Psi2 Piscium
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 07m 57.16387s |
| Declination | +20° 44′ 20.8310″ |
| Apparent magnitude (V) | +5.56 |
| Characteristics | |
| Spectral type | A3 V |
| B−V color index | +0.12 |
| Astrometry | |
| Radial velocity (Rv) | −15.2±0.9 km/s |
| Proper motion (μ) | RA: +86.72 mas/yr Dec.: −82.75 mas/yr |
| Parallax (π) | 21.14±0.77 mas |
| Distance | 154 ± 6 ly (47 ± 2 pc) |
| Absolute magnitude (MV) | +2.19 |
| Details | |
| Mass | 1.82 M☉ |
| Radius | 2.0 R☉ |
| Luminosity | 13 L☉ |
| Surface gravity (log g) | 4.36±0.14 cgs |
| Temperature | 8,611±293 K |
| Rotational velocity (v sin i) | 149 km/s |
| Age | 250 Myr |
| Other designations | |
| ψ2 Psc, 79 Piscium, BD+19°185, HD 6695, HIP 5310, HR 328, SAO 74506 | |
| Database references | |
| SIMBAD | data |
Psi2 Piscium (ψ2 Piscium) is a white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.56. Based upon an annual parallax shift of 8.66 mas as seen from Earth, it is located about 380 light years from the Sun. It has a peculiar velocity of 14.6±2.9 km/s, indicating it is a runaway star.
This is a suspected binary star system, with a companion star at an angular separation of 0.357±0.002 arc seconds along a position angle of 174.99°±0.30° from the primary, as of 2008. This corresponds to a projected separation of 16.88±0.62 AU. The brighter component is an A-type main sequence star with a stellar classification of A3 V. The system is a source of X-ray emission with a luminosity of 143.9×1020 W, which is most likely originating from the cooler companion since A-type main sequence stars are not expected to be magnetically active.