Alpha Piscium
Alpha Piscium (α Piscium) is a binary star system in the equatorial constellation of Pisces. Based upon parallax measurements made by the Hipparcos spacecraft, it is about 151 light-years from the Solar System.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 02h 02m 02.81972s |
| Declination | +02° 45′ 49.5410″ |
| Apparent magnitude (V) | 3.82 (4.33 + 5.23) |
| Characteristics | |
| Spectral type | kA0hA7 Sr + kA2hF2mF2 (IV) |
| Variable type | α2 CVn |
| Astrometry | |
| Proper motion (μ) | RA: +32.45 mas/yr Dec.: +0.04 mas/yr |
| Parallax (π) | 21.66 ± 1.06 mas |
| Distance | 151 ± 7 ly (46 ± 2 pc) |
| Absolute magnitude (MV) | +0.50 |
| Orbit | |
| Period (P) | 3267.4 yr |
| Semi-major axis (a) | 7.4″ |
| Eccentricity (e) | 0.465 |
| Inclination (i) | 113.4° |
| Longitude of the node (Ω) | 3.70° |
| Periastron epoch (T) | 2188.6 |
| Argument of periastron (ω) (secondary) | 147.9° |
| Details | |
| α Psc A | |
| Mass | 2.55±0.11 M☉ |
| Radius | 2.45 R☉ |
| Luminosity | 55+14 −11 L☉ |
| Surface gravity (log g) | 3.85 cgs |
| Temperature | 10,233+507 −483 K |
| Rotational velocity (v sin i) | 81 km/s |
| α Psc B | |
| Mass | 2.64+0.21 −0.28 M☉ |
| Radius | 2.66±0.45 R☉ |
| Luminosity | 63+13 −11 L☉ |
| Surface gravity (log g) | 4.01±0.14 cgs |
| Temperature | 10,000±710 K |
| Rotational velocity (v sin i) | 84 km/s |
| Age | 331+159 −153 Myr |
| Other designations | |
| α Psc A: HD 12447, HR 596 | |
| α Psc B: HD 12446, HR 595 | |
| Database references | |
| SIMBAD | α Psc |
| α Psc A | |
| α Psc B | |
The two components are designated Alpha Piscium A (officially named Alrescha /ælˈriːʃə/, the traditional name of the system) and B.
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