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.”
https://github.com/davepinch/pinchy.cc/blob/master/content/sites/stars.astro.illinois.edu/sow/alcor.md
