8C 1842+681

Query : 8C 1842+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]), Q? (2021MNRAS), AG? (2022ApJS), * (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 Simbad points in this preview
Back
All CDSPortal (CDSPortal)
Send to sendBySAMP sendBySAMP
sedIcon
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!). sed-help-icon
Some important notes on this object about identifications and objects associations.
notes:

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (60) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

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 (136 between 1850 and 2024) (Total 136)
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
                Reference summaries :

                from: to:

                 or select by : (not exhaustive, explanation here)

Collections of Measurements


velocities : 4    PM : 3   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : 8C 1842+681

Link by name to the catalogue in VizieR :

BWE 1842+6806 IERS B1842+681 NVSS J184233+680925 1RXS J184233.0+680930 WISEA J184233.64+680925.2
WISE J184233.64+680925.2 WMAP J1842+6809 WMAP J1842+6807 WMAP J1842+6808 WMAP J1841+6809
WN B1842+6806 WN B1842.7+6806 Gaia DR3 2258763540516880640 Gaia DR1 2258763536221181824 Gaia DR2 2258763540516880640

Search by coordinates in Vizier (radius: 5 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

Currently no annotations available

add an annotation to this object

report an error concerning the data of this object



Store this result in Votable, in Ascii, or in the CDS portal

To bookmark this query, right click on this link: simbad:@299683 and select 'bookmark this link' or equivalent in the popup menu