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a Continuing Story of Discovery


Table of Contents

Overview of Callisto Facts

Callisto Quick-Look Statistics
Discovery:                             Jan 7, 1610 by Galileo Galilei
Diameter (km):                         4,806 
Mass (kg):                             1.077e23
Mass (Earth = 1)                       1.807e-02
Surface Gravity (Earth = 1):           0.127 
Mean Distance from Jupiter (km):       1,883,000 
Mean Distance From Jupiter (Rj):       26.6 
Mean Distance from Sun (AU):           5.203 
Orbital period (days):                 16.68902 
Rotational period  (days):             16.68902 
Density (gm/cm?3)                      1.86 
Orbit Eccentricity:                    0.007 
Orbit Inclination (degrees):           0.281 
Orbit Speed (km/sec):                  8.21 
Escape velocity (km/sec):              2.45 
Visual Albedo:                         0.19
Subsolar Temperature (K)               168
Equatorial Subsurface Temperature (K)  126
Surface Composition:                   Dirty Ice 

A Summary of Facts about Callisto

Latest Callisto Science Findings

Interior Structure

Surface Composition

Frequently Asked Questions about Callisto

Callisto Images

Missions Exploring Callisto

Educational Activities and Resources

The Mythology of Jupiter and it's Satellites

The planets and moons in our solar system are all named for characters in Greek and Roman mythology. Here are some stories and artwork about the namesakes of Jupiter and the Galilean satellites.

USGS Callisto Nomenclature page

The Discovery of the Galilean Satellites

Find out how Galileo Galilei discovered the moons around Jupiter.

Frequently asked Questions (FAQs)

  • General Galileo FAQ's
  • Online From Jupiter FAQ (April 6, 1997)
  • Galileo Webchats


    Links to Related Sites


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