HD 218566 is an orange K-type dwarf (about 0.76 solar masses, 4,730 K, 0.85 solar radii), 28.8 light-years from Earth. HD 218566 b is a 0.20-Jupiter-mass companion, with an orbital period of 226 days, at 0.690 AU from its star, on an eccentric orbit (e ≈ 0.30), discovered in 2010 via radial velocity. The planet betrayed itself through the star's reflex motion — a technique that first revealed worlds around Sun-like stars in the 1990s and remains a workhorse of exoplanet discovery. The planet's marked eccentricity suggests past scattering events or perturbations from unseen companions.