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physical object > natural object > celestial body > collection of stars > star system > binary star > spectroscopic binary > Theta2 Orionis

Theta2 Orionis (2U 0525-06)
subject			fact

Theta2 Orionis	is a part of Orion
	has spectral type O9.5 Vp
	has synonym 2U 0525-06
	has orbital period 21.03 days
	has definition A spectroscopic binary tentatively identified with 2U 0525-06.
	is an instance of O star
	is an instance of spectroscopic binary
	is an instance of dwarf
dwarf	has symbol d
	has luminosity class V
O star	has lifetime 3 to 6 million years
	has color blue-white
	has surface temperature 35000 K
	has relative abundance rare
	has rotation velocity very high
	has absorption line He II
binary star	has number of stars 2
star	has star surface temperature
	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 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
star system	has abundance half the stars in the solar neighborhood are members of star systems
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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