Main article: Rocky Planets (Theoretical Models) A Hermian type planet is a theoretical model of a planet orbiting close to its parent star. The name is not official and comes from the adjective hermian meaning related to Mercury. A hotter planet will be a Vulcanoid Type Planet. The Solar System has one Hermian planet, helping us to understand how they will behave around other stars. Also, the Kepler Space Telescope has detected many similar planets.