Iota Piscium
F-type main sequence star in the constellation Pisces
From Wikipedia, the free encyclopedia
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.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23h 39m 57.04138s[1] |
| Declination | +05° 37â² 34.6475â³[1] |
| Apparent magnitude (V) | 4.13[2] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | F7 V[2] |
| UâB color index | â0.01[4] |
| BâV color index | +0.50[4] |
| Astrometry | |
| Radial velocity (Rv) | +5.4[5] km/s |
| Proper motion (μ) | RA: 377.15±0.19[1] mas/yr Dec.: â437.43±0.15[1] mas/yr |
| Parallax (Ï) | 72.92±0.15 mas[1] |
| Distance | 44.73 ± 0.09 ly (13.71 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.43[6] |
| Details | |
| Mass | 1.15+0.14 â0.04[7] Mâ |
| Radius | 1.595±0.014[8] Râ |
| Luminosity | 3.555±0.058[8] Lâ |
| Surface gravity (log g) | 4.11[9] cgs |
| Temperature | 6,288±37[8] K |
| Metallicity [Fe/H] | â0.12[9] dex |
| Rotation | 9 days[10] |
| Rotational velocity (v sin i) | 6.67[11] km/s |
| Age | 5.19+0.80 â2.15[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[12] | |
| Database references | |
| SIMBAD | data |
Its spectral type is F7V,[2] 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.[13]
The star was once thought to have one or two stellar companions, but both are line-of-sight coincidences.[13] However, it has a candidate proper motion companion with a separation of 8.48".[14] It displays a far-infrared excess at a wavelength of 70μm, suggesting it is being orbited by a cold debris disk.[15]
Naming
In Chinese, é¹é (PÄ« Lì), meaning Thunderbolt, refers to an asterism consisting of ι Piscium, β Piscium, γ Piscium, θ Piscium, and Ï Piscium. Consequently, the Chinese name for ι Piscium itself is é¹éå (PÄ« Lì sì, English: the Fourth Star of Thunderbolt.)[16]