Kepler-352 and Its Three Planets

Kepler-352 is a star located 824 light-years away. It is estimated to be 3.47 billion years old, with a mass of 0.86 solar masses and a radius of 0.8 solar radii. Its temperature is 5280 K. The star's reported mass estimate is smaller than the Sun's, its reported radius estimate is smaller than the Sun's, and its reported temperature is cooler than the Sun's. Three planets are known to orbit this host.

Kepler-352 b and Kepler-352 c were both discovered in 2014 by the transit method, while Kepler-352 d was discovered in 2021 by the same method. A transit occurs when a planet passes in front of its star from our viewpoint, causing a small dip in observed brightness. Repeated dips help establish orbital periods, which are the times the planets take to complete one orbit.

Kepler-352 d has an orbital period of 6.89 days and a radius of 0.806 Earth radii. It is classified as a Sub-Earth, meaning its radius is smaller than Earth's. Among the listed planets, it has the shortest year and the smallest radius by reported estimates. Kepler-352 b has an orbital period of 10.1 days and a radius of 0.86 Earth radii. It is also a Sub-Earth, with a radius smaller than Earth's. Among the listed planets, it has the second-shortest year and the second-smallest radius by reported estimates.

Kepler-352 c has an orbital period of 16.3 days and a radius of 1.24 Earth radii. It is classified as Earth-like, a size class for planets within 1.5 times Earth's radius, and its reported radius estimate is larger than Earth's. Among the listed planets, it has the longest year and the largest radius by reported estimates.