QSO B1218+304

Basic data :
QSO B1218+304 -- 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: X (2009A&A,2A,...), BLL (2010ApJ,SHBL,...), Rad (B2,BWE,...), gam (1FGL,2FGL,...), Bla (2013ApJS,[DGT2001],...), Bz? (2019A&A,3HSP,...), G (2014ApJ,LEDA,...), QSO (QSO,[HB93]), blu (CSO,[RS65]), MIR (WISEA,WISE), Opt (LAMOST,SDSS), AGN (2011ApJ), Q? (FBQS), GiC (CAIRNS), * (Gaia), UV (PG), 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 21.9426947832 +30 10 37.158534012 (Optical) [ 0.0491 0.0471 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 18 51.6102405911 +30 27 15.351465007 [ 0.0491 0.0471 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) : 186.3585663694743 +82.7345486235420 [ 0.0491 0.0471 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 : -0.021 0.142 [0.065 0.063 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) 50060 [30] / z(spectroscopic) 0.18360 [0.00010] / cz 55041.9 [30.0]    (Opt) C 2012ApJS..203...21A Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode" maj-axis : major axis size (arc minutes) min-axis : minor axis size (arc minutes) angle : orientation angle (in degrees) (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam) quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality) bibcode : bibcode of the angular size reference Angular size (arcmin): 0.170 0.119 90 (NIR) C 2006AJ....131.1163S 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 16.50 [~] D 2010A&A...518A..10V V 15.85 [~] D 2010A&A...518A..10V R 15.7 [~] E 2009A&A...495..691M G 16.684721 [0.011153] C 2020yCat.1350....0G J 14.547 [0.112] D 2006AJ....131.1163S H 13.609 [0.121] D 2006AJ....131.1163S K 13.246 [0.137] D 2006AJ....131.1163S u (AB) 16.389 [0.007] B 2009ApJS..182..543A g (AB) 16.097 [0.003] B 2009ApJS..182..543A r (AB) 15.804 [0.004] B 2009ApJS..182..543A i (AB) 15.621 [0.004] B 2009ApJS..182..543A z (AB) 15.462 [0.006] 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.

QSO B1218+304	3FHL J1221.3+3010	RBS 1100	9Y-MST J1221+3010
2A 1218+304	FIRST J122121.9+301037	1REX J122121+3010.6	[ATZ98] D113
2A 1219+305	GB6 J1221+3010	RGB J1221+301	[DGT2001] B1218+304
3A 1218+303	GB6 B1218+3027	RX J1221.4+3010	[HB93] 1218+304
B2 1218+30	87GB 121852.6+302715	RX J1221.3+3010	[IN88] 1218+304
B2.1 1218+30	1H 1219+301	1RXS J122121.7+301041	[MGL2009] BZB J1221+3010
BWE 1218+3027	H 1219+305	SDSS J122121.94+301037.2	[MML2015] 5BZB J1221+3010
CAIRNS J122121.94+301037.1	H 1218+304	SHBL J122121.9+301037	[RS65] 4
CLASS J122121.9466+301037.152	3HSP J122122.0+301037	SWIFT J1221.3+3012	[VV2000b] J122121.9+301037
CSO 133	IERS B1218+304	TeV J1221+301	[VV2003b] J122121.9+301037
1ES 1218+30.4	INTREF 488	TIC 357187187	[VV2006b] J122121.9+301037
EXO 1218.8+3027	IVS B1218+304	VER J1221+301	[VV2010b] J122121.9+301037
FBQS J1221+3010	LAMOST J122121.94+301037.2	2WHSP J122121.9+301036	[VV98b] J122121.9+301037
1FGL J1221.3+3008	LEDA 1893319	WISEA J122121.94+301037.1	[ZEH2003] RX J1221.3+3010 1
2FGL J1221.3+3010	2MASS J12212194+3010370	WISE J122121.95+301037.2	Gaia DR3 4013476071428318720
3FGL J1221.3+3010	2MASX J12212192+3010368	WISE J122121.94+301037.1	Gaia DR2 4013476071428318720
4FGL J1221.3+3010	NVSS J122121+301036	WN B1218.8+3027
1FHL J1221.3+3011	PBC J1221.3+3008	2XMM J122121.9+301036
2FHL J1221.3+3009	PG 1218+304	XMMSL1 J122121.9+301040

References (442 between 1850 and 2023) (Total 442) 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 : QSO B1218+304

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