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Nu Piscium
Star in the constellation Pisces / From Wikipedia, the free encyclopedia
Nu Piscium (ν Piscium) is an orange-hued binary star[7] system in the zodiac constellation of Pisces. Prior to the formation of the modern constellation boundaries in 1930, it was designated 51 Ceti in the Cetus constellation.[8] Nu Piscium is visible to the naked eye, having a combined apparent visual magnitude of 4.44.[2] Based upon an annual parallax shift of 8.98 mas as seen from Earth,[1] it is located about 365 light years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Pisces |
Right ascension | 01h 41m 25.89414s[1] |
Declination | +05° 29′ 15.4018″[1] |
Apparent magnitude (V) | 4.44[2] |
Characteristics | |
Spectral type | K3 IIIb[2] |
B−V color index | 1.37[2] |
Astrometry | |
Radial velocity (Rv) | 0.6±0.18[1] km/s |
Proper motion (μ) | RA: −23.323 mas/yr[1] Dec.: 3.505 mas/yr[1] |
Parallax (π) | 8.9275 ± 0.1567 mas[1] |
Distance | 365 ± 6 ly (112 ± 2 pc) |
Absolute magnitude (MV) | −0.78[3] |
Details | |
ν Psc A | |
Mass | 1.66[2] M☉ |
Radius | 34.58+0.81 −0.83[4] R☉ |
Luminosity | 380[2] L☉ |
Surface gravity (log g) | 1.91[5] cgs |
Temperature | 4,154[2] K |
Metallicity [Fe/H] | −0.16[5] dex |
Age | 3.41[2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
The primary, component A, is an evolved, K-type giant star with a stellar classification of K3 IIIb.[2] It is a weak barium star, indicating that the atmosphere was previously enriched by accretion of s-process elements from what is now a white dwarf companion.[9] The giant has 1.66[2] times the mass of the Sun and has expanded to about 35[4] times the Sun's radius. It is about 3.4 billion years old and is radiating 380 times the Sun's luminosity from its photosphere at an effective temperature of 4,154 K.[2]