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gptkbp:instanceOf
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gptkb:star
|
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gptkbp:alternativeName
|
V1687 Cygni
WR 140
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gptkbp:apparentMagnitude
|
6.85
|
|
gptkbp:binarySystem
|
yes
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gptkbp:binaryType
|
colliding-wind binary
|
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gptkbp:catalogue
|
gptkb:Henry_Draper_Catalogue
gptkb:Wolf-Rayet_Catalogue
Variable Star Catalogue
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gptkbp:constellation
|
gptkb:Cygnus
|
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gptkbp:declination
|
+43° 51′ 16.3″
|
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gptkbp:discoveredBy
|
gptkb:Paul_W._Merrill
|
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gptkbp:discoveredIn
|
1930
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gptkbp:distanceFromEarth
|
~1,300 parsecs
|
|
gptkbp:eccentricity
|
0.88
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
HD 193793
|
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gptkbp:luminosity
|
~1,000,000 times Sun (secondary)
~500,000 times Sun (primary)
|
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gptkbp:mass
|
~20 solar masses (primary)
~50 solar masses (secondary)
|
|
gptkbp:notableFor
|
gamma-ray emission
X-ray emission
dust formation at periastron
|
|
gptkbp:orbitType
|
7.94 years
|
|
gptkbp:parallax
|
0.08 mas
0.77 mas
|
|
gptkbp:rightAscension
|
20h 20m 27.98s
|
|
gptkbp:spectralType
|
WC7pd+O5-6
|
|
gptkbp:temperature
|
~40,000 K (secondary)
~70,000 K (primary)
|
|
gptkbp:variableType
|
Wolf-Rayet variable
|
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gptkbp:bfsParent
|
gptkb:Wolf–Rayet_stars
|
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gptkbp:bfsLayer
|
7
|