Moon
Callisto
TypeMoon
Mass1.076 × 10²³ kg
Diameter4,821 km
Orbital Radius1.9 million km
Orbital Period16.69 days
Rotation Period400.54 hours
Known Moons0
Surface Gravity1.24 m/s²
Average Temp-139 °C
AtmosphereCO2 (thin)
Discovered ByGalileo Galilei
Discovery Year1610
About Callisto
Jupiter second largest moon. The most heavily cratered object in the solar system. Has a subsurface ocean that might contain the building blocks for life. Its surface has not changed significantly in 4 billion years. Farthest from Jupiter of the Galilean moons.
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