As Cassini approached the intriguing ice world of Enceladus for its
extremely close flyby on July 14, 2005, the spacecraft obtained images in
several wavelengths that were used to create this false-color composite
view.
The surface of Saturn's moon Enceladus shows a range of crater ages,
including regions that have very few discernable craters at Cassini's
resolution. This observation indicates that there have been multiple
episodes of activity on Enceladus spread over some fraction of its
history. The resurfacing mechanism appears to be dominated by tectonic
fracturing. As of yet, there is no clear evidence for release of liquid
to the surface in either icy volcanic flows or geysers.
The south polar region (seen here at the lower right) has a distinctive
tectonic structure that sets it apart from the rest of the satellite. Its
outer boundary is marked by a series of pronounced tectonic "gashes" that
form a hoop-like boundary, near 60 degrees south latitude. In this image,
this fault zone forms the transition region from the presumably older,
cratered terrain in the north to the younger, nearly crater-free region
in the south.
This false-color view is a composite of individual frames obtained using
filters sensitive to ultraviolet (centered at 338 nanometers), green
(centered at 568 nanometers) and infrared light (centered at 752
nanometers). The view has been enhanced to accentuate subtle color
differences and fine-scale surface features.
The Sun illuminates Enceladus from the lower left, leaving part of the
moon in shadow. This view shows the anti-Saturn hemisphere, centered at
42 degrees south latitude, 167 west longitude.
The images comprising this view were taken with the Cassini spacecraft
narrow-angle camera at a distance of about 112,100 kilometers (69,700
miles) from Enceladus, and at a Sun-Enceladus-spacecraft, or phase, angle
of 46 degrees. The image scale is about 670 meters (2,200 feet) 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.
