In 1650 Mizar was the first double one of these discovered; today we know it's actually a quadruple
These systems are smaller than open star clusters, which have more 
.... for double and multiple stars can cause confusion as binary stars discovered 
in .... KOI-2626 is the first quadruple star system with a planet that is potentially... [DOC] [TLE] Mizar and Alcor - Wikipedia [PAR] Mizar and Alcor form a naked eye double star in the handle of the Big Dipper (or 
Plough) asterism in the constellation of Ursa Major.