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Kepler 47

Kepler-47 is a planetary system made of at least two stars and two planets.

Kepler-47 A is a Sun-like star (0.96 solar radii, 1.04 solar masses) while Kepler-47 B is a red dwarf star (0.35 solar radii, 0.36 solar masses). The two stars are separated by 12.5 million kilometres (0.084 au), and they orbit each other in 7.45 days. The two stars are represented as a single one in this animation.

The two planets, Kepler-47 (AB) b and Kepler-47 (AB) c, were discovered thanks to the Kepler space telescope, by transits. The (AB) in their designation means that they orbit both stars at the same time. With radii of 3 and 4.6 Earth radii, they are similar to Uranus and Neptune (4 Earth radii). The inner planet is 44 million kilometres (0.30 au) away from the star and orbits the stars in 50 days (0.38 au and 88 days for Mercury around the Sun). The outer planet has an orbit similar to that of the Earth, with an orbit radius of 148 million kilometres (0.99 au) and an orbital period of 303 days.

Name Mass(MJ) Radius(RJ) Period(days) Discovery(date)
Kepler 47(AB)b 0.27 49 2012
Kepler 47(AB)c 0.41 303 2012

 

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Categories: Planet of the month

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