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

	Io	Jupiter
Discovered By	Galileo Galilei	Known by the Ancients
Date of Discovery	1610	Unknown
Average Orbit Distance	422,000 km	778,412,020 km
Equatorial Radius	1830 x 1818.7 x 1815.3 km	71,492 km
Mass	89,316,000,000,000,000,000,000 kg	1,898,700,000,000,000,000,000,000,000 kg
Orbit Eccentricity	0.004	.04839
Orbital Inclination to Ecliptic	0.04 degree	1.305 degrees
Atmospheric Constituents	Sulfur dioxide	Hydrogen, Helium

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