Callisto

A record of impacts

A large moon with an ancient, heavily cratered surface.

Educational illustration · shapes and sizes are not to scale.

Orbiting: Jupiter
Category: Natural satellite

What makes this world interesting

Its many impact basins preserve a record of the Jovian system’s history.

Observe or explore it

The outermost of the four Galilean moons can lie quite far from Jupiter in the eyepiece field.

Connect the discoveries

Jupiter

Sources and reference information

NASA Science — Callisto

Rounded educational data, sources consulted on 18 October 2026. Orbital distances are mean reference distances from the Sun, not current distances from Earth. Periods are expressed in Earth time. The planner provides date-specific positions for supported targets.