4C -02.81

Query : 4C -02.81 C.D.S. - SIMBAD4 rel 1.225 - 2015.08.31CEST08:48:11

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
4C -02.81 -- BL Lac - type object
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 (Ref,4C,Cul,ICRF,IERS,IVS​,1Jy,MRC,MSH,NEWPS5​,OHIO,PKS,PMN,RORF​,UT,VSOP,WMAP,[DSJ85]​,[GR92],[WCO2009],[WPW2003]), QSO (Ref,QSO,[HB93],[VV2000],[VV2003],[VV2006]​,[VV2010]), BLL (Ref,[VV98b]), Bla ([DGT2001],[MGL2009]), AGN (Ref,CGRaBS), IR (2MASS,WISE), X (Ref,2E), gam (1FGL,2FGL), Q? (FBQS), G (LEDA), cm (AT20G)
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] : coordinates error major axis, minor axis (in mas at epoch defined in your output options),
    position angle (in degrees North to East of the specified coordinate frame)
  • 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) :
21 34 10.30956 -01 53 17.2386 ( Radio ) [ 0.35 0.16 0 ] A 2010AJ....139.1695L
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] : coordinates error major axis, minor axis (in mas at epoch defined in your output options),
    position angle (in degrees North to East of the specified coordinate frame)
  • 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
FK5 coord. (ep=J2000 eq=2000) :
21 34 10.310 -01 53 17.24 [ 0.35 0.16 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] : coordinates error major axis, minor axis (in mas at epoch defined in your output options),
    position angle (in degrees North to East of the specified coordinate frame)
  • 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) :
21 31 35.14 -02 06 40.0 [ 0.35 0.16 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] : coordinates error major axis, minor axis (in mas at epoch defined in your output options),
    position angle (in degrees North to East of the specified coordinate frame)
  • 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) :
052.3897 -36.5036 [ 0.35 0.16 0 ]
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) 203415 [~] / z(~) 1.285 [~] / cz 385233 [~]   (~) D 1997MNRAS.284...85D
Syntax of angular size is : "maj-axis min-axis angle (incl) (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (incl) : inclination (in units of 15° from 0 to 7)
  • (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):
0.0000132 0.0000060 -1 (~) (Rad) D 2010AJ....139.1713C
Syntax of fluxes (or magnitudes) is : "filter-name flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, J, H, K, u, g, r, i, z
  • 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) :
B 18.6 [~] D ~
V 19.0 [~] D ~
R 18.87 [~] D 2008ApJS..175...97H
J 17.095 [0.209] D 2003yCat.2246....0C
H 16.229 [0.276] D 2003yCat.2246....0C
K 15.723 [0.233] D 2003yCat.2246....0C
SIMBAD with radius arcmin
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within radius 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!).

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (46) :

4C -02.81 IVS B2131-021 QSO B2131-0206 [HB93] 2131-021
AT20G J213410-015316 1Jy 2131-021 QSO J2134-0153 [MGL2009] BZU J2134-0153
CGRaBS J2134-0153 LEDA 2818139 RORF 2131-021 [MGL2009] BZB J2134-0153
Cul 2131-021 2MASS J21341033-0153168 UT 2131-021 [VV2000] J213410.3-015317
2E 4488 MRC 2131-021 VSOP J2134-0153 [VV2003] J213410.3-015317
2E 2131.5-0206 MSH 21-0-11 WISE J213410.30-015317.1 [VV2006] J213410.3-015317
EQ 2131-02 NEWPS5 J2134-0153 WMAP 20 [VV2010] J213410.3-015317
FBQS J2134-0153 OHIO X -053 WMAP J2134-0154 [VV98b] J213410.3-015317
1FGL J2134.0-0203 PKS 2131-021 WMAP J2134-0153 [WCO2009] J213415-015935
2FGL J2133.8-0154 PKS J2134-0153 [DGT2001] B2131-021 [WPW2003] J2134-0153
ICRF J213410.3-015317 PMN J2134-0153 [DSJ85] 2131-021
IERS B2131-021 QSO B2131-021 [GR92] 2131-021

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References (260 between 1850 and 2015)
Simbad bibliographic survey began in 1950 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Measurements (6 types) :


Einstein : 1    ISO : 3    posa : 1    velocities : 7    Z : 6    ze : 1   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database

Catalogue information from VizieR :

Generic search by coordinates (radius: 5 arcsec)

4C -02.81 IERS B2131-021 2MASS J21341033-0153168 PKS 2131-021 PKS J2134-0153
PMN J2134-0153 VSOP J2134-0153

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 .
The list of all annotations to SIMBAD objects can be found here .

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2015.08.31-08:48:11

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