|
gptkbp:instanceOf
|
gptkb:star
|
|
gptkbp:alsoKnownAs
|
gptkb:HD_77581
Vela X-1 primary
|
|
gptkbp:apparentMagnitude
|
6.9
|
|
gptkbp:binarySystem
|
gptkb:Vela_X-1
|
|
gptkbp:catalogue
|
gptkb:Henry_Draper_Catalogue
|
|
gptkbp:catalogueNumber
|
gptkb:HD_77581
|
|
gptkbp:constellation
|
Vela
|
|
gptkbp:declination
|
-40° 33′ 16.9″
|
|
gptkbp:diameter
|
~30 solar radii
|
|
gptkbp:discoveredBy
|
19th century
|
|
gptkbp:distanceFromEarth
|
~1,900 light-years
|
|
gptkbp:eccentricity
|
0.09
|
|
gptkbp:hasCompanion
|
Vela X-1 (neutron star)
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
B0.5 Ib (HD 77581)
|
|
gptkbp:luminosity
|
~440,000 times solar luminosity
|
|
gptkbp:mass
|
~23 solar masses
|
|
gptkbp:metallicity
|
~solar
|
|
gptkbp:notableFor
|
companion to Vela X-1 X-ray source
|
|
gptkbp:orbitType
|
8.964 days
|
|
gptkbp:parallax
|
1.72 mas
|
|
gptkbp:properMotionRA
|
-5.13 mas/yr
8.06 mas/yr
|
|
gptkbp:radialVelocity
|
-1.0 km/s
|
|
gptkbp:rightAscension
|
09h 02m 06.85s
|
|
gptkbp:spectralType
|
B0.5 Ib
|
|
gptkbp:surfaceGravity
|
log(g) ~2.9
|
|
gptkbp:temperature
|
~25,000 K
|
|
gptkbp:variableType
|
ellipsoidal variable
|
|
gptkbp:bfsParent
|
gptkb:Vela_X-1
|
|
gptkbp:bfsLayer
|
7
|