|
gptkbp:instanceOf
|
gptkb:supernova
|
|
gptkbp:age
|
about 350 years
|
|
gptkbp:alternativeName
|
gptkb:Cas_A
|
|
gptkbp:apparentMagnitude
|
6.0
|
|
gptkbp:catalogueNumber
|
gptkb:3C_461
|
|
gptkbp:contains
|
gptkb:white_dwarf
|
|
gptkbp:declination
|
+58° 48′ 54″
|
|
gptkbp:discoveredBy
|
gptkb:John_Flamsteed
|
|
gptkbp:discoveredIn
|
1680
|
|
gptkbp:distanceFromEarth
|
about 11,000 light-years
|
|
gptkbp:expandingAt
|
about 4,000–6,000 km/s
|
|
gptkbp:infraredPort
|
yes
|
|
gptkbp:locatedIn
|
constellation Cassiopeia
|
|
gptkbp:notableFor
|
brightest extrasolar radio source at frequencies above 1 GHz
|
|
gptkbp:observedBy
|
gptkb:Very_Large_Array
gptkb:Chandra_X-ray_Observatory
gptkb:Hubble_Space_Telescope
|
|
gptkbp:progenitorStarType
|
massive star
|
|
gptkbp:radioSource
|
yes
|
|
gptkbp:remnantDiameter
|
about 10 light-years
|
|
gptkbp:rightAscension
|
23h 23m 24s
|
|
gptkbp:studiedBy
|
supernova physics
neutron star cooling
shock wave propagation
|
|
gptkbp:supernovaExplosionDate
|
circa 1670s
|
|
gptkbp:type
|
Type IIb supernova remnant
|
|
gptkbp:XRaySource
|
yes
|
|
gptkbp:bfsParent
|
gptkb:Cassiopeia
|
|
gptkbp:bfsLayer
|
7
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Cassiopeia A
|