HD 169830 and Its Two Known Planets

HD 169830 is an F8 V star 123 light-years away, with a spectral type indicating a main-sequence star somewhat hotter than the Sun. It hosts two known planets, both discovered by the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. The star is 2.5 billion years old, holds 1.4 solar masses, spans 1.73 solar radii, and has a temperature of 6310 K. Its reported mass and radius estimates are larger than the Sun's, and its reported temperature is hotter than the Sun's.

HD 169830 b was discovered in 2000. Its minimum mass is 804 Earth masses, a lower bound on its true mass rather than an ordinary estimate, and its orbital period is 226 days, the shortest year among the listed planets. HD 169830 c was discovered in 2003, with a reported mass estimate of 2440 Earth masses and an orbital period of 1820 days, the longest year among the listed planets.