Mu Andromedae
star in the constellation Andromeda
Mu Andromedae is a binary star system in the northern constellation of Andromeda. Its Bayer designation is Latinized from μ Andromedae, and abbreviated Mu And or μ And, respectively. The system has an apparent visual magnitude of 3.87, making it readily visible to the naked eye. Based upon parallax measurements, it is located at a distance of approximately 122 light-years (37 parsecs) from Earth. In the constellation, the star is situated about halfway between the bright star Mirach to the southwest and the Andromeda Galaxy (M31) to the northeast.
The spectrum of this star matches a stellar classification of A5 V, indicating that it is an A-type main sequence star. It has 2.2 times the mass of the Sun and three times the Sun's radius. The star is radiating about 40 times the luminosity of the Sun from its outer envelope at an effective temperature of 8,320 K, giving it the characteristic white glow of an A-type star. It is estimated to be about 724 million years old, with a relatively high projected rotational velocity of 75 km/s.
In 2007, Mu Andromedae was found to be a tidally-locked close binary system with an unseen companion.
“Mu Andromedae” enters the record as star in the constellation Andromeda. Crown Archives preserves that source wording while asking what Andromedae, star and constellation can confirm, complicate or overturn.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Feb 24, 2026. The linked authority identifier is Q1150445. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2007.
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This entry incorporates text from “Mu Andromedae” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.