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Prometheus (86 kilometers, 53 miles across) has just passed - and gravitationally disturbed - some of the fine particulate material in the F ring, creating the sheared gap visible in the inner strands of the ring.
This view looks down from about 10 degrees above the ringplane. Prometheus and the rings are sunlit from below. At lower right lies the outermost part of the A ring, which grows suddenly brighter outside of the 42-kilometer (26-mile) wide Keeler gap.
The image was taken in visible green light with the narrow angle camera on Aug. 2, 2005 from a distance of approximately 632,000 kilometers (392,000 miles) from Prometheus and at a Sun-Prometheus-spacecraft, or phase, angle of 122 degrees. Image scale is 4 kilometers (2 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 Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. 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.