Prometheus orbits Saturn just inside the skinny F ring. It Saturn's most elongated known moon, being about 148 kilometers long but only 68 kilometers wide. Its periodic encroachment into the F ring creates the dark lanes visible in the inner part of the ring. This photo was taken 15 March 2015 as a part of a high-resolution movie that also included Pandora.
Prometheus, Pandora, and the braided F ring in motion
98 frames shot between 15 March 2015 00:27:00 and 04:53:14 with each frame taken 163 seconds after the last. Some cosmic ray hits have been cleaned up. Video plays once at 20 frames per second, then repeats with annotations at 2 frames per second. Play in HD for best quality.
And here is Pandora:
NASA / JPL-Caltech / SSI / Emily Lakdawalla
Pandora and the braided F ring
Pandora orbits Saturn just outside the F ring. It is 110 kilometers long by 62 kilometers wide. This photo was taken 15 March 2015 as a part of a high-resolution movie that also included Prometheus.