Eta Eridani
Star in the constellation Eridanus / From Wikipedia, the free encyclopedia
Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), officially named Azha (with a silent 'h', possibly /ˈeɪzə/),[8][7] 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.
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Eridanus |
Right ascension | 02h 56m 25.64948s[1] |
Declination | −08° 53′ 53.3221″[1] |
Apparent magnitude (V) | +3.87[2] |
Characteristics | |
Spectral type | K1+ IIIb[3] |
U−B color index | _0.98[2] |
B−V color index | +1.12[2] |
Variable type | suspected[4] |
Astrometry | |
Radial velocity (Rv) | −20.32 km/s |
Proper motion (μ) | RA: +77.36 ± 0.19[1] mas/yr Dec.: −220.16 ± 0.20[1] mas/yr |
Parallax (π) | 23.89 ± 0.19 mas[1] |
Distance | 137 ± 1 ly (41.9 ± 0.3 pc) |
Absolute magnitude (MV) | +0.83[5] |
Details | |
Mass | 1.43[6] M☉ |
Radius | 10.48[6] R☉ |
Luminosity | 57.5[6] L☉ |
Surface gravity (log g) | +2.79[6] cgs |
Temperature | 4,742[6] K |
Rotational velocity (v sin i) | 2.34[6] km/s |
Age | 2.66[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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