Phi Piscium Explained

Phi Piscium, Latinized from φ Piscium, is a quadruple star system approximately 380 light years away in the constellation Pisces. It consists of Phi Piscium A, with a spectral type of K0III, and Phi Piscium B. Phi Piscium A possesses a surface temperature of 3,500 to 5,000 kelvins. Some suggest the only visible companion in the Phi Piscium B sub-system is a late F dwarf star, while others suggest it is a K0 star. The invisible component of the Phi Piscium B sub-system is proposed to have a spectral type of M2V.[1] The star system has a period of about 20½ years and has a notably high eccentricity of 0.815.

Naming

In Chinese, Chinese: 奎宿 (Chinese: Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of refers to an asterism consisting of φ Piscium, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, μ Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, χ Piscium and ψ¹ Piscium. Consequently, φ Piscium itself is known as Chinese: 奎宿十四 (Chinese: Kuí Sù shí sì, en|the Fourteenth Star of Legs.)[2]

Notes and References

  1. R.F. Griffin . G.H. Herbig . Spectroscopic binary orbits from photoelectric radial velocities. Paper 100: Phi PISCIUM B . The Observatory . 1991 . 111 . 201–219 . 1991Obs...111..201G .
  2. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日