The seven brightest stars of Ursa Major form the asterism known as the Big Dipper. Alioth is the known brightest star in the Big Dipper. It is one of a pulsating variable known as magnetic spectrum variables. Alioth has a surface temperature is approximately 9,900 deg K. Its magnitude varies between 1.77 and 1.80 over a period of 5.09 days. Alioth is approximately 80 light years from Earth. Ursa Major constellation contains the group of stars commonly called the Big Dipper.