TOI-406 is a cool M-dwarf (about 0.41 solar masses, 3,392 K, 0.41 solar radii), 31.1 light-years from Earth. TOI-406 c is a 2.1-Earth-mass planet, with an orbital period of 3.3 days, at 0.032 AU from its star, and an equilibrium temperature near 584 K, discovered in 2024 via transit. TOI-406.01 is a 6.6-Earth-mass planet, with an orbital period of 13.2 days, at 0.081 AU from its star, and an equilibrium temperature near 368 K, on an eccentric orbit (e ≈ 0.06), discovered in 2024 via transit.