Kepler-402 and Its Four Worlds

Kepler-402 is a star located 2040 light-years away. It is 3.31 billion years old and has a reported mass of 1.15 solar masses and a radius of 1.24 solar radii, both larger than the Sun's. Its reported temperature of 6200 K is hotter than the Sun's.

Four planets are known to orbit this star: Kepler-402 b, Kepler-402 c, Kepler-402 d, and Kepler-402 e. All four were discovered by the transit method in 2014, which means they were detected as they passed in front of the star from our viewpoint, causing small dips in its observed brightness.

The planets orbit close to their star. Kepler-402 b has the shortest year among the listed planets, at 4.03 days, and the smallest radius, at 1.22 Earth radii. Kepler-402 c has the second-shortest year, at 6.12 days, and the largest radius, at 1.56 Earth radii. Its reported radius estimate is larger than Earth's, and it is classified as a Super-Earth, a size class reaching up to 2.5 times Earth's radius. Kepler-402 d has the second-longest year, at 8.92 days, and the second-smallest radius, at 1.38 Earth radii. Its reported radius estimate is larger than Earth's, and it is classified as Earth-like. Kepler-402 e has the longest year among the listed planets, at 11.2 days, and the second-largest radius, at 1.46 Earth radii. Its reported radius estimate is larger than Earth's, and it is also classified as Earth-like, a size class that stays within 1.5 times Earth's radius. Kepler-402 b, too, is Earth-like.