Kepler-878 is a star with 0.81 times the mass of the Sun, and 0.77 times its radius. It is located 2581.93 light years away from the solar system and is estimated to be 4.57 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
Kepler-878 is known to have 1 exoplanets in orbit around it.
Kepler-878 b was discovered by the Kepler observatory, in 2016-05, using the transit method. Its semi-major axis is 0.17 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of Kepler-878 b is 4.388 times the mass of Earth. The radius of Kepler-878 b is 1.930 that of Earth. With a mass below 5 Earth masses, a density of 3.35, and a semi-major axis of 0.165 astronomical units, Kepler-878 b could, potentially, be an ocean world - a planet with no dry land.