Sigma Piscium

Sigma Piscium

Location of σ Piscium (circled)

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Pisces
Right ascension	01^h 02^m 49.09^s
Declination	+31° 48' 15.6"
Apparent magnitude (V)	+5.50
Distance	414 ly (127 pc)
Spectral type	G8III
Other designations
σ Piscium, σ Psc, Sigma Psc, 69 Piscium, BD+31°168, HD 6118, HIP 4889, HR 291, PPM 65899, SAO 54374.

Sigma Piscium (Sigma Psc, σ Piscium, σ Psc) is a yellow G-type giant with an apparent magnitude of +5.50. It is approximately 414 light years from Earth. It is also a double lined spectroscopic binary system with a orbital period of 81 days.^[1]

Sigma Piscium is moving through the Galaxy at a speed of 23.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,300 and 29,400 light years from the center of the Galaxy.^[2]

Sigma Piscium was a latter designation of 40 Andromedae.^[3]

Naming

In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of refers to an asterism consisting of σ Piscium, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, μ Andromedae, β Andromedae, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, σ Piscium itself is known as 奎宿十 (Kuí Sù shí, English: the Tenth Star of Legs.)^[4]

References

1. Konacki, Maciej; Lane, Benjamin F. (2004). "The Visual Orbits of the Spectroscopic Binaries HD 6118 and HD 27483 from the Palomar Testbed Interferometer". The Astrophysical Journal. 610 (1): 443–455. arXiv:astro-ph/0310729. Bibcode:2004ApJ...610..443K. doi:10.1086/421037.
2. Sigma Piscium (HIP 4889)
3. Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy, Vol.18, NO. 3/AUG, P.209, 1987. 18: 211. Bibcode:1987JHA....18..209W.
4. (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日