Kepler-298: A Distant Star With Three Known Worlds

Kepler-298 is a star located 1690 light-years away, and it hosts three planets. The star is estimated to be 2.4 billion years old and has a reported mass of 0.69 solar masses and a radius of 0.65 solar radii. Its reported temperature is 4610 K, cooler than the Sun.

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. The planets orbit in 10.5 days, 22.9 days, and 77.5 days.

Kepler-298 b is a Super-Earth with an orbital period of 10.5 days and a radius of 1.96 Earth radii. Among the listed planets, it has the shortest year and the second-smallest radius. Kepler-298 c is also a Super-Earth, with an orbital period of 22.9 days and a radius of 1.93 Earth radii; it has the second-shortest year and the smallest radius among the listed planets. Both planets have radii larger than Earth's.

Kepler-298 d is Neptune-like, with an orbital period of 77.5 days and a radius of 2.5 Earth radii. It has the longest year and the largest radius among the listed planets, and its radius is also larger than Earth's.