Delta Eridani
Star in the constellation Eridanus / From Wikipedia, the free encyclopedia
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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[1] |
Declination | –09° 45′ 48.2084″[1] |
Apparent magnitude (V) | 3.51 - 3.56[2] |
Characteristics | |
Evolutionary stage | Subgiant |
Spectral type | K0 IV[3] |
U−B color index | +0.69[4] |
B−V color index | +0.92[4] |
Variable type | Suspected RS CVn[2] |
Astrometry | |
Radial velocity (Rv) | −6.28±0.09[5] km/s |
Proper motion (μ) | RA: −93.16[1] mas/yr Dec.: +743.64[1] mas/yr |
Parallax (π) | 110.61 ± 0.29 mas[1] |
Distance | 29.49 ± 0.08 ly (9.04 ± 0.02 pc) |
Absolute magnitude (MV) | 3.77[6] |
Details[7] | |
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[8] 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,[2] although subsequent observations did not bear this out.[10] It is relatively near to the Sun, with a distance of about 29.5 light years as determined from parallax.[1] The star is drifting closer with a radial velocity of −6 km/s.[5]
Delta Eridani is sometimes called Rana:[11] 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.[12]