Theta Piscium

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Theta Piscium[1]
Diagram showing star positions and boundaries of the Pisces constellation and its surroundings
Cercle rouge 100%.svg

Location of θ Piscium(circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 23h 27m 58.0951s
Declination +6° 22′ 44.372″
Apparent magnitude (V) 4.27[2]
Spectral type K1 III[2]
U−B color index +1.00
B−V color index +1.062[2]
Radial velocity (Rv) +6.05 ± 0.19[2] km/s
Proper motion (μ) RA: -123.83 mas/yr
Dec.: -43.26 mas/yr
Parallax (π) 20.54 ± 0.80 mas
Distance 159 ± 6 ly
(49 ± 2 pc)
Mass 1.54[2] M
Other designations
θ Piscium, θ Psc, Theta Psc, 10 Piscium, BD+05° 5173, FK5 1614, GC 32647, HD 220954, HIP 115830, HR 8916, PPM 174110, SAO 128196.
Database references

Theta Piscium (Theta Psc, θ Piscium, θ Psc) is a star approximately 159 light years away from Earth in the constellation Pisces. It is an orange-red star of the spectral type K1III, meaning it is a normal giant star with a surface temperature of 3,500 to 5,000 kelvins, and is brighter yet cooler than the Sun.[3]


In Chinese, 霹靂 (Pī Lì), meaning Thunderbolt, refers to an asterism consisting of refers to an asterism consisting of θ Piscium, β Piscium, γ Piscium, ι Piscium and ω Piscium. Consequently, θ Piscium itself is known as 霹靂三 (Pī Lì sān, English: the Third Star of Thunderbolt.)[4]


  1. ^ "Simbad Query Result". Simbad. Retrieved September 27, 2007. 
  2. ^ a b c d e Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv:astro-ph/0604502Freely accessible, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946 
  3. ^ ""Hipparcos Star Catalog Entry"". Retrieved September 27, 2007. 
  4. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 8 日