Neptune and Triton - Voyager 2
OGV color image of Neptune and Triton as Voyager 2 departed the Neptune system. This image was taken around 735 UT on August 31, 1989.
The small amounts of chromatic aberration around the horns of the crescent Neptune are due to smearing of the images during the long exposures necessary to image Neptune in the low lighting of the outer Solar System.
Image Credit: NASA / JPL / Voyager-ISS / Justin Cowart