Pi Piscium
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 37m 05.91523s |
| Declination | +12° 08′ 29.5186″ |
| Apparent magnitude (V) | 5.60 (5.56 + 9.56) |
| Characteristics | |
| Spectral type | F0 V + KV |
| Astrometry | |
| Radial velocity (Rv) | −1.0 km/s |
| Proper motion (μ) | RA: −77.29 mas/yr Dec.: +9.13 mas/yr |
| Parallax (π) | 28.50±0.97 mas |
| Distance | 114 ± 4 ly (35 ± 1 pc) |
| Absolute magnitude (MV) | +2.94 |
| Details | |
| A | |
| Mass | 1.42 M☉ |
| Radius | 1.68 R☉ |
| Luminosity | 5.45 L☉ |
| Surface gravity (log g) | 4.16 cgs |
| Temperature | 6,810 K |
| Metallicity [Fe/H] | −0.10 dex |
| Rotational velocity (v sin i) | 105.9 km/s |
| Age | 2.0 Gyr |
| B | |
| Mass | 0.75 M☉ |
| Radius | 0.69 R☉ |
| Luminosity | 0.207 L☉ |
| Temperature | 4,700 K |
| Other designations | |
| π Psc, 102 Piscium, BD+11°205, FK5 1046, GC 1954, HD 9919, HIP 7535, HR 463, SAO 92536, PPM 117498 | |
| Database references | |
| SIMBAD | data |
Pi Piscium (π Piscium) is a spectroscopic binary star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.60. Based upon an annual parallax shift of 28.50 mas as seen from Earth, it is 114 light years distant. It is a member of the thin disk population of the Milky Way.
The primary, of apparent magnitude 5.56, is an ordinary F-type main-sequence star with a stellar classification of F0 V. At the estimated age of two billion years, it is about 55% of the way through its main sequence lifetime and still has a relatively high rate of spin with a projected rotational velocity of 105.9 km/s. The star has 1.42 times the mass of the Sun and 1.68 of the Sun's radius. It is radiating 5.5 times the Sun's luminosity at an effective temperature of 6,810 K. At that temperature, Pi Piscium A has a yellow-white hue, as many F-type stars.
The secondary, of apparent magnitude 9.56, is a K-dwarf star. It is 0.75 times as massive than the Sun, 1.68 times as large, and has 21% of the luminosity. Its effective temperature is 4,700 K, giving it an orange hue typical of K-type stars.
Analysis of its motion suggest Pi Piscium may be a member of the Ursa Major association, but higher-quality observations are needed to confirm this.