| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 37m 05.67915s[1] |
| Declination | −40° 16′ 28,7408″[1] |
| Apparent magnitude (V) | 4.57[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| B−Vcolor index | 1.023±0.028[2] |
| Astrometry | |
| Radial velocity (Rv) | +11.50±0.02[4] km/s |
| Proper motion (μ) | RA: −13.342mas/yr Dec.: −12.219mas/yr |
| Parallax (π) | 14.1588±0.3283 mas[1] |
| Distance | 230 ± 5 ly (71 ± 2 pc) |
| Absolute magnitude (MV) | +0.32[2] |
| Details[4] | |
| Mass | 1.43±0.25 M☉ |
| Radius | 13.01±0.54 R☉ |
| Luminosity | 95.5+16.7 −14.2 L☉ |
| Surface gravity (log g) | 2.75±0.01 cgs |
| Temperature | 4,660±21 K |
| Metallicity [Fe/H] | −0.15±0.05 dex |
| Rotational velocity (v sin i) | 1.40±0.55 km/s |
| Age | 2.58±1.22 Gyr |
| Other designations | |
| y Eri,CD−40° 1008,FK5 130,HD 22663,HIP 16870,HR 1106,SAO 216405[5] | |
| Database references | |
| SIMBAD | data |
HD 22663 (y Eridani) is a candidateastrometric binary[6]star system in the equatorialconstellation ofEridanus. It is visible to the naked eye with anapparent visual magnitude of 4.57.[2] Based upon an annualparallax shift of14.2 mas,[1] it is located around 230 light years from theSun. It is moving further away from the Earth with a heliocentricradial velocity of +11.5 km/s,[4] having come within 140.9 ly some 3.76 million years ago.[2]
The visible component is an orange-huedgiant star with astellar classification of K1 III,[3] having exhausted the hydrogen at its core andevolved away from themain sequence. It has an estimated 1.4 times themass of the Sun and has expanded to 13 times theSun's radius. At the age of 2.6 billion years, this star is radiating 96 times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,660 K.[4]
