  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 02h 40m 40.03501s[1] |
| Declination | −39° 51′ 19.3541″[1] |
| Apparent magnitude (V) | 4.11[2] |
| Characteristics | |
| Evolutionary stage | Red clump[3] |
| Spectral type | K0 III[4] |
| U−Bcolor index | +0.74[2] |
| B−Vcolor index | +1.02[2] |
| Astrometry | |
| Radial velocity (Rv) | −9.30±0.70[5] km/s |
| Proper motion (μ) | RA: +135.92[1]mas/yr Dec.: −27.53[1]mas/yr |
| Parallax (π) | 21.65±0.18 mas[1] |
| Distance | 151 ± 1 ly (46.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.877[3] |
| Details[6] | |
| Mass | 1.29±0.01 M☉ |
| Radius | 11.17±0.06 R☉ |
| Luminosity | 54.7±0.5 L☉ |
| Surface gravity (log g) | 2.65±0.10 cgs |
| Temperature | 4,700±30 K |
| Metallicity[Fe/H] | −0.34±0.02 dex |
| Age | 3.55±0.12 Gyr |
| Other designations | |
| ι Eri,CD−40°689,FK5 1075,HD 16815,HIP 12486,HR 794,SAO 215999[7] | |
| Database references | |
| SIMBAD | data |
Iota Eridani (ι Eri) is a solitarystar in theconstellationEridanus. It is visible to the naked eye with anapparent magnitude of 4.11.[2] With an annualparallax shift of 0.02165 arcseconds,[1] it lies at an estimated distance of about 151 light years.
This is anevolvedgiant star with astellar classification of K0 III.[4] The measuredangular diameter, after correcting forlimb darkening, is2.248±0.014 mas. This star is 3.55 billion years old, sufficient to have exhausted the hydrogen at its core and reached ared clump stage. It is only around 29% more massive than the Sun, but is eleven times larger. It radiates 54.7 times thesolar luminosity from itsouter atmosphere at aneffective temperature of 4,700 K.[6]
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