|
gptkbp:instanceOf
|
gptkb:stellar-mass_black_hole_candidate
gptkb:binary_star_system
|
|
gptkbp:apparentMagnitude
|
8.95
|
|
gptkbp:catalogueNumber
|
gptkb:4U_1956+35
gptkb:BD+34_3815
gptkb:HIP_98298
gptkb:SAO_69181
gptkb:HDE_226868
gptkb:2MASS_J19582177+3512063
gptkb:GSC_03179-00929
gptkb:V1357_Cyg
|
|
gptkbp:component
|
gptkb:black_hole
supergiant star HDE 226868
|
|
gptkbp:declination
|
+35° 12′ 06″
|
|
gptkbp:discoveredBy
|
1964
|
|
gptkbp:distanceFromEarth
|
about 7,200 light-years
|
|
gptkbp:epoch
|
gptkb:J2000
|
|
gptkbp:hasAccretionDisk
|
yes
|
|
gptkbp:locatedIn
|
gptkb:constellation_Cygnus
|
|
gptkbp:massOfBlackHole
|
about 21 solar masses
|
|
gptkbp:massOfCompanionStar
|
about 19 solar masses
|
|
gptkbp:notableFor
|
first widely accepted black hole candidate
|
|
gptkbp:orbitType
|
5.6 days
|
|
gptkbp:otherName
|
gptkb:Cygnus_X-1
|
|
gptkbp:parallax
|
0.0432 mas
0.5111 mas
|
|
gptkbp:rightAscension
|
19h 58m 21.7s
|
|
gptkbp:spectralType
|
gptkb:O9.7_Iab
|
|
gptkbp:variableType
|
X-ray binary variable
|
|
gptkbp:X-raySource
|
yes
|
|
gptkbp:bfsParent
|
gptkb:The_Black_Hole_of_Cygnus_X-1
|
|
gptkbp:bfsLayer
|
6
|
|
http://www.w3.org/2000/01/rdf-schema#label
|
V1357 Cygni
|