CICLOPS: Cassini Imaging Central Laboratory for OPerationS
The Effect of Prometheus on the F Ring

The Effect of Prometheus on the F Ring
PIA 12787

Avg Rating: 9.58/10

Full Size: 1280x720
Flash 90.8 MB
Quicktime 114.7 MB
MP4 movie 138.6 MB


Avg Rating: 10/10

Half Size: 640x370
Flash 22.4 MB
Quicktime 28.6 MB
MP4 movie 37.0 MB
  This movie features a simulation showing the changes to a portion of Saturn's F ring as the shepherding moon Prometheus swings by it. The animation uses data obtained by the imaging cameras aboard NASA's Cassini spacecraft.

This computer-generated simulation depicts a 10-degree portion of the F ring (out of the 360-degree sweep of the full F ring). Prometheus moves from left to right just below the field of view.

The movie, "Dance of Particles in Saturn's F Ring," starts by showing the segment over an eight-day period just as Prometheus first passes by. It then jumps to a time 60 days later as we follow Prometheus's return for four days as it interacts with this section of the ring again. This version of the movie also shows a sequence of images of the F ring, Prometheus and the moon Pandora, obtained by Cassini's cameras (see PIA07712).

The gravity of potato-shaped Prometheus (which averages 86 kilometers, or 53 miles across, but is, at its longest, 148 kilometers, or 92 miles, across) periodically creates streamer-channels in the F ring. To learn more and to watch another movie of this process, see PIA08397.

In the simulation, the ring particles bunch up and form clumps at the edges of the channels created by Prometheus. Each passage of Prometheus triggers the formation of objects at the channel edges, and these objects evolve with respect to the core of the F ring. These objects are likely clumps that are an integral part of the core of the ring rather than fully formed moonlets. This simulation helps to explain the complexity of the structure of the F ring.

The animation was made by a Cassini imaging team member based at Queen Mary, University of London.

The Cassini Equinox Mission is a joint United States and European endeavor. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.

For more information about the Cassini Equinox Mission visit, and

Credit: NASA/JPL/Space Science Institute
Released: July 20, 2010 (PIA 12787)
Image/Caption Information