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Gliese 832 c
Gliese 832 c (also known as Gl 832 c or GJ 832 c) is an extrasolar planet located approximately 16 light-years away in the constellation of Grus, orbiting the star Gliese 832, a red dwarf.〔 The planet has an Earth Similarity Index of 0.81, one of the highest Earth Similarity Indices for any known extrasolar planet. It is in its star's habitable zone.
To date, it is the second closest known potentially habitable exoplanet to Earth.〔 The closest potentially habitable exoplanet is Kapteyn b, at 13 light years distant.
==Description==
Gliese 832 c has a mass of approximately 5.4 times that of Earth. Its temperature is predicted to be relatively similar to Earth's, but is subject to significant swings as it orbits its star. The planet has a relatively high eccentricity, taking it very near to the predicted inner edge of the habitable zone. It has an orbital period of approximately 36 days.〔 The planet's average equilibrium temperature is predicted to be ,〔 but is estimated to vary from at apoastron to at periastron.〔Venus, greatly reducing the chance for life.
The planet is a super-Earth mass planet orbiting in its star's habitable zone. Although it orbits its star much closer than the Earth orbits the Sun, it orbits a red dwarf, receiving approximately as much energy from it as the Earth does from its star. It is not known whether Gliese 832 c transits its host star, something which would be required in order to detect any atmosphere the planet may have and determine its composition.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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