I've created an addon for Celestia, which adds the Kepler-22 star and its probably habitable planet 'b' to Celestia. Recommended to use Celestia 1.6 or newer. All informations about this system is valid. The system is located in the constellation Cygnus. The surface of the b planet is fictionally, because currently we haven't any information about this.
Installation: Just copy the Kepler-22 folder to your 'extras' folder, open Celetia, press ENTER and type 'Kepler-22'.
Kepler-22 on Wikipedia: http://en.wikipedia.org/wiki/Kepler-22
Its planet on wikipedia: http://en.wikipedia.org/wiki/Kepler-22b
Please write a reply how it works.
Download link: http://shogexplorer.uw.hu/celestia-addons/Kepler-22.zip
(Sorry for my bad english, I'm hungarian.)
Screenshots of the newest (1.2) version:



