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physical object > natural object > celestial body > collection of stars > star system > binary star > SMC X-1

SMC X-1 (2U 0115-73)
subject			fact

SMC X-1	is a part of Tucana
	is a part of Small Magellanic Cloud
	has synonym 2U 0115-73
	has orbital period 3.89-day
	has definition An X-ray source in the Small Magellanic Cloud. It is a binary system. Identified with Sanduleak No. 160, a B0 I supergiant (mv = + 13.6). Because no radial-velocity variations are apparent in Sk 160, the mass of the X-ray emitter must be small relative to Sk 160 (about 2 Msun if Sk 160 is 20 Msun), unlike the compact member of CygX-1.
	is an instance of binary star
binary star	has number of stars 2
star system	has abundance half the stars in the solar neighborhood are members of star systems
star	has star surface temperature
	has spectral type
	has V magnitude
	has B magnitude
	has U magnitude
	has position on celestial sphere from the point of view of Earth
	has parallax from the point of view of Earth's orbit
	has proper motion
	has radiation at surface which is diffused out from the hotter core
	has energy source gravitational contraction and or fusion
	has energy production which takes place primarily within the core
	has surface density which depends on luminosity class
	has surface temperature greater than 1000 Kelvin
	has apparent magnitude
	has absolute magnitude
	has age
	has catalog star catalog
	has material hydrogen, helium
	has velocity determined from proper motion and radial velocity
	has mass greater than 0.08 the sun's mass
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has momentum
	has temperature
	has volume
	has extent

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