Alpha Crucis

Alpha Crucis, also called Acrux, brightest star in the southern constellation Crux (the Southern Cross) and the 13th brightest star in the sky. Alpha Crucis is about 320 light-years from Earth. It is a multiple star system consisting of three B-type stars, the spectroscopic binary α¹ and α², that are of roughly the same brightness and are close enough together to appear as one star to the naked eye. The stars of α¹ orbit around each other every 76 days, but it takes α¹ and α² about 1,500 years to orbit each other.