Alcor is a star in the constellation Ursa Major, often associated with Mizar as part of a visual double star system. It is located approximately 81 light-years from Earth and is visible to the naked eye.
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Alcor and Mizar form a visual double star, meaning they appear close together in the sky but are not necessarily gravitationally bound.
Alcor has an apparent magnitude of about 4.0, making it moderately bright and visible without telescopes.
The Alcor-Mizar pair has been historically used as a test of eyesight.
Alcor is classified as an A5V type star, indicating it is a main-sequence star with a surface temperature around 8,000 Kelvin.
Recent studies suggest that Alcor may have its own companion star, making it part of a more complex multiple-star system.