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physical object > natural object > celestial body > star > supergiant > red supergiant

red supergiant
subject			fact

red supergiant	has definition A supergiant with spectral type M. Red supergiants are the largest stars in the universe: if put in place of the Sun, some would touch Saturn. The two brightest red supergiants in Earth's sky are Betelgeuse and Antares.
	is a kind of supergiant
supergiant	has luminosity class I
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

Kinds of red supergiant :

• Antares (13 facts) (alpha Sco, HR 6134) - A red M1 Ib supergiant. It has a B3 V companion, which is a radio source.
• Betelgeuse (8 facts) (alpha Ori) - A red supergiant star in the constellation Orion and the brightest red supergiant in Earth's sky., A red semiregular variable supergiant. Betelgeuse is also a strong infrared emitter - at 2 µ the brightest in the sky.

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