HD 5278 is a Sun-like F-type star (about 1.13 solar masses, 6,203 K, 1.19 solar radii), 57.6 light-years from Earth. HD 5278 b is a 7.8-Earth-mass planet, with an orbital period of 14.3 days, at 0.120 AU from its star, and an equilibrium temperature near 943 K, on an eccentric orbit (e ≈ 0.08), discovered in 2021 via transit. HD 5278 c is a 0.06-Jupiter-mass companion, with an orbital period of 40.9 days, at 0.242 AU from its star, on an eccentric orbit (e ≈ 0.07), discovered in 2021 via radial velocity.