Cygnus X-1 (black hole candidate)

URI: https://gptkb.org/entity/Cygnus_X-1_(black_hole_candidate)
GPTKB entity
Statements (29)
Predicate Object
gptkbp:instanceOf binary star system
black hole candidate
gptkbp:accretionDisk present
gptkbp:alternativeName gptkb:4U_1956+35
gptkb:HDE_226868
gptkb:V1357_Cygni
gptkbp:apparentMagnitude 8.95
gptkbp:component 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
https://www.w3.org/2000/01/rdf-schema#label Cygnus X-1 (black hole candidate)
gptkbp:jet relativistic jets observed
gptkbp:locatedIn gptkb:constellation_Cygnus
gptkbp:mass about 19 solar masses (companion star)
about 21 solar masses (black hole)
gptkbp:namedFor X-ray astronomy team led by Riccardo Giacconi
gptkbp:notableFor first strong black hole candidate
gptkbp:orbitType 5.6 days
gptkbp:partOf gptkb:Milky_Way_Galaxy
gptkbp:radioSource yes
gptkbp:rightAscension 19h 58m 21.7s
gptkbp:significance evidence for existence of black holes
gptkbp:spectralType gptkb:O9.7_Iab_(companion_star)
gptkbp:X-raySource yes
gptkbp:bfsParent gptkb:Constellation_Cygnus
gptkbp:bfsLayer 7