Larger than 750 km Body (a) Radius (b) Body (a) (km) (R⊕) Ganymede Jupiter III 7003263410000000000♠2634.1±0.3 0.4135 Titan Saturn VI 7003257600000000000♠2576±2 (w/o gas) 0.4043 Mercury 7003243969999999999♠2439.7±1.0 0.3829