Arcturus

Arcturus ( /ɑrkˈtjʊərəs/; α Boo, α Boötis, Alpha Boötis) is the brightest star in the constellation Boötes and the northern celestial hemisphere. With a visual magnitude of −0.04, it is the fourth brightest star in the night sky, after −1.46 magnitude Sirius, −0.86 magnitude Canopus, and −0.27 magnitude Alpha Centauri. It is a relatively close star at only 36.7 light-years from Earth, and, together with Vega and Sirius, one of the most luminous stars in the Sun's neighborhood.