[For trouble viewing the images/movies on this page, go here]
Dione steps in front of Tethys for a few minutes in an occultation, or mutual event. These events occur frequently for Cassini when the spacecraft is orbiting close to the ringplane.
The image was taken in visible red light with the Cassini spacecraft narrow-angle camera on Feb. 10, 2006, at a distance of approximately 3.7 million kilometers (2.3 million miles) from Dione and 4 million kilometers (2.5 million miles) from Tethys. Resolution in the original image was 22 kilometers (14 miles) per pixel on Dione (1,126 kilometers, 700 miles across) and 24 kilometers (15 miles) per pixel on Tethys (1,062 kilometers, 660 miles across). The image has been magnified by a factor of two.
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.