Eta Eridani
Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), officially named Azha (with a silent 'h', possibly /ˈeɪzə/), is a giant star in the constellation of Eridanus. Based on parallax measurements taken during the Hipparcos mission, it is approximately 137 light-years from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 02h 56m 25.64948s |
| Declination | −08° 53′ 53.3221″ |
| Apparent magnitude (V) | +3.87 |
| Characteristics | |
| Spectral type | K1+ IIIb |
| U−B color index | _0.98 |
| B−V color index | +1.12 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | −20.32 km/s |
| Proper motion (μ) | RA: +77.36 ± 0.19 mas/yr Dec.: −220.16 ± 0.20 mas/yr |
| Parallax (π) | 23.89 ± 0.19 mas |
| Distance | 137 ± 1 ly (41.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.83 |
| Details | |
| Mass | 1.43 M☉ |
| Radius | 10.48 R☉ |
| Luminosity | 57.5 L☉ |
| Surface gravity (log g) | +2.79 cgs |
| Temperature | 4,742 K |
| Rotational velocity (v sin i) | 2.34 km/s |
| Age | 2.66 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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