HD 155358 and Its Two Known Planets

HD 155358 is a G0 star located 142 light-years away. Its mass is 0.92 solar masses, its temperature is 5900 K, and its age is 10.7 billion years. Two planets are known to orbit this host.

Both planets were discovered in 2007 using the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. HD 155358 b has a minimum mass of 315 Earth masses and an orbital period of 194 days, giving it the shortest year among the listed planets. HD 155358 c has a minimum mass of 261 Earth masses and an orbital period of 392 days, the longest year among the listed planets and the smallest minimum mass of the pair. HD 155358 b's minimum mass is larger than Earth's, as is HD 155358 c's, and the star's reported temperature is hotter than the Sun's.