IERS B1842+681

Basic data :
8C 1842+681 -- 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,8C,...), QSO (2005ApJ,QSO,...), Bla (2009A&A,[MGL2009],...), gam (3FGL,4FGL,...), X (2009A&A,RX,...), AGN (2020MNRAS,CGRaBS), MIR (WISEA,WISE), BLL (2019ApJS), Bz? ([SRM2005]), * (Gaia) 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) : 18 42 33.64168679 +68 09 25.2277637 (Radio) [ 0.0329277 0.0335 0 ] A 2020A&A...644A.159C 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) : 18 42 43.42456167 +68 06 19.8181906 [ 0.0329277 0.0335 0 ] 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) : 098.53000523226 +25.85341670282 [ 0.0329277 0.0335 0 ] 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 : -0.006 0.056 [0.124 0.123 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) 110104 [~] / z(spectroscopic) 0.47 [~] / cz 140902 [~]    (Opt) D 2017ApJS..233....3T 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 (3) : V 17.9 [~] E ~ R 18.01 [~] D 2008ApJS..175...97H G 18.599688 [0.023665] C 2020yCat.1350....0G	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.

8C 1842+681	ICRF J184233.6+680925	S4 1842+68	WN B1842.7+6806
BWE 1842+6806	IERS B1842+681	S4 1842+681	[HB93] 1842+681
6C 184242+680627	IVS B1842+681	TGSSADR J184233.4+680924	[MGL2009] BZQ J1842+6809
CGRaBS J1842+6809	JVAS J1842+681	TXS 1842+681	[MML2015] 5BZQ J1842+6809
CJ1 1842+681	JVAS B1842+681	VLSSr J184233.5+680922	[PGB2011] J1842+6809
CJF B1842+681	MASIV J1842+6809	VLSS J1842.5+6809	[SRM2005] J184233.64+680925.2
CLASS J184233.6415+680925.219	NVSS J184233+680925	WB 1842+6806	[VV2000] J184233.7+680924
CRATES J184232+680929	QSO B1842+681	WISEA J184233.64+680925.2	[VV2003] J184233.7+680924
EF B1842+6806	RFC J1842+6809	WISE J184233.64+680925.2	[VV2006] J184233.7+680924
3FGL J1842.8+6810	RGB J1842+681	WMAP J1842+6809	[VV2010] J184233.7+680924
4FGL J1842.3+6810	RGB J1842.6+6809	WMAP 66	[VV96] J184233.7+680924
1FLE J1838+6812	RORF 1842+681	WMAP J1842+6807	[VV98] J184233.7+680924
GB6 J1842+6809	RX J1842.4+6809	WMAP J1842+6808	Gaia DR3 2258763540516880640
GB6 B1842+6806	RX J1842.5+6809	WMAP J1841+6809	Gaia DR1 2258763536221181824
87GB 184241.8+680620	1RXS J184233.0+680930	WN B1842+6806	Gaia DR2 2258763540516880640

References (129 between 1850 and 2023) (Total 129) 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 : IERS B1842+681

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