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physical object > naked eye object > naked eye star > Achernar

Achernar (alpha Eridani, HR 472)
subject			fact

Achernar	has declination -57 14 12
	has right ascension 1 37 42.9
	has spectral type B3Vpe
	has spectral type B5
	has V magnitude 0.46
	is a part of Eridanus
	has distance 35 pc
	has synonym alpha Eridani
	has synonym HR 472
	has B-V magnitude -0.16
	is an instance of naked eye star
	is an instance of B star
	is an instance of subgiant
subgiant	has luminosity class IV
B star	has color blue-white
	has surface temperature 11000 to 28000 K
	has absorption line He I
naked eye star	has been observed for many centuries
	is usually part of asterism
	is a part of celestial sphere
	is a part of Milky Way
	has apparent magnitude brighter than 5
star	has star surface temperature
	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 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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