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Gamma Eridani
Variable star in the constellation Eridanus / From Wikipedia, the free encyclopedia
Gamma Eridani (γ Eridani, abbreviated Gamma Eri, γ Eri), formally named Zaurak /ˈzɔːræk/,[12][13] is a variable star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude that varies around 2.9, and lies at a distance of about 203 light years from the Sun, as determined by the Hipparcos astrometry satellite.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Eridanus |
Right ascension | 03h 58m 01.76695s[1] |
Declination | −13° 30′ 30.6698″[1] |
Apparent magnitude (V) | 2.88 - 2.96[2] |
Characteristics | |
Evolutionary stage | AGB[3] |
Spectral type | M0III-IIIb[4] |
U−B color index | +1.96[5] |
B−V color index | +1.58[5] |
Variable type | Lb?[2] |
Astrometry | |
Radial velocity (Rv) | 60.81±0.25[6] km/s |
Proper motion (μ) | RA: +61.57[1] mas/yr Dec.: −113.11[1] mas/yr |
Parallax (π) | 17.0016 ± 0.2254 mas[7] |
Distance | 192 ± 3 ly (58.8 ± 0.8 pc) |
Absolute magnitude (MV) | −1.19[8] |
Details | |
Mass | 1.55[9] M☉ |
Radius | 58.7±0.8[10] R☉ |
Luminosity | 566[9] L☉ |
Surface gravity (log g) | 1.18[9] cgs |
Temperature | 3,875±129[9] K |
Rotational velocity (v sin i) | 3.8[6] km/s |
Other designations | |
Zaurac, Gamma Eridani, Gamma Eri, γ Eridani, γ Eri, 34 Eridani, 34 Eri, HD 25025, HIP 18543, HR 1231[11] | |
Database references | |
SIMBAD | data |
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