Delta Eridani
Delta Eridani, which is Latinized from δ Eridani, is a star in the equatorial constellation of Eridanus.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Eridanus |
Right ascension | 03h 43m 14.90088s |
Declination | –09° 45′ 48.2084″ |
Apparent magnitude (V) | 3.51 - 3.56 |
Characteristics | |
Evolutionary stage | Subgiant |
Spectral type | K0 IV |
U−B color index | +0.69 |
B−V color index | +0.92 |
Variable type | Suspected RS CVn |
Astrometry | |
Radial velocity (Rv) | −6.28±0.09 km/s |
Proper motion (μ) | RA: −93.16 mas/yr Dec.: +743.64 mas/yr |
Parallax (π) | 110.61 ± 0.29 mas |
Distance | 29.49 ± 0.08 ly (9.04 ± 0.02 pc) |
Absolute magnitude (MV) | 3.77 |
Details | |
Mass | 1.33±0.07 M☉ |
Radius | 2.327±0.029 R☉ |
Luminosity | 3.00±0.12 L☉ |
Surface gravity (log g) | 3.77±0.08 cgs |
Temperature | 4,986±57 K |
Metallicity [Fe/H] | +0.15±0.07 dex |
Rotational velocity (v sin i) | 0.7±0.6 km/s |
Age | 6.194 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
The star is visible to the naked eye and has been observed to vary slightly in brightness between magnitudes 3.51 and 3.56, although subsequent observations did not bear this out. It is relatively near to the Sun, with a distance of about 29.5 light years as determined from parallax. The star is drifting closer with a radial velocity of −6 km/s.
Delta Eridani is sometimes called Rana: Rana means "the frog" in Latin, but derivation of this name is uncertain. The name was approved by the International Astronomic Union on 4 April 2022.
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