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A search of the time-series photometry from NASA's Kepler spacecraft revealsa transiting planet candidate orbiting the 11th magnitude G5 dwarf KIC 10593626with a period of 290 days. The characteristics of the host star are wellconstrained by high-resolution spectroscopy combined with an asteroseismicanalysis of the Kepler photometry, leading to an estimated mass and radius of0.970 +/- 0.060 MSun and 0.979 +/- 0.020 RSun. The depth of 492 +/- 10ppm forthe three observed transits yields a radius of 2.38 +/- 0.13 REarth for theplanet. The system passes a battery of tests for false positives, includingreconnaissance spectroscopy, high-resolution imaging, and centroid motion. Afull BLENDER analysis provides further validation of the planet interpretationby showing that contamination of the target by an eclipsing system would rarelymimic the observed shape of the transits. The final validation of the planet isprovided by 16 radial velocities obtained with HIRES on Keck 1 over a one yearspan. Although the velocities do not lead to a reliable orbit and massdetermination, they are able to constrain the mass to a 3{\sigma} upper limitof 124 MEarth, safely in the regime of planetary masses, thus earning thedesignation Kepler-22b. The radiative equilibrium temperature is 262K for aplanet in Kepler-22b's orbit. Although there is no evidence that Kepler-22b isa rocky planet, it is the first confirmed planet with a measured radius toorbit in the Habitable Zone of any star other than the Sun.

Kepler-22b: A 2.4 Earth-radius Planet in the Habitable Zone of a Sun-like Star