|
gptkbp:instanceOf
|
gptkb:star
gptkb:variable_star
|
|
gptkbp:apparentMagnitude
|
3.23
|
|
gptkbp:catalogue
|
gptkb:Henry_Draper_Catalogue
gptkb:Hipparcos_Catalogue
gptkb:WDS_Catalogue
gptkb:Bright_Star_Catalogue
gptkb:FK5_Catalogue
gptkb:SAO_Catalogue
|
|
gptkbp:constellation
|
gptkb:Cepheus
|
|
gptkbp:declination
|
+70° 33′ 38″
|
|
gptkbp:diameter
|
~6.5 solar radii
|
|
gptkbp:discoveredVariability
|
1902
|
|
gptkbp:distanceFromEarth
|
690 light years
|
|
gptkbp:galaxyType
|
B1IV
|
|
gptkbp:hasCompanion
|
gptkb:Beta_Cephei_B
gptkb:Beta_Cephei_C
|
|
gptkbp:isPrototypeOf
|
gptkb:Beta_Cephei_variable_stars
|
|
gptkbp:luminosity
|
~15,000 times Sun
|
|
gptkbp:mass
|
~12 solar masses
|
|
gptkbp:metallicity
|
−0.16 [Fe/H]
|
|
gptkbp:namedAfter
|
gptkb:constellation_Cepheus
|
|
gptkbp:otherName
|
gptkb:Alfirk
gptkb:BD+70_1068
gptkb:FK5_813
gptkb:HD_205021
gptkb:HIP_106032
gptkb:HR_8220
gptkb:SAO_19702
gptkb:WDS_J21287+7034
|
|
gptkbp:parallax
|
4.74 mas
|
|
gptkbp:properMotionRA
|
+12.87 mas/yr
+2.21 mas/yr
|
|
gptkbp:radialVelocity
|
−18.2 km/s
|
|
gptkbp:rightAscension
|
21h 28m 39.6s
|
|
gptkbp:rotationPeriod
|
28 km/s
|
|
gptkbp:spectralType
|
B1IV
|
|
gptkbp:temperature
|
26,000 K
|
|
gptkbp:variabilityPeriod
|
0.1905 days
|
|
gptkbp:variant
|
gptkb:Beta_Cephei_variable
|
|
gptkbp:bfsParent
|
gptkb:Beta_Cephei_variable
|
|
gptkbp:bfsLayer
|
6
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Beta Cephei
|