Iota Piscium

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

Location of ι Piscium(circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 23h 39m 57.04s[2]
Declination +05° 37′ 34.6″[2]
Apparent magnitude (V) 4.13
Spectral type F7 V
U−B color index +0.01
B−V color index +0.50
Radial velocity (Rv) +5.0 km/s
Proper motion (μ) RA: 377.15 ± 0.19[2] mas/yr
Dec.: -437.43 ± 0.15[2] mas/yr
Parallax (π) 72.92 ± 0.15[2] mas
Distance 44.73 ± 0.09 ly
(13.71 ± 0.03 pc)
Absolute magnitude (MV) 3.43
Radius 1.595 ± 0.014[3] R
Luminosity 3.555 ± 0.058[3] L
Temperature 6,288 ± 37[3] K
Other designations
ι Piscium, ι Psc,Iota Psc, 17 Piscium, BD+04°5035, CCDM J23399+0538A, FK5 892, GC 32879, HD 222368, HIP 116771, HR 8969, IDS 23348+0505 A, PPM 174312, SAO 128310, WDS J23399+0538A

Iota Piscium (Iota Psc, ι Piscium, ι Psc) is an F-type main-sequence star 45 light years from Earth,[2] in the constellation Pisces. Its spectral type is F7V, which means that it is somewhat larger and brighter than the Sun, but still within the range considered to have the potential for Earth-like planets. It has a surface temperature of about 6,000 to 7,500 K. Iota Piscium is a suspected to be a variable star, and was once thought to have one or two stellar companions, but both are line-of-sight coincidences.[4]


In Chinese, 霹靂 (Pī Lì), meaning Thunderbolt, refers to an asterism consisting of refers to an asterism consisting of ι Piscium, β Piscium, γ Piscium, θ Piscium, and ω Piscium. Consequently, ι Piscium itself is known as 霹靂四 (Pī Lì sì, English: the Fourth Star of Thunderbolt.)[5]


  1. ^ "Simbad Query Result". Simbad Astronomical Object Database. Retrieved April 4, 2007. 
  2. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  3. ^ a b c Boyajian, Tabetha S. et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal 746 (1): 101, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101 . See Table 10.
  4. ^ Kaler, James B., "Iota Piscium", Stars (University of Illinois), retrieved September 27, 2007 
  5. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 8 日