TOI-559 is a Sun-like G-type star (about 1.03 solar masses, 5,925 K, 1.23 solar radii), 233 light-years from Earth. TOI-559 b is a 6.01-Jupiter-mass companion, with an orbital period of 7.0 days, at 0.072 AU from its star, and an equilibrium temperature near 1,180 K, on an eccentric orbit (e ≈ 0.15), discovered in 2021 via transit. The inner world is a hot Jupiter — a gas giant hugging its star at a fraction of Mercury's distance — a class that forced astronomers to rethink how giant planets form and migrate inward.