HAT-P-29 is a Sun-like F-type star (about 1.45 solar masses, 6,087 K, 1.30 solar radii), 314 light-years from Earth. HAT-P-29 b is a 0.88-Jupiter-mass companion, with an orbital period of 5.7 days, on an eccentric orbit (e ≈ 0.09), discovered in 2011 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. The planet's large radius (13.1 Earth radii) indicates a bloated atmosphere heated by intense stellar radiation.