The extreme contrast in this view of the unlit side of Saturn's rings is
intentional. Contrast-enhanced views like this are used to look for spokes
(the transient, ghostly lanes of dust seen in NASA Voyager and Hubble
Space Telescope images), but so far, none have been seen by Cassini.
The apparent absence of spokes is thought to be related to the Sun's
elevation angle above the ringplane, which currently is rather high. As
summer wanes in the southern hemisphere, the Sun's angle will drop, and
spoke viewing is expected to become more favorable.
In unlit-side views, the denser ring regions (and empty gaps) appear dark,
while less populated and dustier ring regions appear bright.
The image was taken in visible light with the Cassini spacecraft
wide-angle camera on Aug. 3, 2005, at a distance of approximately 781,000
kilometers (485,000 miles) from Saturn. The image scale is 43 kilometers
(27 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 team is based at the Space Science
Institute, Boulder, Colo.
For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov.
For additional images visit the Cassini imaging team homepage http://ciclops.org.
