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physical object > natural object > celestial body > X-ray source > Cygnus X-1
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Cygnus X-1
(3U 1956+35)
subjectfact 
Cygnus X-1has period 5.5998 days2001-09-27 09:30:24.0
has secondary mass > 6 Msun2001-09-27 09:30:24.0
has primary mass 20 Msun2001-09-27 09:30:24.0
has inclination i ≈ 27°2001-09-27 09:30:24.0
has eccentricity e ≈ 0.062001-09-27 09:30:24.0
is a part of Cygnus2001-09-27 09:30:24.0
has distance 2.5 kpc2001-09-27 09:30:24.0
has synonym 3U 1956+352001-09-27 09:30:24.0
has definition A black hole candidate in the constellation Cygnus and a source of X-rays.has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:30:24.0
has definition An X-ray source. The visible component is the ninth-magnitude supergiant HDE 226868 (O9.7 Iab). It has rapid night-to-night variations in spectral features.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:30:24.0
is an instance of X-ray source2001-09-27 09:30:24.0
X-ray sourcehas wavelength X-ray2001-09-27 09:30:23.0
is a part of celestial sphere2001-09-27 09:30:23.0
celestial bodyhas spectra2001-09-27 09:30:09.0
physical objecthas location or center of gravity2001-09-27 09:27:27.0
has angular momentum2001-09-27 09:27:27.0
has mass2001-09-27 09:27:27.0
has velocity2001-09-27 09:27:27.0
has momentum2001-09-27 09:27:27.0
has temperature2001-09-27 09:27:27.0
has volume2001-09-27 09:27:27.0
has extent2001-09-27 09:27:27.0
has material2001-09-27 09:27:27.0

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