Epoch J2000.0 Equinox J2000.0
|Right ascension||1h 43m 39.62s|
|Declination||50° 41' 19.6"|
|Apparent magnitude (V)||4.01|
|Absolute magnitude (V)||-2.70|
Phi Persei (Phi Per, φ Persei, φ Per) is a Class B2Vpe, fourth-magnitude star in the constellation Perseus. Due to its isolation and distance from Cassiopeia, Andromeda and the rest of Perseus, John Flamsteed never took thought to assign a number and constellation to Phi Persei.
Phi Persei is binary consisting of a blue main sequence primary of class B2 and an apparent magnitude of 4.01 and a hot subdwarf secondary. The primary has 9.3 times the radius of the Sun. Phi Persei is also a variable star with rapid variations in its brightness and spectrum. The Phi Persei stellar system is located about 716 light-years from Earth.
Phi Persei was a latter designation of 54 Andromedae.
In Chinese, 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, refers to an asterism consisting of φ Persei, γ Andromedae, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli, γ Trianguli and δ Trianguli. Consequently, φ Persei itself is known as 天大將軍二 (Tiān Dà Jiāng Jūn èr, English: the Second Star of Heaven's Great General.).
- "HD 10516 -- Variable Star with rapid variations". SIMBAD Astronomical Database. Retrieved 2007-04-01.
- Underhill, A. B. et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, Bibcode:1979MNRAS.189..601U
- Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy, Vol.18, NO. 3/AUG, P.209, 1987 18: 212. Bibcode:1987JHA....18..209W.
- (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日
- "HST Press release on the φ Per binary system". NASA. Retrieved 2010-09-25.