Blast From The Past #9
Voyager 2 image of crescent Triton taken as the spacecraft was speeding away from this moon of Neptune.
Two clear filter images were used and colorized by green and violet frames taken by the narrow-angle camera. Low light conditions and high phase angle necessitated long exposures which severely increased noise.
Triton's tenuous atmosphere shows itself as a subtle glow around the disc as well as extending the crescent "horn" further than would normally be visible if the moon had no atmosphere.
Possible streaks of wind-swept geyser plumes can be seen near the top.
Taken on August 25, 1989 from roughly 500 000 km from the moon. Phase angle was 134.5 deg.