The Kepler-217 Exoplanetary System
Kepler-217 is a star with 2.3149999999999995 times the mass of the Sun, and 1.8 times its radius. It is located 3721.28 light years away from the solar system.
Kepler-217 is known to have 3 exoplanets in orbit around it.
Kepler-217 b was discovered by the Kepler observatory using the transit method. Its discovery was announced in 2014-03. Its semi-major axis is 0.07 astronomical units, as compared to Earth's which is 1 astronomical unit. It takes 5.37 Earth days to complete an orbit around its host star, Kepler-217.
The mass of Kepler-217 b is 6.60 times the mass of Earth. The radius of Kepler-217 b is 2.23 that of Earth. At 6.60 Earth masses, Kepler-217 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.