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a star, the fifth-magnitude companion of Mizar in the handle of the Big Dipper.
Historical Examples

They saw and named Alcor, thousands of years before telescopes were invented, and long before there were any books to help them.
Earth and Sky Every Child Should Know Julia Ellen Rogers

Alcor (al´-kôr), g Ursæ Majoris, “the cavalier” or “the rider.”
A Field Book of the Stars William Tyler Olcott

Alcor is indeed distant from Mizar by about one-third the apparent diameter of the moon, yet no one would think so!
Astronomy of To-day Cecil G. Dolmage

Just above it is a very small star that astronomers call Alcor, or the rider.
Scouting For Girls, Official Handbook of the Girl Scouts Girl Scouts

Its distance is a little over half that between Mizar and Alcor.
Astronomy with an Opera-glass Garrett Putman Serviss

To be able to see Alcor with the naked eye means that one has excellent eyesight.
Boy Scouts Handbook Boy Scouts of America

The naked eye perceives near it a smaller star, named Alcor.
Pleasures of the telescope Garrett Serviss

A person with good eyesight can see quite near to it a fifth magnitude star, known under the name of Alcor.
Astronomy of To-day Cecil G. Dolmage

A subset of ALGOL.
[Sammet 1969, p. 180].


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