Kepler-975 and Its Two Planets

Kepler-975 is a star located 1390 light-years away. Its reported mass estimate is smaller than the Sun's, at 0.8 solar masses, while its radius is 0.75 solar radii. The star is 3.89 billion years old and has a temperature of 4900 K, which is cooler than the Sun's. Two planets are known to orbit this host: Kepler-975 b and Kepler-975 c, both found by the transit method, in which a planet passes in front of its star and causes a small dip in observed brightness.

Kepler-975 b was discovered in 2016 and is an Earth-like planet, a size class that stays within 1.5 times Earth's radius. Its radius is 1.48 Earth radii, larger than Earth's, and it completes one orbit in 1.97 days. Among the listed planets, it has the shortest year and the smallest radius. Kepler-975 c, discovered in 2023, is Jupiter-like, a class that exceeds 4 times Earth's radius. It has a radius of 10.7 Earth radii and an orbital period of 5.06 days; among the listed planets, it has the longest year and the largest radius.