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Solar system
Jupiter's moon, Callisto

4.5 billion years, about the same age as Jupiter


Solar system, in orbit around Jupiter

Avg. distance from Jupiter

1,882,700 km (1,170,000 mi)


4,820 km (3,000 mi)


1.076 x 1023 kg

Orbital period around Jupiter

16.7 days. The same side of Callisto always faces Jupiter. It takes the same amount of time to make one revolution on its axis as it does to complete an orbit around Jupiter.

Distinguishing features

Callisto, the outermost of the four Galilean moons, has an old surface that is perhaps the most heavily cratered of any object in the solar system. The moon's composition is roughly equal parts rocky material and water ice. Two enormous multi-ring impact structures are prominent features. Valhalla, the largest, has a central basin that is 600 km (370 mi) across and rings that extend to 3,000 kilometers (1,900 mi) in diameter. Asgard measures about 1,600 kilometers (1,000 mi) in diameter.

Jupiter's moon, Callisto

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"Fast Facts: Jupiter's moon, Callisto" is a table that lists the moon's age, location, average distance from Jupiter, diameter, orbital period around Jupiter, mass, and distinguishing features. A picture of Callisto is included.

Printer-friendly web page
Adaptable, at teacher's discretion
How to use in the classroom

Use this resource as:

A source of information. Read the table to find out about this object.

A large-number recognition and ordering activity. Have students review several Fast Fact moon tables, including this one. Have students read the tables to find each object's mass. Then ask them to arrange the objects according to their mass, from smallest to largest. Students also can arrange the objects according to their diameter.

A math activity. Use Newton's law of gravitation, the distance between Io and Jupiter, and the masses of the two objects to determine the gravitational force between them. (Recommended for grades 10-12)

An inquiry tool. Have students write down questions they would like answered about the image and the information in the Fast Facts table.

An engagement tool. Involve students in a discussion.

Related materials

Amazing Space resources by topic: Solar system

HubbleSite: Press releases on Moons