Kepler-197 and Its Four Planets

Kepler-197 is a star 1080 light-years away with four planets orbiting it. The host star is 5.37 billion years old, has 1.01 solar masses, and a radius of 1.17 solar radii, which is larger than the Sun's. Its temperature is 6180 K, hotter than the Sun's.

All four planets were discovered by transit in 2014. Kepler-197 b is Earth-like with a radius of 1.02 Earth radii and an orbital period of 5.6 days, the shortest year among the listed planets. Kepler-197 c is Earth-like, with a radius of 1.23 Earth radii - larger than Earth's and the largest among the listed planets - and an orbital period of 10.3 days, the second-shortest year. Kepler-197 d is also Earth-like, with a radius of 1.22 Earth radii, larger than Earth's and the second-largest among the listed planets, and an orbital period of 15.7 days, the second-longest year. Kepler-197 e is a Sub-Earth with a radius of 0.91 Earth radii, smaller than Earth's and the smallest among the listed planets, and an orbital period of 25.2 days, the longest year.