![]() The position of Achernar (lower right). |
|
Observation data Epoch J2000 Equinox J2000 |
|
---|---|
Constellation | Eridanus |
Right ascension | 01 |
Declination | –57° 14′ 12.3101″ |
Apparent magnitude (V) | 0.445 |
Characteristics | |
Spectral type | B6 Vep |
U−B color index | −0.64 |
B−V color index | −0.17 |
Variable type | Lambda Eridani |
Astrometry | |
Radial velocity (Rv) | +16 km/s |
Proper motion (μ) | RA: 87.00 ± 0.58 mas/yr |
Parallax (π) | 23.39 ± 0.57mas |
Distance | 139 ± 3 ly (43 ± 1 pc) |
Details | |
Mass | 6–8M☉ |
Radius | 7.3 × 11.4R☉ |
Luminosity | 3,150L☉ |
Surface gravity (log g) | 3.5 |
Temperature | ~15,000K |
Rotational velocity (v sin i) | 250 km/s |
Age | 1–5 × 108 years |
Other designations | |
α Eri, HR 472, CD -57°334, HD 10144, SAO 232481, FK5 54, HIP 7588, 水委一.
|