Mizar and Alcor are in a sextuplet system in the constellation Ursa Major. Mizar of Zeta Ursa Majoris (actually 4 stars) is one of the stars in the asterism "the Big Dipper" or "the Plough".Alcor or...
Almost all of them have binary stars.Maybe the most famous "double star" is the second one from the end of Ursa Major's tail(the Big Dipper's handle). The pair of stars there are both bright enough...