4C 18.47

Basic data :
4C 18.47 -- 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: Sy1 (), Rad (4C,BWE,...), QSO (2015MNRAS,QSO,...), BLL (2014ApJS), AGN (2021ApJ,[VV2010c]), MIR (WISEA,WISE), G (LEDA), * (Gaia), X (RX), NIR (2MASS), IR (2MASSI), Opt (SDSS), ev (ZTF) 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) : 16 09 11.2572400152 +17 56 16.284977412 (Optical) [ 0.2631 0.2663 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) : 16 06 56.6544375792 +18 04 06.478735106 [ 0.2631 0.2663 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) : 032.2977915639830 +43.7128206953600 [ 0.2631 0.2663 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 : 0.154 0.065 [0.278 0.303 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) 86711 [318] / z(spectroscopic) 0.34680 [0.00106] / cz 103968.0 [317.8]    D 2009ApJS..182..543A 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): 0.2616 [0.3204] A 2020yCat.1350....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 (11) : B 20.21 [~] D 2010A&A...518A..10V V 19.60 [~] D 2010A&A...518A..10V G 19.304276 [0.026526] C 2020yCat.1350....0G J 16.673 [0.166] C 2010AJ....139.2360S H 15.639 [0.157] C 2010AJ....139.2360S K 14.978 [0.132] C 2010AJ....139.2360S u (AB) 19.5971 [0.0282] C 2020ApJS..250....8L g (AB) 19.6809 [0.0220] C 2020ApJS..250....8L r (AB) 19.1150 [0.0156] C 2020ApJS..250....8L i (AB) 18.9990 [0.0181] C 2020ApJS..250....8L z (AB) 18.1251 [0.0252] 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: See also Specfind radio flux densities.

4C 18.47	MITG J160913+1756	SDSS J160911.25+175616.2	[HB93] 1606+180
BWE 1606+1804	MRC 1606+180	SDSS J160911.26+175616.2	[VV2000] J160911.4+175615
DA 402	NRAO 1606+18	TGSSADR J160911.1+175616	[VV2003] J160911.4+175615
EF B1606+1804	NVSS J160911+175616	TIC 103868986	[VV2006] J160911.4+175615
GB6 B1606+1804	OHIO S 113	TXS 1606+180	[VV2010c] J160911.4+175615
87GB 160655.4+180413	PKS J1609+1757	VLSSr J160911.1+175616	[VV96] J160911.4+175615
GLEAM J160910+175616	PKS 1606+180	VRO 18.16.02	[VV98] J160911.4+175615
LEDA 2819524	QSO B1606+180	WB 1606+1804	Gaia DR3 1199811036972579456
2MASS J16091126+1756160	RGB J1609.2+1756	WISEA J160911.25+175615.8	Gaia DR2 1199811036972579456
2MASSI J1609112+175616	RGB J1609+179	WISE J160911.25+175615.8
MITG J160911+1755	RX J1609.1+1756	ZTF18aaxmrom

References (57 between 1850 and 2024) (Total 57) 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 : 4C 18.47

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