Amazing Space- Fast Facts: Neptune's moon, Triton

Age	4.5 billion years, about the same age as Neptune
Location	Solar system, in orbit around Neptune
Avg. distance from Neptune	354,759 km (219,965 mi)
Diameter	2700 km (1700 mi)
Mass	2.14 x 10²² kg
Orbital period around Neptune	5.877 days. Triton orbits in the opposite direction to Neptune’s rotation (called a retrograde rotation). In addition, the same side of Triton always faces Neptune.
Distinguishing features	Due to its retrograde rotation, Triton is believed to be a captured moon that was originally a Kuiper belt object. Triton is a little larger than the dwarf planets Pluto and Eris, but resembles Pluto in its composition. Knowledge of surface details comes from the Voyager 2 encounter in 1989. Images show a relatively flat surface with rocky outcroppings and canyons, active geyser-like eruptions, but few impact craters.