Phi Piscium
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Pisces |
| Right ascension | 01h 13m 44.9471s |
| Declination | +24° 35' 01.367" |
| Apparent magnitude (V) | 4.676 (A)/9.11 (B) |
| Characteristics | |
| Spectral type | K0III (A)/K0 (B) |
| U-B color index | +0.84 (A)/+0.25 (B) |
| B-V color index | +1.03 (A)/+0.92 (B) |
| Astrometry | |
| Radial velocity (Rv) | 5.9 km/s |
| Proper motion (μ) | RA: 18.58 mas/yr Dec.: -21.26 mas/yr |
| Parallax (π) | 8.64 ± 0.81 mas |
| Distance | 380 ± 40 ly (120 ± 10 pc) |
| Visual binary orbit[3], p. 160 | |
| Companion | φ Psc B |
| Period (P) | 7473 ± 3 days yr |
| Eccentricity (e) | 0.815 ± 0.005 |
| Argument of periastron (ω) | 71.9 ± 1.7° |
| Other designations | |
Phi Piscium (φ Psc) is a binary star system approximately 380 light years away in the constellation Pisces. It consists of Phi Piscium A, with a spectral type of K0III, and Phi Piscium B.[1] Phi Piscium A possesses a surface temperature of 3,500 to 5,000 kelvins. Some suggest the only visible companion in the Phi Piscium B sub-system is a late F dwarf star, while others suggest it is a K0 star. The invisible component of the Phi Piscium B sub-system is proposed to have a spectral type of M2V.[4] The star system has a period of about 20 1/2 years and has a notably high eccentricity of 0.815.[3]
[edit] References
- ^ a b Simbad Query Result. Simbad. Retrieved on October 1, 2007.
- ^ Simbad Query Result. Simbad. Retrieved on October 1, 2007.
- ^ a b R.F. Griffin, G.H. Herbig (1991). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 99: Phi PISCIUM". The Observatory 111: 155-162.
- ^ R.F. Griffin, G.H. Herbig (1991). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 100: Phi PISCIUM B". The Observatory 111: 201-219.
