Iota Piscium

Iota Piscium (Iota Psc, ι Piscium, ι Psc) is a star located in the constellation Pisces. With an apparent magnitude of +4.13, it is visible to the naked eye. Parallax measurements give a distance of 44.73 light-years.

Iota Piscium^[1]

Location of ι Piscium(circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Pisces
Right ascension	23h 39m 57.04138s[2]
Declination	+05° 37′ 34.6475″[2]
Apparent magnitude (V)	4.13[3]
Characteristics
Evolutionary stage	Main sequence
Spectral type	F7 V[3]
U−B color index	−0.01[4]
B−V color index	+0.50[4]
Astrometry
Radial velocity (Rv)	+5.4[5] 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 mas[2]
Distance	44.73 ± 0.09 ly (13.71 ± 0.03 pc)
Absolute magnitude (MV)	3.43[6]
Details
Mass	1.15+0.14 −0.04[7] M☉
Radius	1.595±0.014[8] R☉
Luminosity	3.555±0.058[8] L☉
Surface gravity (log g)	4.11[9] cgs
Temperature	6,288±37[8] K
Metallicity [Fe/H]	−0.12[9] dex
Rotational velocity (v sin i)	6.67[10] km/s
Age	5.19+0.80 −2.15[7] Gyr
Other designations
ι Psc, 17 Psc, BD+04°5035, FK5 892, GC 32879, GJ 904, HD 222368, HIP 116771, HR 8969, SAO 128310, PPM 174312, CCDM J23399+0538A, WDS J23399+0538A, IDS 23348+0505 A[1]
Database references
SIMBAD	data

Its spectral type is F7V,^[3] with the luminosity class V suggesting it is in the main sequence, fusing atoms of hydrogen into helium. The star has 1.15 times the Sun's mass and 1.60 times the Sun's radius. It is radiating 3.6 times the Sun's luminosity at an effective temperature of 6,288 K.^[8] It is a suspected variable star.^[11]

The star was once thought to have one or two stellar companions, but both are line-of-sight coincidences.^[11] It displays a far-infrared excess at a wavelength of 70μm, suggesting it is being orbited by a cold debris disk.^[12]

Naming

In Chinese, 霹靂 (Pī Lì), meaning Thunderbolt, refers to an asterism consisting of ι Piscium, β Piscium, γ Piscium, θ Piscium, and ω Piscium. Consequently, the Chinese name for ι Piscium itself is 霹靂四 (Pī Lì sì, English: the Fourth Star of Thunderbolt.)^[13]