Kepler-18 is a Sun-like G-type star (about 0.97 solar masses, 5,345 K, 1.11 solar radii), 433 light-years from Earth. Kepler-18 b is a 6.9-Earth-mass planet, with an orbital period of 3.5 days, at 0.045 AU from its star, discovered in 2011 via transit. Kepler-18 c is a 0.05-Jupiter-mass companion, with an orbital period of 7.6 days, at 0.075 AU from its star, discovered in 2011 via transit. Kepler-18 d is a 0.05-Jupiter-mass companion, with an orbital period of 14.9 days, at 0.117 AU from its star, discovered in 2011 via transit.