| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h31m 52.66831s[1] |
| Declination | −00° 02′ 38.4407″[1] |
| Apparent magnitude (V) | 4.91[2] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K0/1 III[3] |
| U−B color index | +1.41[4] |
| B−V color index | +1.32±0.04[2] |
| Astrometry | |
| Radial velocity (Rv) | +15.22±0.35[1] km/s |
| Proper motion (μ) | RA: −1.149[1] mas/yr Dec.: −7.655[1] mas/yr |
| Parallax (π) | 4.6579 ± 0.2082 mas[1] |
| Distance | 700 ± 30 ly (215 ± 10 pc) |
| Absolute magnitude (MV) | −1.59[2] |
| Details | |
| Radius | 50.06±1.73[1] R☉ |
| Luminosity | 787.9±40.1[1] L☉ |
| Surface gravity (log g) | 2.0[5] cgs |
| Temperature | 4322+58 −57[1] K |
| Metallicity [Fe/H] | −0.17[5] dex |
| Other designations | |
45 Eri, BD−00°713, GC 5528, HD 28749, HIP 21139, HR 1437, SAO 131270[6] | |
| Database references | |
| SIMBAD | data |
45 Eridani is a single[7] star located around 700 light years away from the Sun in the equatorial constellationofEridanus. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.91.[2] This body is moving away from the Earth with a heliocentric radial velocity of +15 km/s.[1]
The stellar classification for this star is K0/1 III,[3] which indicates this is an aging K-type giant star that has exhausted the hydrogen supply at its core and expanded. It has reached 50[1] times the Sun's radius and is radiating 788[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,322 K.[1]
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