Kepler-770 and Its Three Planets

Kepler-770 is a star located 3030 light-years away. It hosts three planets. The star's reported mass estimate is smaller than the Sun's, at 0.94 solar masses, and its radius is 0.92 solar radii. Its reported temperature is cooler than the Sun's, at 5600 K, and its age is 4.57 billion years.

All three planets were discovered by transit, the method in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness, with repeated dips helping establish orbital periods. Kepler-770 b is a Super-Earth with a radius of 2.3 Earth radii and an orbital period of 18.9 days. Kepler-770 c is Earth-like, with a radius of 1.2 Earth radii and an orbital period of 1.48 days. Kepler-770 d is also Earth-like, with a radius of 1.4 Earth radii and an orbital period of 4.15 days. Among the listed planets, Kepler-770 b has the largest radius and the longest year by reported estimates. Kepler-770 c has the smallest radius and the shortest year, while Kepler-770 d has the second-smallest radius and the second-shortest year.

The entire system was identified in 2016.