HD 155193 b: A Planet Orbiting a Hotter, More Massive Star

HD 155193 is a star located 189 light-years away, and it hosts one known planet. The star's spectral type is F8 IV, placing it in the F-class range, which is hotter than the Sun's G-type class. Its reported mass estimate is 1.22 solar masses, larger than the Sun's, and its reported temperature is 6240 K, also hotter than the Sun's. A spectral type such as F8 IV classifies a star by temperature class, where the leading letter and number indicate its temperature, and the trailing designation marks its evolutionary state.

The single planet orbiting this star is HD 155193 b, discovered in 2021 using the radial velocity method. This method measures the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period. HD 155193 b has a minimum mass of 238 Earth masses, a lower bound on its true mass, and its minimum mass is larger than Earth's. It completes one orbit around its host in 353 days.