Mag.	Diam. mi.	Orbit Radius mi.	Orbit Period Days
IO	5.0	2,260	262,000	1.78
EUROPA	5.3	1,950	417,000	3.55
GANYMEDE	4.6	3,270	664,000	7.15
CALLISTO	5.6	2,980	1,171,000	16.69