Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:star
|
| gptkbp:apparentMagnitude |
8.95
|
| gptkbp:catalogue |
gptkb:Henry_Draper_Catalogue
|
| gptkbp:constellation |
gptkb:Cygnus
|
| gptkbp:diameter |
17 solar radii
|
| gptkbp:discoveredBy |
gptkb:William_Herschel
1784 |
| gptkbp:distanceFromEarth |
6070 light years
|
| gptkbp:hasCompanion |
gptkb:Cygnus_X-1_(black_hole)
|
| https://www.w3.org/2000/01/rdf-schema#label |
HD 226868
|
| gptkbp:luminosity |
340,000 times solar luminosity
|
| gptkbp:mass |
21 solar masses
|
| gptkbp:otherName |
gptkb:V1357_Cygni
|
| gptkbp:parallax |
0.54 mas
|
| gptkbp:partOf |
gptkb:Cygnus_X-1_system
|
| gptkbp:properMotionRA |
-3.78 mas/yr
-6.36 mas/yr |
| gptkbp:radialVelocity |
-5.4 km/s
|
| gptkbp:spectralType |
O9.7Iab
|
| gptkbp:temperature |
31,000 K
|
| gptkbp:variableType |
ellipsoidal variable
|
| gptkbp:bfsParent |
gptkb:BD+35_3876
|
| gptkbp:bfsLayer |
7
|