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Callisto
Callisto Moon

Moon of Jupiter: Callisto

Callisto is one of the 4 large Galilean moons of the planet Jupiter. It is comprised of equal parts rock and ice and is geologically dead, with it's surface covered with the oldest craters in the solar system. Callisto has a very thin atmosphere carbon dioxide and oxygen. It is almost as large as Mercury.

Callisto, along with Ganymede, Europa, and Io, (the Galilean moons) were discovered by the Italian astronomer Galileo Galilei in 1610.

For a listing of all moons, see Moons of the Planets.

Callisto Facts
      1. Mass (kg)
      2. 1.08e+23
      1. Radius (km)
      2. 2,400
      1. Density (gm/cm3)
      2. 1.86
      1. Distance from planet (km)
      2. 1,883,000
      1. Rotational period (days)
      2. 16.68902
      1. Orbital period (days)
      2. 16.68902
      1. Orbital velocity (km/sec)
      2. 8.21
      1. Eccentricity of orbit
      2. 0.007
      1. Inclination of orbit (°)
      2. 0.281
      1. Albedo
      2. 0.20
      1. Magnitude (Vo)
      2. 5.65
      1. Atmosphere
      2. carbon dioxide