Psi1 Piscium
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisecs |
| ψ1 Psc A | |
| Right ascension | 01h 05m 40.95527s |
| Declination | +21° 28′ 23.4489″ |
| Apparent magnitude (V) | 5.273 |
| ψ1 Psc B | |
| Right ascension | 01h 05m 41.71111s |
| Declination | +21° 27′ 55.6120″ |
| Apparent magnitude (V) | 5.455 |
| Characteristics | |
| ψ1 Psc A | |
| Spectral type | A1V + A4V |
| U−B color index | −0.12 |
| B−V color index | −0.04 |
| ψ1 Psc B | |
| Spectral type | A0Vn |
| U−B color index | −0.17 |
| B−V color index | −0.06 |
| Astrometry | |
| ψ1 Psc A | |
| Radial velocity (Rv) | −3.90±2.9 km/s |
| Proper motion (μ) | RA: 44.49 mas/yr Dec.: −14.82 mas/yr |
| Parallax (π) | 11.86±0.68 mas |
| Distance | 280 ± 20 ly (84 ± 5 pc) |
| Absolute magnitude (MV) | +0.71 |
| ψ1 Psc B | |
| Radial velocity (Rv) | −7.20±3.6 km/s |
| Proper motion (μ) | RA: 54.952 mas/yr Dec.: −15.938 mas/yr |
| Parallax (π) | 11.3778 ± 0.0506 mas |
| Distance | 287 ± 1 ly (87.9 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.89 |
| Orbit | |
| Primary | ψ1 Psc Aa |
| Companion | ψ1 Psc Ab |
| Period (P) | 14.44±0.26 yr |
| Semi-major axis (a) | 114.3±1.7″ |
| Eccentricity (e) | 0.519±0.027 |
| Inclination (i) | 77.43±0.81° |
| Longitude of the node (Ω) | 134.8±1.2° |
| Periastron epoch (T) | B 2007.512±0.041 |
| Argument of periastron (ω) (secondary) | 305.4±2.3° |
| Details | |
| ψ1 Psc Aa | |
| Mass | 2.2 M☉ |
| ψ1 Psc Ab | |
| Mass | 1.7 M☉ |
| Details | |
| ψ1 Psc B | |
| Mass | 2.6 M☉ |
| Radius | 2.2 R☉ |
| Luminosity | 57 L☉ |
| Surface gravity (log g) | 4.04 cgs |
| Temperature | 10,694 K |
| Rotational velocity (v sin i) | 250 km/s |
| Age | 210 Myr |
| Other designations | |
| ψ1 Psc, 74 Psc, ADS 899 AB, CCDM J01057+2128 | |
| ψ1 Psc A: BD+20°156, HD 6456, HIP 5131, HR 310, SAO 74482 | |
| ψ1 Psc B: BD+20°157, HD 6457, HIP 5132, HR 311, SAO 74483 | |
| Database references | |
| SIMBAD | ψ1 Psc A |
| ψ1 Psc B | |
Psi1 Piscium (Psi1 Psc, ψ1 Piscium, ψ1 Psc) is a binary star in the constellation Pisces. It is approximately 280 light years from Earth, based on its parallax.
The two components of Psi1 Piscium are both A-type main-sequence stars. The primary has an apparent magnitude of 5.273, while the secondary is slightly dimmer, with an apparent magnitude of 5.455. The primary itself is a close binary, with two A-type stars that orbit each other every 14.44 years.
Psi1 Piscium is moving through the Galaxy at a speed of 22.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,800 and 24,300 light years from the center of the Galaxy.