Io

Natural satellite of Jupiter


Discovered by Galileo in 1610.

It is designated Jupiter I

Physical Parameters

Equatorial Diameter 3659 kilometres
Reciprocal Mass (Jupiter=1) 21400
Density (water=1) 3,530 kilograms per cubic metre
Escape velocity 2.56 kilometres per second

Orbital Parameters

Mean Distance from Jupiter 421,600,000 kilometres
Mean Sidereal Period 1.769 earthdays
Eccentricity 0.004
Inclination 0.04 degrees
Opposition Magnitude (Average) 5.0


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