|
gptkbp:instanceOf
|
gptkb:binary_star_system
gptkb:black_hole
|
|
gptkbp:accretionDisk
|
yes
|
|
gptkbp:apparentMagnitude
|
8.95
|
|
gptkbp:blackHoleSpin
|
near maximal
|
|
gptkbp:catalogueNumber
|
gptkb:4U_1956+35
gptkb:BD+34_3815
gptkb:HDE_226868
gptkb:V1357_Cygni
|
|
gptkbp:component
|
gptkb:black_hole
supergiant star HDE 226868
|
|
gptkbp:declination
|
+35° 12′ 06″
|
|
gptkbp:discoveredBy
|
1964
|
|
gptkbp:distanceFromEarth
|
about 6,070 light-years
|
|
gptkbp:hasCompanion
|
gptkb:HDE_226868
|
|
gptkbp:hasJet
|
yes
|
|
gptkbp:locatedIn
|
gptkb:constellation_Cygnus
|
|
gptkbp:massOfBlackHole
|
about 21 solar masses
|
|
gptkbp:massOfCompanionStar
|
about 19 solar masses
|
|
gptkbp:notable_for
|
first X-ray source widely accepted as a black hole
|
|
gptkbp:notableFor
|
first strong black hole candidate
|
|
gptkbp:orbitType
|
5.6 days
|
|
gptkbp:parallax
|
0.54 mas
|
|
gptkbp:partOf
|
gptkb:Milky_Way_Galaxy
|
|
gptkbp:properMotionRA
|
-3.78 mas/yr
-6.40 mas/yr
|
|
gptkbp:radioSource
|
yes
|
|
gptkbp:rightAscension
|
19h 58m 21.7s
|
|
gptkbp:spectralType
|
gptkb:O9.7_Iab
|
|
gptkbp:variableStar
|
gptkb:V1357_Cygni
|
|
gptkbp:X-raySource
|
yes
|
|
gptkbp:bfsParent
|
gptkb:4U_1956+35
|
|
gptkbp:bfsLayer
|
8
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Cyg X-1
|