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Exoplanetary Scratchpad

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An unusual 5 planet system (b-e-c-f-d) discovered by the Kepler spacecraft containing 3 Neptune-sized objects (b, c, d) and 2 Earth-sized objects (e, f), which are in alternating distances from the star, with the outermost one orbiting only in 78 days. Planet f has nearly the identical radius as Earth (1.03 RE), while planet e is the first sub-Earth planet (0.87 RE) discovered around a normal star, and were the smallest discovered yet at the time.

Kepler 20 System Web Pages[]

Kepler 20 System In the News[]

No Details on Smallest Planet Yet (2011)[]

Earth-Sized Planets Confirmed For First Time Around Normal Star (2011)[]

Year in Review (2011)[]

Probing Airless Rocky World's Surfaces (May 2013)[]

Kepler-22 System b, Kepler-20 System f, Kepler-11 System b: Planets that may have rocky surfaces.

See Also[]