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physical object > naked eye object > naked eye star > Arcturus

Arcturus (Alpha Boötis, HR 5340)
subject			fact

Arcturus	has declination +19 10 57
	has right ascension 14 15 39.6
	has spectral type K1IIIbCN-1
	has V magnitude -0.04
	is a part of Boötes
	has synonym Alpha Boötis
	has synonym HR 5340
	has B-V magnitude 1.23
	has definition A beautiful orange star that is the brightest in the constellation Bootes and the fourth brightest in the night sky. It lies 34 light-years away and is a member of the thick-disk population. Historically, Arcturus is famous because it was one of the first stars to have its proper motion measured.
	has definition An old subgiant disk star (K2 IIIp, mv = 0.06) about 11 pc distant.
	is an instance of K star
	is an instance of bright giant
	is an instance of naked eye star
bright giant	has luminosity class II
K star	has color orange to red
	has surface temperature 3600 to 5000 K
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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