Delta Eridani

Delta Eridani, which is Latinized from δ Eridani, is a star in the equatorial constellation of Eridanus.

δ Eridani
Location of δ Eridani (circled)
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
Distance29.49 ± 0.08 ly
(9.04 ± 0.02 pc)
Absolute magnitude (MV)3.77
Details
Mass1.33±0.07 M
Radius2.327±0.029 R
Luminosity3.00±0.12 L
Surface gravity (log g)3.77±0.08 cgs
Temperature4,986±57 K
Metallicity [Fe/H]+0.15±0.07 dex
Rotational velocity (v sin i)0.7±0.6 km/s
Age6.194 Gyr
Other designations
Rana, δ Eridani, 23 Eridani, del Eri, NSV 1246, BD−10°728, GJ 150, HD 23249, HIP 17378, HR 1136, SAO 130686, LHS 1581
Database references
SIMBADdata

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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