- Alcor (stars.astro.illinois.edu)
ALCOR (80 Ursae Majoris). Alcor, forever tied to Mizar, is hardly ever spoken of unless as “Mizar and Alcor,” a naked eye double in the tail of Ursa Major that are 11.8 minutes of arc apart and that the Arabs referred to as the “horse and rider.”
- Alcor (star) (Wikipedia)
Alcor (/ˈælkɔːr/) is a binary star system in the constellation of Ursa Major. It is the fainter companion of Mizar, the two stars forming a naked eye double in the handle of the Big Dipper (or Plough) asterism in Ursa Major. The two both lie about 83 light-years away from the Sun, as measured by the Hipparcos astrometry satellite.
