Alpha Centauri Bb is an extrasolar planet orbiting the K-type star Alpha Centauri B approximately 4.37 lightyears away in the southern constellation of Centaurus.On 16 October 2012, a team of European astronomers announced that an Earth-mass planet was detected in orbit around Alpha Centauri B using theradial velocity technique with HARPS at La Silla Observatory, Chile.Over three years of observations were needed for the difficult analysis. The planet is not in the habitable zone, orbiting very close to the host star at just 0.04 AU and completing one orbit every 3.236 days.Subject to uncertainties in Alpha Centauri Bb'salbedo and the likely thickness of its atmosphere, its surface temperature is at least 1500 K, far too hot for liquid water and also above the melting temperatures of many silicate magmas. For comparison, the surface temperature of Venus, the hottest in the solar system, is 735 K.
资料来源:英文维基百科