HIP 67851: A K-Type Giant with Two Known Worlds

HIP 67851 is a star located 209 light-years away. Its spectral type is K0 III, placing it in the cooler K class, and it hosts two known planets. The star is estimated to be 5.46 billion years old, with a mass of 1.19 solar masses and a radius of 5.72 solar radii. Its temperature is 4810 K. Its reported mass and radius are each larger than the Sun's, while its reported temperature is cooler than the Sun's.

Both planets were discovered in 2015 using 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 67851 b has a minimum mass of 366 Earth masses, a lower bound on its true mass, and an orbital period of 89.2 days. HIP 67851 c has a minimum mass of 1580 Earth masses and an orbital period of 3130 days. Among the listed planets, HIP 67851 b has the shortest year by reported estimates and the smallest minimum mass, while HIP 67851 c has the longest year by reported estimates and the largest minimum mass. HIP 67851 b's minimum mass is roughly 1.15 times Jupiter's mass, and HIP 67851 c's minimum mass is roughly 4.97 times Jupiter's mass.