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Phi Piscium
Quadruple star system in the constellation Pisces / From Wikipedia, the free encyclopedia
Phi Piscium, Latinized from φ Piscium, is a quadruple star[6] system approximately 380 light years away in the constellation Pisces. It consists of Phi Piscium A, with a spectral type of K0III, and Phi Piscium B.[5] Phi Piscium A possesses a surface temperature of 3,500 to 5,000 kelvins. Some suggest the only visible companion in the Phi Piscium B sub-system is a late F dwarf star, while others suggest it is a K0 star. The invisible component of the Phi Piscium B sub-system is proposed to have a spectral type of M2V.[7] The star system has a period of about 20½ years and has a notably high eccentricity of 0.815.[4]
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Pisces |
Right ascension | 01h 13m 44.94617s[1] |
Declination | +24° 35′ 01.3249″[1] |
Apparent magnitude (V) | 4.676 (A)/9.11 (B) |
Characteristics | |
φ Psc A | |
Spectral type | K0III[2] |
U−B color index | +0. |
B−V color index | +1.03 |
φ Psc B | |
Spectral type | K0 |
U−B color index | +0.25 |
B−V color index | +0.92 |
Astrometry | |
Radial velocity (Rv) | 5.9 km/s |
Proper motion (μ) | RA: 16.901[1] mas/yr Dec.: −21.415[1] mas/yr |
Parallax (π) | 8.1541 ± 0.2028 mas[1] |
Distance | 400 ± 10 ly (123 ± 3 pc) |
Absolute magnitude (MV) | −0.67[3] |
Orbit[4] | |
Companion | φ Psc B |
Period (P) | 7473±3 d yr |
Eccentricity (e) | 0.815±0.005 |
Argument of periastron (ω) (secondary) | 71.9±1.7° |
Details | |
A | |
Radius | 23.63+0.66 −1.36[1] R☉ |
Luminosity | 249.6±7.1[1] L☉ |
Surface gravity (log g) | 2.75[2] cgs |
Temperature | 4,720+142 −65[1] K |
Metallicity [Fe/H] | −0.08[3] dex |
Other designations | |
Database references | |
SIMBAD | data |
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