NGC 6251

Basic data :
NGC 6251 -- Seyfert 2 Galaxy 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: Sy2 (), Rad (2020A&A,6C,...), AGN (2008ApJS,CGRaBS,...), G (2016A&A,LEDA,...), gam (3EG,EGR,...), X (2009A&A,1AXG,...), Bla (2009A&A,[MGL2009],...), rG (2023ApJS,[LCF2001]), Sy1 (2020MNRAS), QSO (QSO), Bz? (2015Ap&SS), GiC ([WWB2000]), * (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) : 16 32 31.96989253 +82 32 16.3999044 (Radio) [ 0.0335066 0.0325 0 ] A 2020A&A...644A.159C 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 37 57.00834822 +82 38 18.5631115 [ 0.0335066 0.0325 0 ] 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) : 115.76378460853 +31.19583273555 [ 0.0335066 0.0325 0 ] 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 : -0.760 -0.143 [0.250 0.239 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) 5936 [~] / z(spectroscopic) 0.02 [~] / cz 5996 [~]    (Opt) D 2017ApJS..233....3T 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): 0.3216 [0.2182] A 2020yCat.1350....0G 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 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): 1.037 0.933 30 (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 (8) : U 15.24 [0.07] C 2010MNRAS.407.2475F B 14.66 [0.03] C 2010MNRAS.407.2475F V 12.89 [0.05] C 2010MNRAS.407.2475F R 7.62 [~] D 2008ApJS..175...97H G 18.172428 [0.012384] C 2020yCat.1350....0G J 10.060 [0.017] C 2006AJ....131.1163S H 9.307 [0.019] C 2006AJ....131.1163S K 9.026 [0.024] 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!).

NGC 6251	IERS B1637+826	S5 1637+826	[MHM2002] B1
1AXG J163223+8232	INTREF 701	S5 1637+82	[MHM2002] 1
6C 1636+8239	INTREF 686	TIC 159539373	[MML2015] 5BZU J1632+8232
CGRaBS J1632+8232	1Jy 1637+826	UGC 10501	[VV2000c] J163232.1+823217
CJ1 1637+826	KNOWS J163235+823228	UZC J163231.7+823216	[VV2003c] J163232.1+823217
2E 3741	LEDA 58472	WB 1636+8240	[VV2006c] J163232.1+823217
2E 1637.8+8238	2MASS J16323197+8232165	WMAP J1632+8232	[VV2010c] J163232.1+823217
3EG J1621+8203	2MASX J16323175+8232165	9Y-MST J1632+8232	[VV98c] J163232.0+823216
EGR J1607+8216	MCG+14-08-010	Zel 1637+8238	[WWB2000] 1
1FGL J1635.4+8228	NPM1G +82.0085	Z 1638.0+8239	[ZEH2003] RX J1632.5+8232 2
2FGL J1629.4+8236	NVSS J163231+823216	Z 367-13	Gaia DR3 1722820478889987328
3FGL J1630.6+8232	NVSS J163226+823220	[GGC2003] 1	Gaia DR2 1722820478889987840
4FGL J1630.6+8234	QSO B1637+826	[HB91] 1637+826
3FHL J1632.2+8232	RX J1632.5+8232	[LCF2001] J1632+825
ICRF J163231.9+823216	1RXS J163230.3+823214	[MGL2009] BZU J1632+8232

References (708 between 1850 and 2023) (Total 708) 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

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External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : NGC 6251

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