HIP 105854 and Its Lone Planet

HIP 105854 is a K2 III star 256 light-years away, with a reported mass of 2.1 solar masses and a temperature of 4780 K. Its mass estimate is larger than the Sun's, while its temperature is cooler. The system hosts one known planet.

That planet, HIP 105854 b, was discovered in 2014 by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period. HIP 105854 b has a minimum mass of 2610 Earth masses, larger than Earth's and roughly 8.2 times Jupiter's mass. Its orbital period is 184 days. A minimum mass is a lower bound on a planet's true mass, differing from an ordinary mass estimate.