Triton

A large moon travelling the other way

Neptune’s main moon follows a retrograde orbit.

Educational illustration · shapes and sizes are not to scale.

Orbiting: Neptune
Category: Natural satellite

What makes this world interesting

It was probably captured. Voyager 2 observed an icy surface and signs of activity in 1989.

Observe or explore it

Its apparent proximity to Neptune and its faintness require suitable equipment and conditions.

Connect the discoveries

Neptune

Sources and reference information

NASA Science — Triton

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.