Diameter Mass Orbital radius Orbital period km  % kg  % km  % days  % Io ˈaɪ.oʊ 3643 105 8.9×10 22 120 421,700 110 1.77 7 Europa jʊˈroʊpə 3122 90 4.8×10 22 65 671,034 175 3.55 13 Ganymede ˈɡænimiːd 5262 150 14.8×10 22 200 1,070,412 280 7.15 26 Callisto kəˈlɪstoʊ 4821 140