Skip to content
aidb
Io
Image: Wikimedia Commons

Io

Innermost of the 4 Galilean moons of Jupiter

Moonmoon of Jupiterregular moonQ3123

Also known as Jupiter I · Io (moon)

Orbits
Mass
Radius
Orbital period
  • 1.7691 days
Semi-major axis
  • 421,800 km
Discovered by
Discovered
  • January 7, 1610

Overview

All data

58 statements · 21% with external sources · numbers in brackets are citations

Named after
Periapsis
  • 420,000 km
Apoapsis
  • 423,400 km
Eccentricity
  • 0.0041
Area
  • 41.9M km²
Volume as quantity
  • 2.53B cubic kilometre
Density
  • 3.528 g/cm³
Albedo
  • 0.63
Apparent magnitude
  • 5.02 astronomical filter: V band
Temperature
Inclination
  • 2.213 degree
Diameter
  • 3,660 km
Surface gravity
  • 1.796 centimetre per square second
Named by
Members / parts
Part of
Provisional designation
  • Jupiter I

On other databases

28 identifiers linking Io across the web's reference databases