Azha
 Location of η Eridani (circled) |
|
| 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 ± 0.19mas |
| 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 |
Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), also named Azha, is a giant star in the constellation of Eridanus. It is 137 light years from the Sun.
η Eridani (Latinised to Eta Eridani) is the star's Bayer designation.
It bore the traditional name Azha ("the breeding place"), a corruption of the Persian آشيانه āšiyāne "the (ostrich) nest"". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Azha for this star on 12 September 2016 and it is now so entered in the IAU Catalog of Star Names.
In Chinese, 天苑 (Tiān Yuàn), meaning Celestial Meadows, refers to an asterism consisting of Eta Eridani, Gamma Eridani, Pi Eridani, Delta Eridani, Epsilon Eridani, Zeta Eridani, Pi Ceti, Tau1 Eridani, Tau2 Eridani, Tau3 Eridani, Tau4 Eridani, Tau5 Eridani, Tau6 Eridani, Tau7 Eridani, Tau8 Eridani and Tau9 Eridani. Consequently, Eta Eridani itself is known as 天苑六 (Tiān Yuàn liù, English: the Sixth Star of Celestial Meadows.)
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