Triton is the largest satellite/moon of the planet Neptune and was discovered by British astronomer William Lassell on October 10, 1846.

Voyager 2 took this close up image of satellite Triton during a close flyby on August 25, 1989. This composite image was constructed using about a dozen pictures and the colour correction was added to the lower resolution images.  Triton is relatively flat with some  outcrops, ridges, plateaus, icy plains and a few craters. The large south polar cap at the bottom of the image is highly reflective and slightly pink in color; it is believed that it may consist of a slowly evaporating layer of nitrogen ice deposited during the previous winter.