GJ 3512 and Its Two Planets

GJ 3512 is an M-type dwarf, a small, cool red dwarf, located 30.9 light-years away. It is 5.5 billion years old, with a mass of 0.123 solar masses and a radius of 0.139 solar radii, and its temperature is 3080 K. Its reported mass, radius, and temperature are all smaller or cooler than the Sun's. Two planets are known to orbit this star.

Both planets were found by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. GJ 3512 b was discovered in 2019 and has a minimum mass of 147 Earth masses and an orbital period of 203 days. GJ 3512 c was discovered in 2020 and has a minimum mass of 144 Earth masses and an orbital period of 2350 days. Both minimum masses are larger than Earth's. Among the listed planets, GJ 3512 b has the shortest year, while GJ 3512 c has the longest year and the smallest minimum mass; GJ 3512 b has the largest minimum mass.