HD 136352 and Its Three Planets

HD 136352 is a G-type main-sequence star 47.9 light-years away. The star is 10.4 billion years old, has 0.91 solar masses, a radius of 1.04 solar radii, and a temperature of 5670 K. Its reported mass is smaller than the Sun's, while its radius is larger and its temperature cooler than the Sun's. Three planets are known to orbit this host.

HD 136352 b is a Super-Earth discovered in 2019 by radial velocity, a method that detects the wobble a planet's gravity induces in its star's motion. It has a mass of 4.72 Earth masses, a radius of 1.66 Earth radii, and an orbital period of 11.6 days, the shortest year among the listed planets. Both its radius and mass estimates are larger than Earth's, and its mean density is 5.64 g/cm³.

HD 136352 c is a Neptune-like planet also discovered in 2019 by radial velocity. It has a mass of 11.2 Earth masses, the largest reported mass among the listed planets, and the largest radius at 2.92 Earth radii, the greatest among the listed planets. Its radius and mass are larger than Earth's. Its orbital period is 27.6 days, the second-shortest year among the listed planets.

HD 136352 d is a Neptune-like planet discovered in 2019 by radial velocity. It has a mass of 8.82 Earth masses, the second-smallest reported mass among the listed planets, and a radius of 2.56 Earth radii, the second-smallest among the listed planets. Both its radius and mass are larger than Earth's. It takes 107 days to orbit the star, the longest year among the listed planets.