HD 102843 b: A Long-Period Planet Orbiting a Cool Dwarf

HD 102843 is a K0 V star located 205 light-years from Earth. A spectral type such as K0 V classifies a star by temperature class and evolutionary state, and this one is cooler than the Sun, with a reported temperature of 5460 K. Its mass is 0.95 solar masses and its radius is 0.951 solar radii. One planet orbits this host.

That planet is HD 102843 b, discovered in 2019 by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. Its minimum mass is 114 Earth masses, a lower bound on its true mass, and this is larger than Earth's. The planet completes one orbit every 3090 days.