ZW I 187

Basic data :
6C 172704+501607 -- 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 (2020A&A,6C,...), BLL (2010ApJ,[VV2000b],...), X (2009A&A,AX,...), gam (1FGL,2FGL,...), Bla (2016ApJS,[DGT2001],...), Bz? (2019A&A,3HSP,...), G (CGPG,LEDA,...), QSO (2016A&A,QSO,...), AGN (2011ApJ,CGRaBS), MIR (WISEA,WISE), BL? (2021MNRAS), V* (AAVSO), * (Gaia), NIR (2MASS) 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) : 17 28 18.6242294352 +50 13 10.469553996 (Optical) [ 0.0349 0.0352 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) : 17 27 04.3434223717 +50 15 31.202842314 [ 0.0349 0.0352 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) : 077.0677155400519 +33.5369108642523 [ 0.0349 0.0352 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 : -0.179 0.056 [0.046 0.046 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) 16036 [~] / z(spectroscopic) 0.055 [~] / cz 16489 [~]    D 2011NewA...16..503M Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode" maj-axis : major axis size (arc minutes) min-axis : minor axis size (arc minutes) angle : orientation angle (in degrees) (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): 0.197 0.177 160 (NIR) C 2006AJ....131.1163S 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 16.55 [~] D 2010A&A...518A..10V V 15.97 [~] D 2010A&A...518A..10V R 12.95 [~] D 2008ApJS..175...97H G 16.200966 [0.010866] C 2020yCat.1350....0G J 13.742 [0.054] C 2006AJ....131.1163S H 13.009 [0.059] C 2006AJ....131.1163S K 12.612 [0.091] C 2006AJ....131.1163S	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.

6C 172704+501607	FIRST J172818.6+501310	RGB J1728+502	9Y-MST J1728+5013
AX J1728.2+5013	GB6 J1728+5013	RGB J1728.3+5013	ZW I 187
1AXG J172815+5013	GB6 B1727+5015	RORF 1727+502	ZW II 77
BWE 1727+5015	87GB 172704.2+501535	RX J1728.3+5013	[AUO2003] J172818.63+501310.6
6C 172702+501554	1H 1727+502	RX J1728.2+5013	[DGT2001] B1727+502
7C 172703.50+501539.00	1H 1730+500	RX J172819.1+501309	[HB93] 1727+502A
CGPG 1727.1+5015	3HSP J172818.6+501310	1RXS J172818.3+501310	[IN88] 1727+502
CGRaBS J1728+5013	ICRF J172818.6+501310	SHEEP J1728.2+5013	[MGL2009] BZB J1728+5013
CLASS J172818.6236+501310.480	IERS B1727+502	TeV J1728+502	[MML2015] 5BZB J1728+5013
CRATES J172818+501315	IVS B1727+502	TGSSADR J172818.2+501315	[PGB2011] J1728+5013
2E 3909	LEDA 60348	TXS 1727+502	[VV2000b] J172818.6+501311
2E 1727.0+5015	2MASS J17281863+5013103	4U 1727+50	[VV2003b] J172818.6+501311
EF B1727+5015	2MASX J17281863+5013103	VER J1728+502	[VV2006b] J172818.6+501311
1ES 1727+50.2	NVSS J172818+501311	VIPS J17283+5013	[VV2010b] J172818.6+501311
1FGL J1727.9+5010	OHIO T 546	WB 1727+5015	[VV98b] J172818.6+501311
2FGL J1728.2+5015	PKS 1727+502	2WHSP J172818.5+501309	[ZEH2003] RX J1728.3+5013 1
3FGL J1728.3+5013	PKS 1727+50	WISEA J172818.63+501310.4	AAVSO 1725+50
4FGL J1728.3+5013	QSO B1727+502	WISE J172818.63+501310.5	Gaia DR3 1366729756901871104
1FHL J1728.3+5014	QSO B1728+502	WISE J172818.63+501310.4	Gaia DR1 1366729752606094336
2FHL J1728.2+5013	RBS 1649	WN B1727.0+5015	Gaia DR2 1366729756901871104
3FHL J1728.3+5013	RFC J1728+5013	XSS J17272+5025

References (375 between 1850 and 2024) (Total 375) 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 : ZW I 187

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