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Psi2 Piscium
Binary star system in the constellation Pisces / From Wikipedia, the free encyclopedia
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.[2] Based upon an annual parallax shift of 8.66 mas as seen from Earth,[1] 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.[9]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Pisces |
Right ascension | 01h 07m 57.16387s[1] |
Declination | +20° 44′ 20.8310″[1] |
Apparent magnitude (V) | +5.56[2] |
Characteristics | |
Spectral type | A3 V[3] |
B−V color index | +0.12[2] |
Astrometry | |
Radial velocity (Rv) | −15.2±0.9[4] km/s |
Proper motion (μ) | RA: +86.72[1] mas/yr Dec.: −82.75[1] mas/yr |
Parallax (π) | 21.14 ± 0.77 mas[1] |
Distance | 154 ± 6 ly (47 ± 2 pc) |
Absolute magnitude (MV) | +2.19[5] |
Details | |
Mass | 1.82[6] M☉ |
Radius | 2.0[7] R☉ |
Luminosity | 13[3] L☉ |
Surface gravity (log g) | 4.36±0.14[6] cgs |
Temperature | 8,611±293[6] K |
Rotational velocity (v sin i) | 149[3] km/s |
Age | 250[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is a suspected binary star system,[10] 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.[11] The brighter component is an A-type main sequence star with a stellar classification of A3 V.[3] 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.[12]