Gliese 581 System
These are the first three planets of The Gliese 581 solar system: Gliese 581 e, b and c. Gliese 581 e is the fourth planet discovered in the system and the first in order from the star. The planet was discovered by an Observatory of Geneva team led by Michel Mayor, using the HARPS instrument on the European Southern Observatory 3.6 m (140 in) telescope in La Silla, Chile. The discovery was announced on 21 April 2009. Mayor's team employed the radial velocity technique, in which the orbit size and mass of a planet are determined based on the small perturbations it induces in its parent star's orbit via gravity. Gliese 581 b is the first planet of six discovered in the system so far, and the second in order from the star. The planet was discovered by a team of French and Swiss astronomers, who announced their findings on November 30, 2005 as a discovery of one of the smallest extrasolar planets ever found, with one conclusion being that planets may be more common around the sma
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