|
gptkbp:instanceOf
|
gptkb:star
variable star
|
|
gptkbp:apparentMagnitude
|
4.8
-8.0
|
|
gptkbp:catalogueNumber
|
gptkb:2MASS_J20174721+3801582
gptkb:BD+37_3871
gptkb:HD_193237
gptkb:HIP_100044
gptkb:HR_7763
gptkb:SAO_69641
|
|
gptkbp:constellation
|
gptkb:Cygnus
|
|
gptkbp:declination
|
+38° 01′ 58″
|
|
gptkbp:diameter
|
76 solar radii
|
|
gptkbp:discoveredBy
|
gptkb:Willem_Janszoon_Blaeu
|
|
gptkbp:discoveredIn
|
1600
|
|
gptkbp:distanceFromEarth
|
5900 light years
|
|
gptkbp:epoch
|
gptkb:J2000
|
|
gptkbp:hasPeculiarSpectrum
|
yes
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
P Cygni
|
|
gptkbp:luminosity
|
560,000 times Sun
|
|
gptkbp:mass
|
30 solar masses
|
|
gptkbp:metallicity
|
0.0 [Fe/H]
|
|
gptkbp:notableFor
|
massive outbursts
prototype of P Cygni profile
prototype of P Cygni profile in spectroscopy
strong stellar wind
|
|
gptkbp:otherName
|
gptkb:2MASS_J20174721+3801582
gptkb:BD+37_3871
gptkb:HD_193237
gptkb:HIP_100044
gptkb:HR_7763
gptkb:SAO_69641
|
|
gptkbp:parallax
|
0.56 mas
|
|
gptkbp:properMotionRA
|
-3.37 mas/yr
-6.46 mas/yr
|
|
gptkbp:radialVelocity
|
-26.7 km/s
|
|
gptkbp:rightAscension
|
20h 17m 47.2s
|
|
gptkbp:rotationPeriod
|
40 km/s
|
|
gptkbp:spectralType
|
B1Ia+
|
|
gptkbp:temperature
|
18,700 K
|
|
gptkbp:variableStar
|
gptkb:P_Cyg
|
|
gptkbp:variableType
|
variable star
|
|
gptkbp:bfsParent
|
gptkb:Cygnus
gptkb:Luminous_blue_variable
|
|
gptkbp:bfsLayer
|
6
|