HD 9446 and Its Two Worlds

HD 9446 is a G-type dwarf, a Sun-like star, located 164 light-years away. Its mass is 1 solar masses, its radius is 1 solar radii, and its surface temperature is 5790 K. Two planets are known to orbit this star.

HD 9446 b was discovered in 2009 by the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. It has a minimum mass of 222 Earth masses, meaning its true mass is at least this value. Its orbital period is 30.1 days, the shortest year among the listed planets.

HD 9446 c was also discovered in 2009 by radial velocity. Its minimum mass is 578 Earth masses, roughly 1.82 times Jupiter's mass. This is the largest minimum mass among the listed planets. Its orbital period is 193 days, the longest year among the listed planets.

Both planets have minimum masses larger than Earth's, and their orbital periods are measured in days.