Английская Википедия:Gliese 581e

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Шаблон:Short description Шаблон:Infobox planet Gliese 581e Шаблон:IPAc-en or Gl 581e is an exoplanet orbiting within the Gliese 581 system, located approximately 20.4 light-years away from Earth in the Libra constellation. It is the third planet discovered in the system (fourth if the disputed planet candidate Gliese 581d is included) 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 Шаблон:Convert 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.

At a minimum mass of 1.7 Earth masses, it is relatively close in mass to Earth. At an orbital distance of just Шаблон:Convert from its parent star, however, it orbits further in than the habitable zone. It is unlikely to possess an atmosphere due to its high temperature and strong radiation from the star. Although scientists think it probably has a rocky surface similar to Earth, it is also likely to experience intense tidal heating similar to (and likely more intense than) that affecting Jupiter's moon Io. Gliese 581e completes an orbit around its parent star in approximately 3.15 days.

See also

• Habitability of red dwarf systems

External links

• Lightest exoplanet yet discovered European Southern Observatory press release
• Scientists discover a nearly Earth-sized planet
• Publications at Exoplanet.eu Шаблон:Webarchive