Delta Eridani
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 43m 14.90s |
| Declination | –09° 45′ 48.2″ |
| Apparent magnitude (V) | 3.54 |
| Characteristics | |
| Spectral type | K0 IV |
| U−B color index | +0.69 |
| B−V color index | +0.92 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | –6.28 ± 0.09 km/s |
| Proper motion (μ) |
RA: –93.16 ± 0.29 mas/yr Dec.: +743.64 ± 0.22 mas/yr |
| Parallax (π) | 110.61 ± 0.29mas |
| 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) | 3.9 cgs |
| Temperature | 5,055 K |
| Metallicity [Fe/H] | 0.13 dex |
| Rotational velocity (v sin i) | 1.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Eridani (δ Eri, δ Eridani) is a 3.54 magnitude star in the constellation of Eridanus. It is also called Rana. The name Rana means "the frog" in Latin. Rana was referenced as a guide star in "Sky Captain and the World of Tomorrow"
In Chinese, 天苑 (Tiān Yuàn), meaning Celestial Meadows, refers to an asterism consisting of δ Eridani, γ Eridani, π Eridani, ε Eridani, ζ Eridani, η Eridani, π Ceti, τ1 Eridani, τ2 Eridani, τ3 Eridani, τ4 Eridani, τ5 Eridani, τ6 Eridani, τ7 Eridani, τ8 Eridani and τ9 Eridani. Consequently, δ Eridani itself is known as 天苑三 (Tiān Yuàn sān, English: the Third Star of Celestial Meadows.)
This star is relatively near to the Sun, at a measured distance of about 29 light years. It is sometime listed as a RS Canum Venaticorum-type variable star, but this is likely to be an error. (It is currently a suspected variable.) Rana is a sub-giant star that is near the end of its hydrogen-burning cycle and is now consuming helium. This has caused the star to expand and become hotter than a comparable main sequence star. As a sub-giant star it is subject to pulsations in its atmosphere.
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