  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 11m 27.21877s[1] |
| Declination | +21° 02′ 04.7406″[1] |
| Apparent magnitude (V) | +4.64[2] |
| Characteristics | |
| Spectral type | G8.5 III[3] |
| U−Bcolor index | +0.83[2] |
| B−Vcolor index | +1.02[2] |
| Astrometry | |
| Radial velocity (Rv) | +15.04±0.21[4] 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[5] |
| Details[6] | |
| 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[7] 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[8] | |
| Database references | |
| SIMBAD | data |
Chi Piscium (χ Piscium) is a solitary,[9] orange-huedstar in thezodiacconstellation ofPisces. It can be seen with the naked eye, having anapparent visual magnitude of +4.64.[2] Based upon an annualparallax shift of 8.50 mas as seen from Earth,[1] it is located about 384 light years from the Sun.
This is anevolvedG-typegiant star with astellar classification of G8.5 III.[3] There is a 94%[6] chance that it is on thehorizontal branch and is ared clump star,[10] which means it is generating energy throughhelium fusion at its core. Chi Piscium is estimated to have 3.17 times themass of the Sun, nearly 21 times thesolar radius, and shines with 209 times the Sun's luminosity. It is around 380 million years old.[6]
InChinese,奎宿 (Kuí Sù), meaningLegs (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 andψ¹ Piscium. Consequently, theChinese name for χ Piscium itself is奎宿十五 (Kuí Sù shíwǔ, English:the Fifteenth Star of Legs.)[11]
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