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Phi Piscium A/B[1][2]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 01h 13m 44.9471s
Declination +24° 35' 01.367"
Apparent magnitude (V) 4.676 (A)/9.11 (B)
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)
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)
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, 85 Piscium, HR 360, BD+23°158, HD 7318, SAO 74571, HIP 5742, GC 1474

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]


  1. ^ a b "Simbad Query Result". Simbad.*+85+Psc&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. Retrieved October 1, 2007.  
  2. ^ "Simbad Query Result". Simbad. Retrieved October 1, 2007.  
  3. ^ 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.  
  4. ^ R.F. Griffin, G.H. Herbig (1991). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 100: Phi PISCIUM B". The Observatory 111: 201–219.  


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