Kepler-22b
Kepler-22b's first transit in front of its host sun was observed on Kepler's third day of scientific operations in mid-2009. Kepler-22b's third transit was detected in late 2010. The Spitzer Space Telescope provided more data that confirmed Kepler-22b's transits. On December 5, 2011, the confirmation of the existence of Kepler-22b was announced.