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physical object > naked eye object > naked eye star > Altair

Altair (alpha Aql, HR 7557)
subject			fact

Altair	has declination +08 52 06
	has right ascension 19 50 46.9
	has spectral type A7 V
	has V magnitude 0.77
	has apparent magnitude mv = 0.78
	has distance 4.8 pc
	is a part of Aquila
	has synonym alpha Aql
	has synonym HR 7557
	has B-V magnitude 0.22
	has definition A bright A7 V star.
	is an instance of A star
	is an instance of dwarf
	is an instance of naked eye star
dwarf	has symbol d
	has luminosity class V
A star	has color white
	has surface temperature 10000 K
	has absorption line H 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
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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