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The exoplanet known as GJ 667C c is part of a multiplanet system (the exact number is ambiguous - see reference below), and falls into the class of a super-Earth.
The star GJ 667C is actually a member of a triple-star system. The star GJ 667C is about 22.3 light years from Earth, its mass is about a thrid that of our Sun, and its size is about the same as our Sun. The planet itself has a mass lower limit of about 4.26 Earth masses, and a maximum star-planet distance (semimajor axis) of just 12% of the Earth-Sun distance (0.1251 astronomical units (AU)). The orbital period is 28.1 Earth days. The planet's radius is unknown, and consequently, so is its composition.
In July 2012 GJ 667C c was listed as one of top 5 potentially habitable exoplanets by the Planetary Habitability Laboratory (PHL). However, given the caveats discussed in the article How many habitable planets have been found?, and the unkown physical parameters of GJ 667C c, such propositions must be regarded as tentative. In a paper by Anglada-Escudeé et al. (2012), the authors state:
Still, the ultimate water supporting capability of this candidate depends on properties that are unknown such as its albedo, atmospheric composition and interior dynamics.
Learn more about exoplanets with the book Exoplanets and Alien Solar Systems.
File under: GJ 667C c; super-Earths, Potential habitable zone exoplanet.