From Wikipedia, the free encyclopedia
Jump to: navigation, search
Watch this video to learn more about the discovery of Kepler-47c a two-planet, two-star system.

Kepler-47 is a binary star system with at least three planets in orbit around the pair of stars located about 5,000 light-years away from Earth.[1] The first two planets announced are designated Kepler-47b, and Kepler-47c. Kepler-47 is the first circumbinary multi-planet system discovered by the Kepler mission.[2] The outermost of the planets is a gas giant orbiting within the habitable zone of the stars.[3] Because most stars are binary,[4] the discovery that multi-planet systems can form in such a system impacts theories of planetary formation.

A group of scientists from NASA and Tel-Aviv University in Israel discovered the system via NASA's Kepler space observatory in 2012.[5] In November 2013, confirmation of a third planet was announced.[6]


Kepler-47b is a gas giant and resides close to its parent stars and therefore is inhospitable to life. It is thought to be larger than Kepler-47c and is roughly three times the radius of Earth.[2] At present it is unknown if this planet has any moons.


Further information: Kepler-47c

This planet is situated within the habitable zone and its radius is 4 times the Earth's. Although it is assumed Kepler-47c is not capable of harbouring life.[7] Kepler-47c is marginally larger than Neptune and could possibly have a dense atmosphere.[8]

See also[edit]


  1. ^ "BBC News - Tatooine-like double-star systems can host planets". 2012-08-29. Retrieved 2012-11-04. 
  2. ^ a b "NASA's Kepler Discovers Multiple Planets Orbiting a Pair of Stars". NASA. 2012-08-28. Retrieved 2 September 2012. Kepler mission has discovered multiple transiting planets orbiting two suns for the first time 
  3. ^ "NASA's Kepler discovers multiple planets orbiting a pair of stars". 2012-08-28. doi:10.1126/science.1228380. Retrieved 2012-11-04. 
  4. ^ Quintana, Elisa, V. et al. (November 2006), "Terrestrial planet formation surrounding close binary stars", Icarus 185 (1): 1–20, arXiv:astro-ph/0607222, Bibcode:2006Icar..185....1Q, doi:10.1016/j.icarus.2006.06.016 
  5. ^ Shamah, David (30 August 2012). "New worlds discovered, courtesy of US-Israel team". The Times of Israel. Retrieved 30 August 2012. 
  6. ^
  7. ^ "Tatooine-like double-star systems can host planets". 
  8. ^ "Two planets ... Two stars: Nasa detects strange new solar system (and one of the planets occupies the life-supporting 'Goldilocks zone')". Daily Mail ( 30 August 2012. 

Coordinates: Sky map 19h 41m 11.5s, +46° 55′ 12″