7C 1557+5633

Query : 7C 1557+5633
C.D.S. - SIMBAD4 rel 1.7 - 2019.09.23CEST18:11:13

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


Basic data :
7C 1557+5633 -- 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 (7C,BWE,...), BLL (Ref,[VV2000b],...), gam (1FGL,2FGL,...), Bla ([MGL2009],[MGL2015]), IR (2MASS,WISE), X (Ref,1RXS), * (Gaia), BL? (Ref), QSO (Ref), AGN (Ref)
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 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) :
15 58 48.2888061057 +56 25 14.120355021 (Optical) [ 0.0773 0.0859 90 ] A 2018yCat.1345....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] : coordinates error major axis, minor axis (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) :
15 57 41.5050616596 +56 33 41.669286922 [ 0.0773 0.0859 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] : coordinates error major axis, minor axis (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) :
087.5904725344888 +45.7739076499268 [ 0.0773 0.0859 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 :
0.080 -0.075 [0.146 0.221 90] A 2018yCat.1345....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) 76898 [~] / z(spectroscopic) 0.300 [~] / cz 89938 [~]
   D 2011NewA...16..503M
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 (7) :
B 18.08 [~] D 2010A&A...518A..10V
V 17.54 [~] D 2010A&A...518A..10V
R 17.2 [~] E 2009A&A...495..691M
G 17.4001 [0.0172] C 2018yCat.1345....0G
J 14.904 [0.043] C 2003yCat.2246....0C
H 13.983 [0.044] C 2003yCat.2246....0C
K 13.237 [0.041] C 2003yCat.2246....0C
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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!).
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 (41) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

7C 1557+5633 FIRST J155848.3+562514 MY 155740.1+562513.0 [MGL2009] BZB J1558+5625
BWE 1557+5634 GB6 J1558+5625 NVSS J155848+562514 [MGL2015] 5BZB J1558+5625
6C 155742+563358 GB6 B1557+5633 1RXS J155846.4+562535 [VV2000b] J155848.5+562514
7C 155741.70+563343.00 87GB 155742.8+563401 TXS 1557+565 [VV2003b] J155848.5+562514
8C 1557+565 ICRF J155848.2+562514 VCS3 J1558+5625 [VV2006b] J155848.5+562514
CLASS J155848.2901+562514.108 IVS B1557+565 VIPS 926 [VV2010b] J155848.3+562514
CRATES J155848+562524 JVAS B1557+565 VIPS J15588+5625 Gaia DR2 1621714848503992832
1FGL J1558.9+5627 JVAS J1558+564 WB 1557+5634 Gaia DR1 1621714848503992832
2FGL J1559.0+5627 JVAS J1558+5625 WISE J155848.30+562514.1
3FGL J1558.9+5625 2MASS J15584829+5625143 WISE J155848.29+562514.2
3FHL J1558.8+5626 MY 155740.1+563340.6 [HMI96] 1557+5633

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References (61 between 1850 and 2019) (Total 61)
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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Collections of Measurements


PM : 1   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : 7C 1557+5633

Link by name to the catalogue in VizieR :

BWE 1557+5634 FIRST J155848.3+562514 2MASS J15584829+5625143 NVSS J155848+562514 1RXS J155846.4+562535
WISE J155848.30+562514.1 WISE J155848.29+562514.2 Gaia DR2 1621714848503992832 Gaia DR1 1621714848503992832

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

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2019.09.23-18:11:13

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