  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23h 42m 02.80612s[1] |
| Declination | +01° 46′ 48.1484″[1] |
| Apparent magnitude (V) | 4.49[2] |
| Characteristics | |
| Spectral type | A7 V[3] |
| U−Bcolor index | +0.09[2] |
| B−Vcolor index | +0.20[2] |
| Astrometry | |
| Radial velocity (Rv) | 6.7[4] km/s |
| Proper motion (μ) | RA: −129.70[1]mas/yr Dec.: −154.80[1]mas/yr |
| Parallax (π) | 30.59±0.19 mas[1] |
| Distance | 106.6 ± 0.7 ly (32.7 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.92[5] |
| Details | |
| Mass | 1.806[3] M☉ |
| Radius | 2.0403±0.0451[3] R☉ |
| Luminosity | 13.3897±0.1692[3] L☉ |
| Surface gravity (log g) | 4.08[4] cgs |
| Temperature | 7,734±80[3] K |
| Metallicity[Fe/H] | 0.02[4] dex |
| Rotational velocity (v sin i) | 70[6] km/s |
| Age | 583±20[6] Myr |
| Other designations | |
| λ Psc,18 Piscium,BD+00°5037,FK5 1620,HD 222603,HIP 116928,HR 8984,SAO 128336[7] | |
| Database references | |
| SIMBAD | data |
Lambda Piscium,Latinized fromλ Piscium, is a solitary,[8] white-huedstar in thezodiacconstellation ofPisces. With anapparent visual magnitude of 4.49,[2] it is visible to the naked eye, forming the southeast corner of the "Circlet"asterism in Pisces. Based upon a measured annualparallax shift of 30.59 mas as seen from Earth,[1] it is located 107 light years distant from theSun. Lambda Piscium is a member of theUrsa Major Stream, lying among the outer parts, or corona, of thismoving group of stars that roughly follow a common heading through space.[9]
This well-studied star[4] has astellar classification A7 V,[3] indicating it is anA-type main-sequence star that is generating energy throughhydrogen fusion at itscore. It has 1.8 times themass of the Sun and double theSun's radius. The star is radiating 13.3 times theSun's luminosity from itsphotosphere at aneffective temperature of 7,734 K.[3] Lambda Piscium is around 583 million years old and is spinning with aprojected rotational velocity of 70 km/s.[6]
InChinese,雲雨 (Yún Yǔ), meaningCloud and Rain, refers to an asterism consisting of λ Piscium,κ Piscium,12 Piscium and21 Piscium. Consequently, theChinese name for λ Piscium itself is雲雨四 (Yún Yǔ sì, English:the Fourth Star of Cloud and Rain.)[10]
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