4C 73.18

Basic data :
4C 73.18 -- 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,4C,...), QSO (2008ApJS,QSO,...), Bla (2009A&A,[DGT2001],...), X (2012ApJS,1ES,...), AGN (2020MNRAS,CGRaBS), MIR (WISEA,WISE), Sy1 (2012ApJ), BLL (2019ApJS), Bz? ([SRM2005]), G (LEDA), * (Gaia), BH? ([KB2007]), gam (INTREF), 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) : 19 27 48.4947009120 +73 58 01.572558816 (Optical) [ 0.0296 0.0303 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) : 19 28 49.3821777278 +73 51 44.906537263 [ 0.0296 0.0303 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) : 105.6258570472066 +23.5408559014866 [ 0.0296 0.0303 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 : 0.103 -0.111 [0.037 0.038 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) 77350 [150] / z(emission) 0.30209982 [0.0005] / cz 90567.2476 [150]    (Opt) C 2022ApJS..261....2K Syntax of parallax is : 'value quality [error] bibcode' value : parallax value quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality) [error] : mean error bibcode : bibcode of the parallax reference Parallaxes (mas): 0.0207 [0.0408] A 2018yCat.1345....0G 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 (6) : V 16.06 [~] D 2010ApJ...710..764K R 15.11 [~] D 2008ApJS..175...97H G 15.950933 [0.010237] C 2020yCat.1350....0G J 14.287 [0.035] C 2003yCat.2246....0C H 13.496 [0.040] C 2003yCat.2246....0C K 12.488 [0.031] C 2003yCat.2246....0C	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: QSO 1928+738A, B, C See also Specfind radio flux densities.

4C 73.18	1Jy 1928+73	SWIFT J1928.0+7356	[JSE87] 1928+738 1
BWE 1928+7351	KNOWS J192754+735816	SWIFT J1928.2+7357	[KB2007] J192748.5+735802.0
6C 192848+735148	LEDA 2821878	TGSSADR J192747.8+735802	[MGL2009] BZQ J1927+7358
8C 1928+738	2MASS J19274848+7358013	TIC 420175378	[MML2015] 5BZQ J1927+7358
CGRaBS J1927+7358	MY 192848.2+735149.9	VLSSr J192748.3+735800	[P82] 1928+738
CJF B1928+738	MY 192848.2+735806.5	VLSS J1927.8+7357	[PGB2011] J1927+7358
CLASS J192748.4936+735801.566	NB 73.20	VSOP J1927+7358	[PW82] 1928+73
CRATES J192747+735755	NVSS J192748+735802	WB 1928+7351	[SRM2005] J192748.49+735801.5
1ES 1928+73.8	PCCS2 143 G105.62+23.54	WISEA J192748.48+735801.4	[VV2000] J192748.6+735802
GB3 1928+738	PG 1928+738	WISE J192748.49+735801.5	[VV2003] J192748.6+735802
GB6 B1928+7351	PKS 1928+738	WISE J192748.48+735801.4	[VV2006] J192748.6+735802
GB6 J1927+7357	QSO J1927+73	WMAP 70	[VV2010] J192748.6+735802
87GB 192847.4+735146	QSO B1928+738	WMAP J1927+7357	[VV96] J192748.6+735802
ICRF J192748.4+735801	QSO J1927+7358	WMAP J1927+7358	[VV98] J192748.6+735802
IERS B1928+738	QSO B1928+7351	WMAP J1927+7402	[WCO2009] J192742+735634
INTREF 978	QSO B1928+73	WN B1928.8+7351	Gaia DR3 2264975124082451712
IVS B1928+738	RFC J1927+7358	[BAG2012] 292.1210+73.9471	Gaia DR1 2264975124082451712
JVAS J1927+739	RORF 1928+738	[BDW2002] q1928+7351	Gaia DR2 2264975124082451712
JVAS B1928+738	1RXS J192748.0+735757	[DGT2001] B1928+738
JVAS B1927+739	S5 1928+738	[FS2003] 1023
1Jy 1928+738	S5 1928+73	[HB93] 1928+738

References (534 between 1850 and 2024) (Total 534) 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 : 4C 73.18

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