Deimos

The small outer companion

Mars’s smaller moon, an irregular body marked by impacts.

Educational illustration · shapes and sizes are not to scale.

Orbiting: Mars
Category: Natural satellite

What makes this world interesting

Its orbit takes about 30 hours. More distant than Phobos, it belongs to the same system of two small moons.

Observe or explore it

Its faintness and proximity to Mars make it difficult to observe.

Connect the discoveries

Mars

Sources and reference information

NASA Science — Deimos

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.