51 Eridani
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 37m 36.13234s |
| Declination | −02° 28′ 24.7749″ |
| Apparent magnitude (V) | 5.22 |
| Characteristics | |
| Spectral type | F0 V |
| Variable type | γ Dor |
| Astrometry | |
| Radial velocity (Rv) | 12.60±0.3 km/s |
| Proper motion (μ) | RA: 44.22 ± 0.34 mas/yr Dec.: –64.39 ± 0.27 mas/yr |
| Parallax (π) | 33.98±0.34 mas |
| Distance | 96.0 ± 1.0 ly (29.4 ± 0.3 pc) |
| Absolute magnitude (MV) | 2.87 |
| Details | |
| 51 Eri A | |
| Mass | 1.550+0.006 −0.005 M☉ |
| Radius | 1.45±0.02 R☉ |
| Luminosity | 5.72±0.096 L☉ |
| Surface gravity (log g) | 3.95±0.04 cgs |
| Temperature | 7,422±58 K |
| Metallicity [Fe/H] | −0.12±0.06 dex |
| Rotational velocity (v sin i) | 77.9 km/s |
| Age | 23.2+1.7 −2.0 Myr |
| Other designations | |
| c Eridani, 51 Eridani, BD−02°963, HD 29391, HIP 21547, HR 1474, SAO 131358, 2MASS J04373613-0228248 | |
| Database references | |
| SIMBAD | data |
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51 Eridani is a star in the constellation Eridanus. It has an apparent magnitude of 5.22, meaning it is just visible to the unaided eye in suburban and rural skies. The primary star's absolute magnitude is 2.87. There is also a binary star named GJ 3305 which shares the same proper motion through space with it, making it overall a triple star system.