Chi Piscium

Chi Piscium (χ Piscium) is a solitary,^[10] orange-hued star in the zodiac constellation of Pisces. It can be seen with the naked eye, having an apparent visual magnitude of +4.64.^[2] Based upon an annual parallax shift of 8.50 mas as seen from Earth,^[1] it is located about 384 light years from the Sun.

Chi Piscium

Location of χ Piscium (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Pisces
Right ascension	01h 11m 27.21877s[1]
Declination	+21° 02′ 04.7406″[1]
Apparent magnitude (V)	+4.64[2]
Characteristics
Evolutionary stage	red clump[3]
Spectral type	G8.5 III[4]
U−B color index	+0.83[2]
B−V color index	+1.02[2]
Astrometry
Radial velocity (Rv)	+15.04±0.21[5] km/s
Proper motion (μ)	RA: +39.32[1] mas/yr Dec.: −10.48[1] mas/yr
Parallax (π)	8.50±0.21 mas[1]
Distance	384 ± 9 ly (118 ± 3 pc)
Absolute magnitude (MV)	−1.13[6]
Details[7]
Mass	3.17±0.23 M☉
Radius	20.65±0.57 R☉
Luminosity	209.2±10.5 L☉
Surface gravity (log g)	2.33±0.05 cgs
Temperature	4,835±28 K
Metallicity [Fe/H]	−0.15±0.10 dex
Rotational velocity (v sin i)	10[8] km/s
Age	380±100 Myr
Other designations
χ Psc, 84 Piscium, BD+20°172, FK5 1032, HD 7087, HIP 5571, HR 351, SAO 74544[9]
Database references
SIMBAD	data

This is an evolved G-type giant star with a stellar classification of G8.5 III.^[4] There is a 94%^[7] chance that it is on the horizontal branch and is a red clump star,^[3] which means it is generating energy through helium fusion at its core. Chi Piscium is estimated to have 3.17 times the mass of the Sun, nearly 21 times the solar radius, and shines with 209 times the Sun's luminosity. It is around 380 million years old.^[7]

Naming

In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of χ 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, φ Piscium and ψ¹ Piscium. Consequently, the Chinese name for χ Piscium itself is 奎宿十五 (Kuí Sù shíwǔ, English: the Fifteenth Star of Legs.)^[11]