WASP-80 is an orange K-type dwarf (about 0.58 solar masses, 4,143 K, 0.59 solar radii), 49.8 light-years from Earth. WASP-80 b is a 0.54-Jupiter-mass companion, with an orbital period of 3.1 days, at 0.034 AU from its star, and an equilibrium temperature near 825 K, discovered in 2012 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.