K2-37 is a Sun-like G-type star (about 0.84 solar masses, 5,352 K, 0.81 solar radii), 180 light-years from Earth. K2-37 b is a planet with 1.4 Earth radii, with an orbital period of 4.4 days, and an equilibrium temperature near 949 K, discovered in 2016 via transit. K2-37 c is a planet with 2.4 Earth radii, with an orbital period of 6.4 days, and an equilibrium temperature near 839 K, discovered in 2016 via transit. K2-37 d is a 12.5-Earth-mass planet, with an orbital period of 14.1 days, and an equilibrium temperature near 646 K, discovered in 2016 via transit.