K2-188 is a Sun-like G-type star (about 1.06 solar masses, 5,977 K, 1.19 solar radii), 447 light-years from Earth. K2-188 b is a planet with 1.4 Earth radii, with an orbital period of 1.7 days, at 0.029 AU from its star, and an equilibrium temperature near 1,692 K, discovered in 2018 via transit. K2-188 c is a planet with 2.8 Earth radii, with an orbital period of 7.8 days, at 0.079 AU from its star, and an equilibrium temperature near 1,026 K, discovered in 2018 via transit.