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Orbit data - Object data - Atmosphere - Mythology - Links Go to the bottom of the page
Photo of the satellite Io of the planet Jupiter
Io   Jupiter I

Hide this area Orbit data
Mean distance from the planet Jupiter 421.600 km
Orbital period around the planet Jupiter (sideric) 1,769 d
Mean orbital velocity 17,33 km/s
Orbital inclination 0,04 °
Eccentricity of the orbit around the planet Jupiter 0,0041
Hide this area Object data
Discovered by Simon Marius, Galileo Galilei 1610
Mass 8,932 × 1022 kg
Equatorial radius 1821,6 km
Mean density 3,529 g/cm³
Escape velocity 2,56 km/s
Surface force of gravity 1,80 m/s²
Rotational period (synchronous) 1,769 d
Mean surface temperature 118 K
Albedo 0,62
Apparent magnitude + 5,0 mvis
Hide this area Atmosphere
  Sulfur dioxide (SO2)
Hide this area Mythology

Io was an Argive princess and the daughter of Inachos, an ancient hero or river god of Argos.

She also had the misfortune to be subjected to the lust of Zeus. Zeus, in an attempt to avoid the rage and jealousy of Hera, his wife, transformed Io into a handsome white heifer. Upon reaching Egypt and the Nile, Io bore Zeus a son, Epaphus.

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File icon The Jupiter Satellite Page
Scott S. Sheppard
File icon NASA (Voyager, Galileo) - The Jupiter System
© Calvin J. Hamilton ("Views of the Solar System")
File icon NASA (Voyager, Galileo) - Color Image of Io
© Calvin J. Hamilton ("Views of the Solar System")
File icon NASA/AMES (Galileo) - Io in front of Jupiter
Link to the page "Views of the Solar System"
File icon Welcome to the Planets
Online version of the "Planetary Data System Educational CD-ROM"
File icon A Multimedia Tour of the Solar System - The Nine Planets
© William A. Arnett
© 2021 by Bernd Onasch - Imprint Go to the top of the page