HD 219139 is a Sun-like G-type star (about 1.46 solar masses, 4,831 K, 11.2 solar radii), 105 light-years from Earth. HD 219139 b is a 0.78-Jupiter-mass companion, with an orbital period of 276 days, at 0.940 AU from its star, on an eccentric orbit (e ≈ 0.11), discovered in 2021 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.