..543A z (AB) 14.568 [0.005] B 2009ApJS..182..543A	SIMBAD within arcmin ', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay points in this preview 2MASS DSS SDSSXMMIRACIRISGALEX All (CDSPortal) Send to within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR. The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding. Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
Some important notes on this object about identifications and objects associations. notes: See also Specfind radio flux densities.

7C 1219+2830	1FHL J1221.6+2814	RGB J1221+282	[CRJ2004] J1221.5+2813
1AGL J1222+2851	3FHL J1221.5+2813	RGB J1221.5+2813	[DGT2001] B1219+285
AN 10.1916	FIRST J122131.6+281358	RORF 1219+285	[GGR94] 1219+285
ATO J185.3820+28.2329	GB6 B1219+2830	RX J1221.5+2814	[HB93] 1219+285
B2 1219+28	87GB 121900.8+283039	RX J1221.5+2813	[IN88] 1219+285
B2.2 1219+28	GeV J1222+2837	1RXS J122131.1+281402	[MGL2009] BZB J1221+2813
BWE 1219+2830	ICRF J122131.6+281358	S3 1219+28	[MML2015] 5BZB J1221+2813
CAIRNS J122131.69+281358.5	IERS B1219+285	SDSS J122131.69+281358.4	[P82] 1219+285
CGRaBS J1221+2813	INTREF 489	TeV J1221+282	[VV2000b] J122131.7+281358
CLASS J122131.6935+281358.496	IVS B1219+285	TIC 285095960	[VV2003b] J122131.7+281358
2E 2673	JVAS J1221+2813	TXS 1219+285	[VV2006b] J122131.7+281358
2E 1219.0+2830	JVAS B1219+285	V* W Com	[VV2010b] J122131.7+281358
2EG J1222+2821	LAMOST J122131.68+281358.5	VIPS J12215+2813	[VV98b] J122131.7+281358
3EG J1222+2841	LINEAR 3472523	VIPS 550	[VYP98] 1219+285
EGR J1222+2845	MASIV J1221+2813	VRO 28.12.02	[W72] 1219+28
2EGS J1222+2821	2MASS J12213168+2813585	WB 1219+2830	[ZEH2003] RX J1221.5+2814 2
1ES 1218+28.5	MITG J122132+2814	WISEA J122131.68+281358.4	AAVSO 1216+28
0FGL J1221.7+2814	NRAO 1219+28	WISE J122131.69+281358.5	Gaia DR3 4010020203303760640
1FGL J1221.5+2814	NVSS J122131+281358	WISE J122131.68+281358.4	Gaia DR1 4010020199008338176
2FGL J1221.4+2814	OHIO N 231	2XMM J122131.6+281358	Gaia DR2 4010020203303760640
3FGL J1221.4+2814	QSO B1219+28	9Y-MST J1221+2813
4FGL J1221.5+2814	QSO B1219+285	[ATZ98] D115

References (837 between 1850 and 2023) (Total 837) Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system). Follow new references on this object

Collections of Measurements

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : W Comae

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