Vela X-1

GPTKB entity

Statements (28)
Predicate Object
gptkbp:instanceOf X-ray binary star system
gptkbp:apparentMagnitude 6.9
gptkbp:catalogue SIMBAD: Vela X-1
gptkbp:component white dwarf
supergiant star HD 77581
gptkbp:declination -40° 33′ 16.9″
gptkbp:discoveredBy 1972
gptkbp:distanceFromEarth ~6,500 light-years
gptkbp:eccentricity 0.0898
https://www.w3.org/2000/01/rdf-schema#label Vela X-1
gptkbp:locatedIn constellation Vela
gptkbp:luminosity ~440,000 L☉ (HD 77581)
gptkbp:massOfCompanionStar ~23 solar masses
gptkbp:massOfNeutronStar ~1.9 solar masses
gptkbp:notableFor first eclipsing X-ray binary discovered
gptkbp:orbitType 8.964 days
gptkbp:otherDesignation gptkb:4U_0900-40
gptkb:HD_77581
gptkb:HIP_44400
gptkbp:parallax 0.5022 mas
gptkbp:radialVelocity -1.0 km/s
gptkbp:rightAscension 09h 02m 06.86s
gptkbp:spectralType gptkb:B0.5_Ib_(HD_77581)
gptkbp:temperature 25,000 K (HD 77581)
gptkbp:variableType binary star system
gptkbp:X-raySource yes
gptkbp:bfsParent gptkb:binary_star_system
gptkbp:bfsLayer 6