Statements (26)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:X-ray_binary_star_system
|
| gptkbp:apparentMagnitude |
6.9
|
| gptkbp:catalogue |
SIMBAD: Vela X-1
|
| gptkbp:component |
gptkb: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
|
| 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 |
gptkb:binary_star_system
|
| gptkbp:X-raySource |
yes
|
| http://www.w3.org/2000/01/rdf-schema#label |
Vela X-1
|