Bootes: Difference between revisions

Located 36.7 light-years from Earth, Arcturus, or Alpha Boötis, is the brightest star in Boötes and the fourth brightest star in the sky at an apparent magnitude of −0.05;[21] It is also the brightest star north of the celestial equator, just shading out Vega andCapella. Its name comes from the Greek for "bear-keeper". An orange giant of spectral class K1.5III, Arcturus is an ageing star that has exhausted its core supply of hydrogen and cooled and expanded to a diameter of 27 solar diameters, equivalent to approximately 32 million kilometers. Though its mass is approximately one solar mass (M☉), Arcturus shines with 133 times the luminosity of the Sun (L☉). Some people on the earth are originally from Arcturus, and are called [[Arcturians]]. <ref>[http://en.wikipedia.org/wiki/Bootes Bootes]</ref>