Phi Persei

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Stars of Perseus
Phi Persei
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 1h 43m 39.62s
Declination 50° 41' 19.6"
Apparent magnitude (V) 4.01
Absolute magnitude (V) -2.70
Distance 716 ly
(219.63 pc)
Spectral type B2Vpe
Other designations
Seif, φ Persei, φ Per, Phi Per, BD+49°444, FK5 57, GC 2102, HD 10516, HIP 8068, HR 496, PPM 26670, SAO 22554.[1]

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.[2] 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.[3]


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.).[4]


  1. ^ "HD 10516 -- Variable Star with rapid variations". SIMBAD Astronomical Database. Retrieved 2007-04-01. 
  2. ^ 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, doi:10.1093/mnras/189.3.601 
  3. ^ 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. 
  4. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日

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