Kepler-287 and Its Two Known Planets

Kepler-287 is a K7 V star, a classification that places it among the cooler, redder main-sequence stars. It lies 2730 light-years away and is reported to have an age of 4.57 billion years, a mass of 0.97 solar masses, a radius of 0.95 solar radii, and a temperature of 5650 K. That temperature is cooler than the Sun's. Two planets are known to orbit this host.

Both planets were discovered by the transit method and announced in 2014. Kepler-287 b is classified as a Super-Earth, a size class that reaches 2.5 times Earth's radius. Its reported radius is 2.33 Earth radii, larger than Earth's, and its orbital period is 20.3 days. Kepler-287 c is Neptune-like, the size class that reaches 4 times Earth's radius. Its reported radius is 3.26 Earth radii, also larger than Earth's, and its orbital period is 44.9 days. Among the listed planets, Kepler-287 b has the shortest year by reported estimates, while Kepler-287 c has the longest. Kepler-287 b also has the smallest radius, and Kepler-287 c the largest.