WASP-103 is a Sun-like F-type star (about 1.22 solar masses, 6,110 K, 1.44 solar radii), 376 light-years from Earth. WASP-103 b is the first exoplanet whose tidal deformation was measured, a bulge raised by the gravity of its host star. WASP-103 b is a 1.49-Jupiter-mass companion, with an orbital period of 22.2 hours, at 0.020 AU from its star, and an equilibrium temperature near 2,508 K, discovered in 2014 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.