HIP 10090 and Its Two Known Planets

HIP 10090 is a K0 star 269 light-years away with two planets. Its mass is 0.94 solar masses, less than the Sun's mass, and its reported temperature of 5660 K is cooler than the Sun's. The star's age is 4.97 billion years.

Both planets were discovered in 2026 using the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion as repeated wobbles reveal the planet and its orbital period. HIP 10090 b has a mass of 1230 Earth masses, larger than Earth's and roughly 3.87 times Jupiter's mass. It has the longest year among the listed planets, with an orbital period of 2960 days. HIP 10090 c has a mass of 270 Earth masses, larger than Earth's and the smallest reported mass among the listed planets. It also has the shortest year among them, completing an orbit in 322 days.