HD 178911 B is a Sun-like G-type star (about 1.24 solar masses, 5,588 K, 1.08 solar radii), 41.0 light-years from Earth. HD 178911 B b is a 8.03-Jupiter-mass companion, with an orbital period of 71.5 days, at 0.340 AU from its star, on an eccentric orbit (e ≈ 0.11), discovered in 2001 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.