This chart shows the differences between Ganymede and Jupiter. To change the planets/moons being compared, change one or more of the form fields at the bottom and click Refresh.

	Ganymede	Jupiter
Discovered By	Galileo Galilei	Known by the Ancients
Date of Discovery	1610	Unknown
Average Orbit Distance	1,070,400 km	778,340,821 km
Perihelion/Perigee (closest)	1,069,008 km	740,679,835 km
Aphelion/Apogee (farthest)	1,071,792 km	816,001,807 km
Equatorial Radius	2,631.2 km	69,911 km
Equatorial Circumference	16,532.3 km	439,263.8 km
Volume	76,304,506,998 km3	1,431,281,810,739,360 km3
Mass	148,185,846,875,052,000,000,000 kg	1,898,130,000,000,000,000,000,000,000 kg
Density	1.942 g/cm3	1.326 g/cm3
Surface Area	86,999,665.93 km2	61,418,738,571 km2
Equatorial Surface Gravity	1.428 m/s2	24.79 m/s2
Escape Velocity	9,869 km/h	216,720 km/h
Rotation Period (Length of Day)	7.155 sidereal days	0.41354 sidereal days
Mean Orbit Velocity	39,165.6 km/h	47,002 km/h
Orbit Eccentricity	0.0013	0.04838624
Orbit Inclination to Ecliptic	0.177 degree	1.304 degrees
Orbit Circumference	6,725,518.71 km	4,887,595,931 km
Atmospheric Constituents	Oxygen	Hydrogen, Helium