Gamma Eridani
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 58m 01.76695s |
| Declination | −13° 30′ 30.6698″ |
| Apparent magnitude (V) | 2.91(2.88 - 2.96) |
| Characteristics | |
| Spectral type | M0III-IIIb |
| U−B color index | +1.96 |
| B−V color index | +1.58 |
| Variable type | Lb? |
| Astrometry | |
| Radial velocity (Rv) | 60.81±0.25 km/s |
| Proper motion (μ) |
RA: +61.57 mas/yr Dec.: −113.11 mas/yr |
| Parallax (π) | 16.04 ± 0.58mas |
| Distance | 203 ± 7 ly (62 ± 2 pc) |
| Details | |
| Radius | 80 R☉ |
| Luminosity | 1,259 L☉ |
| Surface gravity (log g) | 1.0 cgs |
| Temperature | 3,811 K |
| Rotational velocity (v sin i) | 3.8 km/s |
| Other designations | |
|
Zaurac, Gamma Eridani, Gamma Eri, γ Eridani, γ Eri, 34 Eridani, 34 Eri, HD 25025, HIP 18543, HR 1231.
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| Database references | |
| SIMBAD | data |
Gamma Eridani (γ Eridani, abbreviated Gamma Eri, γ Eri), also named Zaurak, is a star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude of 2.91 and lies at a distance of about 203 light years from the Sun, as determined by the Hipparcos astrometry satellite. This is an evolved red giant star that is currently on the asymptotic giant branch of the Hertzsprung–Russell diagram. It is a slow irregular variable with a peak magnitude of 2.88.
Gamma Eridani is the star's Bayer designation. It has the traditional name Zaurak, alternatively spelled Zaurac, which is Arabic for 'boat'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included Zaurak for this star.
In Chinese, 天苑 (Tiān Yuàn), meaning Celestial Meadows, refers to an asterism consisting of γ Eridani, δ 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, γ Eridani itself is known as 天苑一 (Tiān Yuàn yī, English: the First [Star] of Celestial Meadows.)
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