3C 254

Query : 3C 254

Basic data :
3C 254 -- 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: 		Sy1 (), Rad (2014ApJS,3C,...), QSO (2009ApJ,QSO,...), X (2007AJ,1AXG,...), * (GSC2,USNO,...), UV (2EUVE,EUVE,...), MIR (WISEA,WISE), AGN (2007AJ), G (LEDA), gam (INTREF), NIR (2MASS), IR (2MASSI), 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) : 		11 14 38.7251836992 +40 37 20.329281156 (Optical) [ 0.0709 0.1003 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) : 		11 11 53.3141335327 +40 53 41.583675718 [ 0.0709 0.1003 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) : 		172.6416301023608 +65.9287346544267 [ 0.0709 0.1003 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 : 		0.137 0.040 [0.102 0.122 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) 150399 [21] / z(spectroscopic) 0.73593 [0.00007] / cz 220626.3 [21.0]
   (Opt) C 2012ApJS..203...21A
Syntax of morphological type is : mtype quality bibcode
  • mtype : Hubble morphological class (spirals, ellipticals, etc)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the morphological type reference
Morphological type: 		E D ~
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 (11) :
B 17.62 [~] D 2010A&A...518A..10V
V 17.42 [~] D 2010A&A...518A..10V
G 17.547155 [0.011424] C 2020yCat.1350....0G
J 15.946 [0.079] C 2010AJ....139.2360S
H 16.012 [0.171] C 2010AJ....139.2360S
K 14.815 [0.121] C 2010AJ....139.2360S
u (AB) 17.536 [0.010] C 2015ApJS..219...12A
g (AB) 17.155 [0.005] B 2015ApJS..219...12A
r (AB) 17.079 [0.005] B 2015ApJS..219...12A
i (AB) 17.231 [0.006] B 2015ApJS..219...12A
z (AB) 17.041 [0.011] C 2015ApJS..219...12A
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
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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 (65) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

3C 254 GALEX J111438.7+403720 RGB J1114.6+4037 [BHB98] J111438.6+403720
1AXG J111438+4037 GB6 B1111+4053 RX J1114.6+4037 [GW2008] CoNFIG 93
B3 1111+408 87GB 111152.7+405333 1RXS J111439.4+403735 [HB93] 1111+408
BWE 1111+4053 GRA J1113+40 S4 1111+408 [S77] 177
3C 254.0 GSC2 N23202112432 S4 1111+40 [VV2000] J111438.6+403720
4C 40.28 IERS B1111+408 SDSS J111438.71+403720.3 [VV2003] J111438.6+403720
CJ1 1111+408 INTREF 443 TIC 39142572 [VV2006] J111438.6+403720
3CR 254 IVS B1111+408 TXS 1111+408 [VV2010] J111438.6+403720
CXOMP J111438.7+403720 LEDA 2817631 USNO-B1.0 1306-00216819 [VV96] J111438.6+403720
DA 298 2MASS J11143868+4037202 USNO-A2.0 1275-07880063 [VV98] J111438.6+403720
DB 80 2MASSI J1114386+403720 UT 1111+408 [WTW94] 1111+408
2E 2426 MY 111153.2+403714.2 VRO 40.11.01 [ZEH2003] RX J1114.6+4037 1
2E 1111.8+4053 NRAO 369 WB 1111+4053 Gaia DR3 765492639641411456
2EUVE J1114+40.6 NVSS J111438+403720 WISEA J111438.72+403720.2 Gaia DR2 765492639641411456
EUVE J1114+40.6 QSO J1114+4037 WISE J111438.72+403720.2
FIRST J111438.8+403719 QSO B1111+4053 WN B1111.8+4053
FIRST J111438.6+403720 QSO B1111+408 [BDW2002] q1111+4053

References (324 between 1850 and 2024) (Total 324)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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                Reference summaries :

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Collections of Measurements


velocities : 16    PM : 2   

   

Observing logs


herschel : 2    IUE : 2   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : 3C 254

Link by name to the catalogue in VizieR :

3C 254 BWE 1111+4053 3C 254.0 4C 40.28 3CR 254
2E 2426 EUVE J1114+40.6 FIRST J111438.8+403719 FIRST J111438.6+403720 GALEX J111438.7+403720
IERS B1111+408 2MASS J11143868+4037202 2MASSI J1114386+403720 NVSS J111438+403720 1RXS J111439.4+403735
SDSS J111438.71+403720.3 USNO-B1.0 1306-00216819 USNO-A2.0 1275-07880063 WISEA J111438.72+403720.2 WISE J111438.72+403720.2
WN B1111.8+4053 Gaia DR3 765492639641411456 Gaia DR2 765492639641411456

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