Achernar

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.

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Achernar, which is released under the Creative Commons Attribution-Share-Alike License 3.0