Omega Piscium
Omega Piscium (Omega Psc, ω Piscium, ω Psc) is a star approximately 106 light years away from Earth, in the constellation Pisces. It has a spectral type of F4IV, meaning it is a subgiant/dwarf star, and it has a temperature of 6,600 kelvins. It may or may not be a close binary star system. Variations in its spectrum were once interpreted as giving it an orbital period of 2.16 days, but this claim was later debunked as false. It is 20 times brighter than the Sun and is 1.8 times greater in mass, if it is a single star.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23h 59m 18.69064s |
| Declination | +06° 51′ 47.9562″ |
| Apparent magnitude (V) | 4.01 |
| Characteristics | |
| Spectral type | F4 IV or F4 V |
| U−B color index | +0.07 |
| B−V color index | +0.42 |
| Astrometry | |
| Radial velocity (Rv) | +2.9±0.3 km/s |
| Proper motion (μ) | RA: +150.35 mas/yr Dec.: −112.12 mas/yr |
| Parallax (π) | 31.26 ± 0.15 mas |
| Distance | 104.3 ± 0.5 ly (32.0 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.51 |
| Details | |
| ω Psc A | |
| Mass | 1.22 M☉ |
| Luminosity | 21 L☉ |
| Surface gravity (log g) | 3.74±0.14 cgs |
| Temperature | 6,641±226 K |
| Metallicity [Fe/H] | −0.09 dex |
| Rotational velocity (v sin i) | 40.3 km/s |
| Age | 1.337 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
It is part of the drawn asterism in classic and modern renderings as the start of the tail, east of the Circlet of Pisces, a near-circle which forms all but the tail (the head and body) of the western (fatter) "fish" in the constellation of two fishes.