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Kepler-22b, is an extrasolar planet orbiting within the empirical habitable zone of the Sun-like star Kepler-22. It is located about 638 light-years (196 pc) from Earth in the constellation of Cygnus.
Kepler-22b's size is roughly twice that of Earth. Its mass and surface composition are unknown. An Earth-like composition for the planet has been ruled out. It is likely to have a volatile-rich composition with a liquid or gaseous outer shell. The only parameters of the planet's orbit that are currently available are its orbital period, which is about 290 days, and its inclination, which is approximately 90°. Evidence suggests that the planet has a moderate surface temperature, assuming that the surface is not subject to extreme greenhouse heating. In the absence of an atmosphere, its equilibrium temperature (assuming an Earth-like albedo) would be approximately 262 K (−11 °C), compared to Earth's 255 K (−18 °C).
Image and data transmission courtesy of NASA