IERS B1557+565

Basic data :
7C 1557+5633 -- 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 (2019ApJS,7C,...), BLL (2010ApJ,[VV2000b],...), gam (1FGL,2FGL,...), IR (2MASS,WISEA,...), Bla ([MGL2009],[MML2015]), X (2009A&A,1RXS), QSO (2016A&A), AGN (2011ApJ), BL? (2011NewA), * (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) : 15 58 48.2889478488 +56 25 14.121578928 (Optical) [ 0.0568 0.0647 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) : 15 57 41.5053303804 +56 33 41.688232156 [ 0.0568 0.0647 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) : 087.5904760287949 +45.7739081036512 [ 0.0568 0.0647 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 : 0.004 -0.154 [0.073 0.088 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) 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 17.428566 [0.011947] C 2020yCat.1350....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	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: See also Specfind radio flux densities.

7C 1557+5633	FIRST J155848.3+562514	MY 155740.1+562513.0	9Y-MST J1558+5625
BWE 1557+5634	GB6 J1558+5625	NVSS J155848+562514	[HMI96] 1557+5633
6C 155742+563358	GB6 B1557+5633	1RXS J155846.4+562535	[MGL2009] BZB J1558+5625
7C 155741.70+563343.00	87GB 155742.8+563401	TIC 161824117	[MML2015] 5BZB J1558+5625
8C 1557+565	ICRF J155848.2+562514	TXS 1557+565	[VV2000b] J155848.5+562514
CLASS J155848.2901+562514.108	IERS B1557+565	VCS3 J1558+5625	[VV2003b] J155848.5+562514
CRATES J155848+562524	IVS B1557+565	VIPS J15588+5625	[VV2006b] J155848.5+562514
1FGL J1558.9+5627	JVAS B1557+565	VIPS 926	[VV2010b] J155848.3+562514
2FGL J1559.0+5627	JVAS J1558+564	WB 1557+5634	Gaia EDR3 1621714848503992832
3FGL J1558.9+5625	JVAS J1558+5625	WISEA J155848.29+562514.2	Gaia DR1 1621714848503992832
4FGL J1558.8+5625	2MASS J15584829+5625143	WISE J155848.30+562514.1	Gaia DR2 1621714848503992832
3FHL J1558.8+5626	MY 155740.1+563340.6	WISE J155848.29+562514.2

References (76 between 1850 and 2022) (Total 76) 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 : IERS B1557+565

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