The Kepler-306 Exoplanetary System
Kepler-306 is a star with 0.615 times the mass of the Sun, and 0.72 times its radius. It is located 2586.42 light years away from the solar system.
Kepler-306 is known to have 4 exoplanets in orbit around it.
Kepler-306 b was discovered by the Kepler observatory using the transit method. Its discovery was announced in 2014-03. Its semi-major axis is 0.05 astronomical units, as compared to Earth's which is 1 astronomical unit. It takes 4.65 Earth days to complete an orbit around its host star, Kepler-306.
The mass of Kepler-306 b is 2.65 times the mass of Earth. The radius of Kepler-306 b is 1.52 that of Earth. At 2.65 Earth masses, Kepler-306 b is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes. No Super Earths are known to exist in our solar system, but if it exists, the so-called Planet Nine could very well be a super Earth, as it is hypothesized to have a mass between five and ten Earth masses.