September 16, 2008
The three bright, finger-like jets of material seen here suggest that a small object has collided with the core of Saturn's F ring.
Cassini spacecraft imaging scientists have shown that the F-ring shepherd moon Prometheus influences the structure of the ring in two ways: by creating streamer-channel features as it closely approaches (and partially passes into) the ring (see Soft Collision) and by perturbing the orbits of small objects within the F ring region which then exert their own influence on nearby ring particles, as seen here.
These small, embedded objects could be temporary clumps of particles, but scientists think at least one of the objects could be a more permanent moonlet.
This view looks toward the sunlit side of the rings from about 40 degrees below the ringplane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Aug. 20, 2008. The view was obtained at a distance of approximately 685,000 kilometers (426,000 miles) from Saturn and at a Sun-ring-spacecraft, or phase, angle of 40 degrees. Image scale is about 5 kilometers (3 miles) per pixel.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. 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 and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.
Credit: NASA/JPL/Space Science Institute