It is thus likely to have a more volatile-rich composition with a liquid or gaseous outer shell this would make it similar to Kepler-11f, the smallest known gas planet. An Earth-like composition is ruled out to at least 1-sigma uncertainty by radial velocity measurements of the system. It might also be comparable to the water-rich planet Gliese 1214 b although Kepler-22b, unlike Gliese 1214 b, is in the habitable zone. Kepler-22b, dubbed by scientists as a 'water world', might be an 'ocean-like' planet. (2013) does not reliably detect the mass (the best fit is 52.8 M Earth). Its mass and surface composition remain unknown, with only some very rough estimates established: it has fewer than 124 Earth masses at the 3-sigma confidence limit, and fewer than 36 Earth masses at 1-sigma confidence. Kepler-22b's radius is roughly 2.4 times that of Earth. It was discovered by the Kepler Space Telescope in December 2011. It is about 600 light-years (180 pc) from Earth in the constellation of Cygnus. Kepler-22b is an extrasolar planet orbiting around the star Kepler-22. Confirmation of the existence of Kepler-22b was announced on 5 December 2011. The planet's first transit was observed on. In the absence of an atmosphere, its equilibrium temperature (assuming an Earth-like albedo) would be approximately 262 K (−11 ☌ 12 ☏), compared with Earth's 255 K (−18 ☌ −1 ☏). Evidence suggests that the planet has a moderate surface temperature, assuming that the surface is not subject to extreme greenhouse heating. The only parameters of the planet's orbit that are currently available are its orbital period (about 290 days) and its inclination (approximately 90°). However, 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. Its mass and surface composition are unknown. Kepler-22b's radius is roughly about twice that of Earth. Kepler-22 is too dim to be seen with the naked eye. It was discovered by NASA's Kepler Space Telescope in December 2011 and was the first known transiting planet to orbit within the habitable zone of a Sun-like star, where liquid water could exist on the planet's surface. It is located about 600 light-years (180 parsecs) from Earth in the constellation of Cygnus. Kepler-22b (also known by its Kepler object of interest designation KOI-087.01) is an exoplanet orbiting within the habitable zone of the Sun-like star Kepler-22.
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