TIC 434398831 is a Sun-like G-type star (about 0.99 solar masses, 5,638 K, 0.91 solar radii), 217 light-years from Earth. TIC 434398831 b is a planet with 3.5 Earth radii, with an orbital period of 3.7 days, at 0.046 AU from its star, and an equilibrium temperature near 1,250 K, discovered in 2025 via transit. TIC 434398831 c is a planet with 5.6 Earth radii, with an orbital period of 6.2 days, at 0.066 AU from its star, and an equilibrium temperature near 1,050 K, discovered in 2025 via transit.