Kepler-1868 and Its Neptune-Like Planet

Kepler-1868 is a star 894 light-years away with one known planet. Its mass is 0.717 solar masses, its radius is 0.751 solar radii, and its temperature is 4550 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.

The planet Kepler-1868 b was discovered in 2021 by the transit method, in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. Repeated dips help establish orbital periods. Kepler-1868 b orbits once every 211 days, and its radius is 3.15 Earth radii. Its reported radius estimate is larger than Earth's. Under the size classes used here, which compare radius with Earth's, a Neptune-like planet reaches 4 times Earth's radius, the category Kepler-1868 b occupies.