* 31 Com

Basic data :
* 31 Com -- Rotating Variable 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: * (*,AG,...), X (1AXG,2E,...), UV (2EUVE,EUVE,...), V* (NSV,V*), Ro* (2003AstL), NIR (2MASS), IR (IRAS), 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) : 12 51 41.9201696640 +27 32 26.565016812 (Optical) [ 0.0639 0.0625 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) : 12 49 15.8622131823 +27 48 44.827044890 [ 0.0639 0.0625 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) : 114.9546386830252 +89.5834943889891 [ 0.0639 0.0625 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 : -12.025 -8.119 [0.082 0.107 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) 0.94 [0.19] / z(spectroscopic) 0.000003 [0.000001] / cz 0.94 [0.19]    (Opt) A 2022yCat.1355....0G 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): 11.8467 [0.0993] A 2020yCat.1350....0G Spectral type is made of 3 parts: %coding is composed of 4 parts : the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities; a quality letter: A=best quality→E=worst quality, {� } =unknown quality % a quality letter: A=best quality -> E=worst quality, {� } =unknown quality bibcode : bibcode of the spectral type reference Spectral type: G0IIIp B 1989ApJS...71..245K 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 (14) : U 5.81 [~] C 2002yCat.2237....0D B 5.61 [~] C 2002yCat.2237....0D V 4.94 [~] C 2002yCat.2237....0D R 4.39 [~] C 2002yCat.2237....0D G 4.736375 [0.002848] C 2020yCat.1350....0G I 4.04 [~] C 2002yCat.2237....0D J 3.72 [~] C 2002yCat.2237....0D H 3.42 [~] C 2002yCat.2237....0D K 3.35 [~] C 2002yCat.2237....0D u (AB) 10.338 [0.007] C 2009ApJS..182..543A g (AB) 9.786 [0.007] C 2009ApJS..182..543A r (AB) 9.784 [0.007] C 2009ApJS..182..543A i (AB) 10.367 [0.011] D 2009ApJS..182..543A z (AB) 9.661 [0.011] D 2009ApJS..182..543A	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: FK Com variable star (see the GCVS).

* 31 Com	GSC 01995-02586	2RE J125141+273233	uvby98 100111812
AG+27 1261	HD 111812	RE J125139+273247	V* LS Com
1AXG J125141+2732	HIC 62763	RE J1251+273	WEB 11128
BD+28 2156	HIP 62763	ROT 1898	2XMM J125141.9+273226
Cl* Melotte 111 MGM 399	HR 4883	RX J1251.7+2732	3XMM J125141.9+273226
Cl* Melotte 111 BOU 47	IRAS 12492+2748	RX J1251.6+2732	YZ 27 6272
2E 2874	JP11 2310	1RXS J125142.1+273222	[ATZ98] D350
2E 1249.2+2748	2MASS J12514192+2732266	SAO 82537	[BOA98] 16
1ES 1249+27.8	N30 2963	SDSS J125141.84+273226.6	[HFE83] 907
2EUVE J1251+27.5	NSV 19505	SKY# 23925	[M60b]+28 448
EUVE J1251+27.5	PLX 2955	SRS 31332	[ZEH2003] RX J1251.7+2732 1
FAUST 3528	PLX 2955.00	TD1 16518	Gaia DR2 3961912034103154944
FK5 1332	PMC 90-93 927	TIC 450335368	Gaia DR3 3961912034103154944
GC 17455	PPM 102212	TYC 1995-2586-1
GCRV 7697	RBS 1170	UBV 11570
GEN# +1.00111812	2RE J1251+273	UBV M 18750

References (431 between 1850 and 2024) (Total 431) 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 : * 31 Com

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