Kepler-47
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, Kepler-47d was announced,[6] with a shorter orbit than c.
Planetary system
Kepler-47b
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.
Kepler-47c
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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]
Kepler-47d
In November 2013, another exoplanet was announced as being discovered. This planet, named Kepler-47d, is about the size of planet "c", but orbits farther in then c does. It completes an orbit every 187.3 days.[6]
See also
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- NN Serpentis, a binary star announced to have two planets in 2010
- List of extrasolar planet firsts
References
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- ↑ 6.0 6.1 http://nexsci.caltech.edu/conferences/KeplerII/abstracts_talks/Orosz.pdf
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Coordinates: 
19h 41m 11.5s, +46° 55′ 12″
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