Alpha Cygni

URI: https://gptkb.org/entity/Alpha_Cygni

GPTKB entity

Predicate	Object
gptkbp:instanceOf	gptkb:star red supergiant
gptkbp:age	~10 million years
gptkbp:alsoKnownAs	gptkb:Deneb
gptkbp:apparentMagnitude	1.25
gptkbp:BayerDesignation	gptkb:α_Cygni
gptkbp:catalogueNumber	gptkb:BD+45_3250 gptkb:FK5_777 gptkb:HD_197345 gptkb:HIP_102098 gptkb:HR_7924 gptkb:SAO_49941 gptkb:2MASS_J20312599+4516491 gptkb:ADS_14107 gptkb:GC_28817 gptkb:GSC_03564-02886 gptkb:IRAS_20387+4504 gptkb:PLX_4372 gptkb:TYC_3564-2886-1 gptkb:WDS_J20313+4517A AG+45 2107 PPM 41860
gptkbp:colorIndexB-V	+0.09 −0.19
gptkbp:constellation	gptkb:Cygnus
gptkbp:declination	+45° 16′ 49″
gptkbp:diameter	~203 solar radii
gptkbp:distanceFromEarth	~2,600 light years
gptkbp:hasNoKnownCompanions	true
https://www.w3.org/2000/01/rdf-schema#label	Alpha Cygni
gptkbp:isFarthestFirstMagnitudeStar	true
gptkbp:isPoleStarOfMars	true
gptkbp:luminosity	~196,000 times Sun
gptkbp:mass	~19 solar masses
gptkbp:metallicity	−0.02
gptkbp:parallax	1.01 mas
gptkbp:partOf	gptkb:Summer_Triangle
gptkbp:properMotionRA	1.02 mas/yr 0.48 mas/yr
gptkbp:radialVelocity	−4.5 km/s
gptkbp:rightAscension	20h 41m 25.9s
gptkbp:spectralType	A2Ia
gptkbp:temperature	8,525 K
gptkbp:variableStar	true
gptkbp:variableType	gptkb:Alpha_Cygni_variable
gptkbp:visibleToNakedEye	true
gptkbp:bfsParent	gptkb:Deneb
gptkbp:bfsLayer	6