Recognised as Moon
Io
- Moon
- 0.18× Earth gravity
- Orbits Jupiter
Io is a moon with a mean radius of 1,822 km and a surface gravity of 1.8 m/s², which is 0.18× Earth's, so a 70 kg person would weigh 12.8 kg there. Escape velocity is 2.56 km/s. It is the most volcanically active body in the solar system.
Physical properties
Mass0.0893 × 10²⁴ kg≈measured
Mean radius1,822 km≈
Circumference11,445 km
Surface area41,698,065 km²
Volume25.3191 × 10⁹ km³one cubic kilometre is 10⁹ cubic metres
Mean density3,528 kg/m³water is 1,000 kg/m³
Gravity and escape
Surface gravity1.797 m/s²0.183× Earth's
Escape velocity2.558 km/sthe speed needed to leave without further propulsion
A 70 kg person would weigh12.8 kg-forcemass is unchanged; only the weight differs
A 1 kg mass would weigh1.797 newtons
Fall in 1 second0.898 mfrom rest, ignoring any atmosphere
Rotation and orbit
Day length (sidereal)42.46 hours
Orbital period1.769 Earth days
OrbitsJupiter
KindMoon
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