The Kepler-389 Exoplanetary System
Kepler-389 is a star with 0.685 times the mass of the Sun, and 0.79 times its radius. It is located 2725.52 light years away from the solar system.
Kepler-389 is known to have 2 exoplanets in orbit around it.
Kepler-389 b was discovered by the Kepler observatory using the transit method. Its discovery was announced in 2014-03. Its semi-major axis is 0.04 astronomical units, as compared to Earth's which is 1 astronomical unit. It takes 3.24 Earth days to complete an orbit around its host star, Kepler-389.
The mass of Kepler-389 b is 2.60 times the mass of Earth. The radius of Kepler-389 b is 1.51 that of Earth. At 2.60 Earth masses, Kepler-389 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.