  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 30m 11.11444s[1] |
| Declination | +06° 08′ 37.7577″[1] |
| Apparent magnitude (V) | +4.84[2] |
| Characteristics | |
| Spectral type | K4 III[2] |
| B−Vcolor index | 1.38[2] |
| Astrometry | |
| Radial velocity (Rv) | +34.19[2] km/s |
| Proper motion (μ) | RA: +292.00[1]mas/yr Dec.: −45.95[1]mas/yr |
| Parallax (π) | 10.73±0.19 mas[1] |
| Distance | 304 ± 5 ly (93 ± 2 pc) |
| Absolute magnitude (MV) | −0.37[3] |
| Details | |
| Mass | 1.25[2] M☉ |
| Radius | 37[4] R☉ |
| Luminosity | 186[2] L☉ |
| Surface gravity (log g) | 2.07[5] cgs |
| Temperature | 4,126±27[2] K |
| Metallicity[Fe/H] | −0.39[3] dex |
| Rotational velocity (v sin i) | 1.0[6] km/s |
| Age | 5.57[2] Gyr |
| Other designations | |
| μ Psc,98 Piscium,BD+05°194,FK5 2099,HD 9138,HIP 7007,HR 434,SAO 109926,WDS J01302+0609A[7] | |
| Database references | |
| SIMBAD | data |
Mu Piscium (μ Piscium) is a solitary,[8] orange-huedstar in thezodiacconstellation ofPisces. It is visible to the naked eye with anapparent visual magnitude of 4.84.[2] Based upon an annualparallax shift of 10.73 mas as seen from Earth,[1] it is located about 304 light years from theSun. Given this distance, it has a relatively highproper motion, advancing 296 mas per year across the sky.[9]
This is anevolvedK-typegiant star with astellar classification of K4 III.[2] It has an estimated 1.25[2] times themass of the Sun and, at the age of 5.6 billion years, has expanded to about 37[4] times theSun's radius. From this enlargedphotosphere, it is radiating 186[2] times theSun's luminosity at aneffective temperature of 4,126 K.[2] It has a magnitude 12.02visual companion at anangular separation of 209.30 arc seconds along aposition angle of 298°, as of 2012.[10]
InChinese,外屏 (Wài Píng), meaningOuter Fence, refers to an asterism consisting of μ Piscium,δ Piscium,ε Piscium,ζ Piscium,ν Piscium,ξ Piscium andα Piscium. Consequently, theChinese name for μ Piscium itself is外屏四 (Wài Píng sì, English:the Fourth Star of Outer Fence.)[11]
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