421,700 km (0.002 819  AU ) Eccentricity 0.0041 Orbital period 1.769 137 786 d (152 853.504 7 s, 42.459 306 86 h) Average orbital speed 17.334 km/s Inclination 2.21° (to the  ecliptic ) 0.05° (to Jupiter's equator) Satellite of Jupiter Proper orbital elements Physical characteristics Dimensions3,660.0 × 3,637.4 × 3,630.6 km [2] Mean radius1,821.3 km (0.286 Earths) [2] Surface area 41,910,000 km 2  (0.082 Earths) Volume 2.53