Name twin quasar

Basic data :
8C 0958+561 -- Quasar 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 (2014ApJS,8C,...), QSO (2010A&A,KODIAQ,...), X (1E,RIXOS,...), * (SBSS,Gaia), MIR (WISEA,WISE), LeQ (2010MmSAI), LeI ([RGH85]), Opt (SDSS) 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) : 10 01 20.6918953728 +55 53 55.593949272 (Optical) [ 0.0401 0.0410 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) : 09 57 57.2613660930 +56 08 22.566003597 [ 0.0401 0.0410 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) : 157.5694800133507 +48.1869999737969 [ 0.0401 0.0410 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 : -0.037 0.006 [0.053 0.064 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) 211972 [~] / z(emission) 1.414 [~] / cz 423907 [~]    (Opt) C 2017AJ....154..114O 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): 0.0483 [0.0766] 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 (8) : B 17.16 [~] D 2010A&A...518A..10V V 16.95 [~] D 2010A&A...518A..10V G 17.108419 [0.004049] C 2020yCat.1350....0G u (AB) 17.2251 [0.0255] C 2020ApJS..250....8L g (AB) 17.1134 [0.0277] C 2020ApJS..250....8L r (AB) 16.9234 [0.0249] C 2020ApJS..250....8L i (AB) 16.8075 [0.0298] C 2020ApJS..250....8L z (AB) 16.8607 [0.0246] C 2020ApJS..250....8L	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: lensed by YGKOW G1, lensed images are [RGH85] A and [RGH85] B The X-ray source 1RXS J100121.5+555351 was identified with the active galaxy nucleus SDSS J100120.84+555349.6 by Anderson et al. (2007AJ....133..313A). See also Specfind radio flux densities.

8C 0958+561	NAME Twin Quasar	RX J1001.3+5553	[HB93] 0957+561A
BWE 0957+5608	NVSS J100121+555355	1RXS J100121.5+555351	[RGH85] A
6C 095757+560821	QSO B0957+561A	SBSS 0957+561	[VV2000] J100120.8+555354
7C 095757.60+560823.00	QSO B0956+56A	SDSS J100120.68+555355.9	[VV2003] J100120.8+555354
1E 0957.9+5608	QSO B0957+5608A	SDSS J100120.69+555355.6	[VV2006] J100120.8+555354
1E 0957.9+5607	QSO J1001+5553A	TXS 0957+561	[VV2010] J100120.8+555354
1E 0957+56.1	QSO J1001+5553	VLSS J1001.3+5553	[VV96] J100120.8+555354
FIRST J100121.1+555357	QSO B0957+561	WB 0957+5608	[VV98] J100120.8+555354
GB6 J1001+5553	RGB J1001+558A	WISEA J100120.68+555355.4	[ZEH2003] RX J1001.3+5553 1
GB6 B0957+5608	RGB J1001+558C	WISE J100120.68+555355.4	EQ 0957+56
87GB 095758.5+560808	RGB J1001.4+5553	WN B0957.9+5608	Gaia DR3 1045166002126206848
IERS B0957+561	RIXOS 252-31	YGKOW 83	Gaia DR2 1045166002126206848
KODIAQ J100120+555355	RX J100120.3+555349	[BDW2002] q0957+5608a

References (734 between 1850 and 2024) (Total 734) 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 : Name twin quasar

Link by name to the catalogue in VizieR :

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:Name twin quasar and select 'bookmark this link' or equivalent in the popup menu