HD 99706: A K-Type Star and Its Two Known Worlds

HD 99706 is a K0 star located 478 light-years away, with two planets known to orbit it. The star is 2.1 billion years old and has a mass of 1.72 solar masses and a radius of 5.4 solar radii, making it both more massive and larger than the Sun. Its temperature is 4930 K, cooler than the Sun's. A spectral type of K0 places it in the cooler, orange region of the temperature sequence.

Both planets were found using the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. HD 99706 b was discovered in 2011 and orbits once every 841 days. Its minimum mass is 391 Earth masses, roughly 1.23 times Jupiter's mass, and among the listed planets it has both the shortest year and the smallest minimum mass.

HD 99706 c was discovered in 2016 and takes 1280 days to complete one orbit. Its minimum mass is 1810 Earth masses, roughly 5.69 times Jupiter's mass. Among the listed planets, it has the longest year and the largest minimum mass.