Kepler-385 and Its Three Planets

Kepler-385 is a single star located 4670 light-years away. Its reported mass is 1.12 solar masses, making it more massive than the Sun, and its radius of 1.19 solar radii is also larger than the Sun's. The star is hotter than the Sun at 6090 K and is estimated to be 3.31 billion years old. Three planets are known to orbit this host.

All three planets are Neptune-like worlds discovered 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. Kepler-385 b and Kepler-385 c were both discovered in 2014, while Kepler-385 d was found in 2020.

Kepler-385 b has an orbital period of 10 days - its year - and a radius of 2.73 Earth radii, larger than Earth's. Kepler-385 c orbits in 15.2 days and has a radius of 3.04 Earth radii, also larger than Earth's. Kepler-385 d has an orbital period of 56.4 days and a radius of 2.62 Earth radii, again larger than Earth's.

Among the listed planets, Kepler-385 b has the shortest year by reported estimates at 10 days, and Kepler-385 d has the longest at 56.4 days. Kepler-385 c has the second-shortest year at 15.2 days. In radius, Kepler-385 c is the largest at 3.04 Earth radii, Kepler-385 b is second-smallest at 2.73 Earth radii, and Kepler-385 d is the smallest at 2.62 Earth radii.