Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:star
|
| gptkbp:apparentMagnitude |
8.95
|
| gptkbp:catalogueNumber |
gptkb:BD+34_3815
|
| gptkbp:declination |
+35° 12′ 06″
|
| gptkbp:diameter |
about 17 solar radii
|
| gptkbp:discoveredBy |
early 20th century
|
| gptkbp:distanceFromEarth |
about 6,070 light-years
|
| gptkbp:hasCompanion |
gptkb:Cygnus_X-1_(black_hole)
|
| https://www.w3.org/2000/01/rdf-schema#label |
HDE 226868
|
| gptkbp:locatedIn |
gptkb:constellation_Cygnus
|
| gptkbp:luminosity |
about 400,000 times Sun
|
| gptkbp:mass |
about 21 solar masses
|
| gptkbp:metallicity |
slightly subsolar
|
| gptkbp:orbitType |
5.6 days
|
| gptkbp:otherDesignation |
gptkb:V1357_Cygni
|
| gptkbp:partOf |
gptkb:Cygnus_X-1_system
|
| gptkbp:radialVelocity |
-5.4 km/s
|
| gptkbp:rightAscension |
19h 58m 21.7s
|
| gptkbp:spectralType |
O9.7Iab
|
| gptkbp:temperature |
about 31,000 K
|
| gptkbp:variableType |
ellipsoidal variable
|
| gptkbp:bfsParent |
gptkb:The_Black_Hole_of_Cygnus_X-1
|
| gptkbp:bfsLayer |
5
|