NGC 931

Basic data :
NGC 931 -- Seyfert 1 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: G (2016A&A,KUG,...), X (1AXG,2E,...), AGN ([HB91],[VV2000c],...), IR (IRAS,ISOSS,...), Sy1 (2013ApJS), QSO (QSO,[WTW94]), GiG ([CHM2007]), IG (VV), * (Gaia), gam (INTREF), Rad ([SUA2001]), Opt (SDSS) 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) : 02 28 14.4689104272 +31 18 41.469363324 (Optical) [ 0.0343 0.0327 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) : 02 25 16.5454225364 +31 05 17.896045103 [ 0.0343 0.0327 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) : 146.1140749415886 -27.1659544722601 [ 0.0343 0.0327 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 : -0.243 0.122 [0.050 0.045 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) 4988 [~] / z(emission) 0.016779 [~] / cz 5030.19 [~]    (Rad) D 2018ApJ...861...49H 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: Sbc D 2012AstL...38..475K 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): 1.720 0.585 75 (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 (11) : B 15.71 [~] D 2010A&A...518A..10V V 14.74 [~] D 2010A&A...518A..10V G 15.135272 [0.015859] C 2020yCat.1350....0G J 10.399 [0.018] C 2006AJ....131.1163S H 9.667 [0.025] C 2006AJ....131.1163S K 9.272 [0.020] C 2006AJ....131.1163S u (AB) 16.639 [0.009] B 2011yCat.2306....0A g (AB) 15.235 [0.003] B 2011yCat.2306....0A r (AB) 14.640 [0.003] B 2011yCat.2306....0A i (AB) 14.204 [0.003] B 2011yCat.2306....0A z (AB) 13.505 [0.003] B 2011yCat.2306....0A	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 931	2MASX J02281446+3118414	SWIFT J0228.4+3118	[KRL2007b] 22
1AXG J022814+3118	2MAXI J0228+314	UGC 1935	[SLK2004] 307
2E 573	MAXI J0229+315	UZC J022814.6+311841	[SUA2001] J022814.476+311841.49
2E 0225.2+3105	MCG+05-06-049	VV 1027	[VV2000c] J022814.4+311841
1ES 0225+31.0	Mrk 1040	Z 504-89	[VV2003c] J022814.4+311841
INTREF 113	PBC J0228.2+3119	Z 0225.3+3105	[VV2006c] J022814.4+311841
IRAS F02252+3105	PSCz Q02252+3105	[BTW2003] J0228+3115	[VV2010c] J022814.4+311841
IRAS 02252+3105	QSO B0225+310	[CHM2007] HDC 143 J022814.46+3118414	[VV98c] J022814.4+311841
ISOSS J02282+3118	1RXS J022814.6+311838	[CHM2007] LDC 176 J022814.46+3118414	[WTW94] 0225+310
KUG 0225+310	SDSS J022814.46+311841.5	[DML87] 47	Gaia DR2 132514485705558912
LEDA 9399	SWIFT J0228.1+3118	[HB91] 0225+310	Gaia DR3 132514485705558912

References (385 between 1850 and 2023) (Total 385) 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 : NGC 931

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