Psi1 Piscium
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.
| 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 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 | |
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.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.