Phi Andromedae

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Phi Andromedae (φ And / φ Andromedae) is a binary star in the constellation Andromeda. It also has the traditional name Keun Nan Mun, which it shares with χ Andromedae. The name derives from the Mandarin phrase 軍南門 jūnnánmén, meaning "the south gate of the camp".

The primary component, Phi Andromedae A, is a blue-white B-type subgiant with an apparent magnitude of +4.6. The companion star, Phi Andromedae B, is a blue-white B-type main sequence dwarf with an apparent magnitude of 5.6. The two stars are separated by 0.64 arcseconds and have an orbital period of 371.6 years. The combined brightness of the system is +4.26 magnitudes. It is approximately 736 light years from Earth.

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