Kepler-104 is a Sun-like G-type star (about 0.82 solar masses, 5,711 K, 1.35 solar radii), 401 light-years from Earth. Kepler-104 b is a planet with 3.1 Earth radii, with an orbital period of 11.4 days, at 0.094 AU from its star, discovered in 2014 via transit. Kepler-104 c is a planet with 3.1 Earth radii, with an orbital period of 23.7 days, at 0.153 AU from its star, discovered in 2014 via transit. Kepler-104 d is a planet with 3.6 Earth radii, with an orbital period of 51.8 days, at 0.257 AU from its star, discovered in 2014 via transit.