Solar System Exploration: Planets: Jupiter: Moons: Io: Facts & Figures

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Io

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Facts & Figures

Io: Facts & Figures

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Facts & Figures

Discovered By

Galileo Galilei

Date of Discovery

1610

Orbit Size Around Jupiter (semi-major axis)

Metric: 421,800 km

English: 262,094 miles

Periapsis (closest)

Metric: 420,071 km

Apoapsis (farthest)

Metric: 423,529 km

Sidereal Orbit Period (Length of Year)

1.769 Earth days

Orbit Circumference

Metric: 2,650,236.42 km

Average Orbit Velocity

Metric: 62,423.1 km/h

Orbit Eccentricity

0.0041

Orbit Inclination

0.036 degree

Mean Radius

Metric: 1821.6 km

By Comparison: 1830 x 1818.7 x 1815.3 km, tri-axial

Equatorial Circumference

Metric: 11,445.5 km

Volume

Metric: 25,319,064,907 km³

Mass

Metric: 89,319,379,731,108,900,000,000 kg

Scientific Notation: 8.9319 x 10²² kg

Density

Metric: 3.528 g/cm³

Surface Area

Metric: 41,698,064.74 km²

Surface Gravity

Metric: 1.796 m/s²

Escape Velocity

Metric: 8,552 km/h

English: 5,314 mph

Scientific Notation: 2376 m/s

Sidereal Rotation Period (Length of Day)

1.769 Earth days

42.456 hours

By Comparison: Synchronous with orbit period

Atmospheric Constituents

Sulfur dioxide

NASA Official: Kristen Erickson

Advisory: Dr. James Green, Director of Planetary Science

Outreach Manager: Alice Wessen

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