Upsilon Piscium
Upsilon Piscium is a solitary, white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +4.75. Based upon an annual parallax shift of 10.59 mas as seen from Earth, it is located about 308 light years from the Sun. The star is drifting further away with a heliocentric radial velocity of +6 km/s.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 19m 27.99289s |
| Declination | +27° 15′ 50.6155″ |
| Apparent magnitude (V) | 4.752 |
| Characteristics | |
| Spectral type | A3 V |
| U−B color index | +0.10 |
| B−V color index | +0.03 |
| Astrometry | |
| Radial velocity (Rv) | +5.8±2.7 km/s |
| Proper motion (μ) | RA: +22.98 mas/yr Dec.: −11.12 mas/yr |
| Parallax (π) | 10.59 ± 0.25 mas |
| Distance | 308 ± 7 ly (94 ± 2 pc) |
| Absolute magnitude (MV) | −0.13 |
| Details | |
| Mass | 2.84±0.05 M☉ |
| Radius | 2.2 R☉ |
| Luminosity | 117 L☉ |
| Surface gravity (log g) | 3.59 cgs |
| Temperature | 9,183±312 K |
| Metallicity [Fe/H] | +0.00±0.05 dex |
| Rotational velocity (v sin i) | 91 km/s |
| Age | 461 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an ordinary A-type main sequence star with a stellar classification of A3 V. It is 461 million years old – about 98% of the way through its main sequence lifetime – and is spinning with a projected rotational velocity of 91 km/s. The star has 2.8 times the mass of the Sun, about 2.2 times the Sun's radius, and is radiating 117 times the Sun's luminosity from its photosphere at an effective temperature of 9183 K.