|
gptkbp:instanceOf
|
gptkb:star
red supergiant
|
|
gptkbp:apparentMagnitude
|
4.8
|
|
gptkbp:catalogue
|
gptkb:Henry_Draper_Catalogue
gptkb:Hipparcos_Catalogue
gptkb:Bright_Star_Catalogue
|
|
gptkbp:constellation
|
gptkb:Cassiopeia
|
|
gptkbp:declination
|
+60° 40′ 57″
|
|
gptkbp:diameter
|
~400 solar radii
|
|
gptkbp:discoveredBy
|
gptkb:William_Herschel
|
|
gptkbp:discoveredIn
|
1790
|
|
gptkbp:distanceFromEarth
|
~7,800 light-years
|
|
gptkbp:evolutionaryStage
|
post-red supergiant
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
V509 Cassiopeiae
|
|
gptkbp:luminosity
|
~330,000 times Sun
|
|
gptkbp:mass
|
~20 solar masses
|
|
gptkbp:metallicity
|
slightly subsolar
|
|
gptkbp:otherDesignation
|
gptkb:HD_217476
gptkb:HIP_113561
gptkb:HR_8752
|
|
gptkbp:parallax
|
0.42 mas
|
|
gptkbp:properMotionRA
|
-2.13 mas/yr
-1.13 mas/yr
|
|
gptkbp:radialVelocity
|
-43 km/s
|
|
gptkbp:rightAscension
|
22h 59m 35.3s
|
|
gptkbp:spectralType
|
F2Ia+
|
|
gptkbp:temperature
|
~8,000 K
|
|
gptkbp:variableType
|
semiregular variable
|
|
gptkbp:bfsParent
|
gptkb:Cassiopeia
gptkb:Cassiopeia_constellation
|
|
gptkbp:bfsLayer
|
7
|