Media Information
 
 
 
Collection:
NASA Planetary Photo Journal Collection
Title:
Rhea's Wisps in Color
Original Caption Released with Image:
Bright, wispy markings stretch across a region of darker terrain on Saturn's moon Rhea. In this extreme false-color view, the roughly north-south fractures occur within strips of material (which appear greenish here) that are a different color from the surrounding cratered landscape.

To create the false-color view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional color differences. Most of the large-scale variations in brightness across the surface are removed by this process. This "color map" was then superimposed over a clear-filter image.

The origin of the color differences is not yet understood, but it may be caused by subtle differences in the surface composition or grain sizes making up the icy soil.

Wispy markings were seen on the trailing hemispheres of both Rhea and Dione in images taken by NASA's Voyager spacecraft, and were hypothesized by some researchers to be the result of material extruded onto the surface by ice volcanism. Cassini's earlier revelation of the braided fractures on Dione led to speculation that Rhea's wisps might also be created by fractures.

This view shows terrain on the trailing hemisphere of Rhea (1,528 kilometers, or 949 miles across). North is up.

The image was taken using the Cassini spacecraft narrow-angle camera on Jan. 17, 2006, at a distance of approximately 245,000 kilometers (152,000 miles) from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 30 degrees. Image scale is 1 kilometer (4,771 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 operations center is based at the Space Science Institute in Boulder, Colo.

For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov/home/index.cfm. The Cassini imaging team homepage is at http://ciclops.org.
Image Credit:
NASA/JPL/Space Science Institute
Produced By:
Cassini Imaging Team
Mission:
Cassini
Spacecraft:
Cassini Orbiter
Target Name:
Rhea
Is a satellite of:
Saturn
Instrument:
Imaging Science Subsystem - Narrow Angle
Product Size:
1124 samples x 1124 lines
Primary Data Set:
Cassini
facet_what:
Sun
facet_what:
Moon
facet_what:
Voyager
facet_what:
Rhea
facet_what:
Dione
facet_what:
Saturn
facet_what:
Cassini
facet_what:
Cassini Orbiter
facet_what:
Huygens Probe
facet_what:
Cassini-Huygens
facet_what:
Imaging Science Subsystem (ISS)
facet_what:
Rhea (Saturn Moon)
facet_where:
Jet Propulsion Laboratory
facet_where:
Rhea
facet_where:
Dione
facet_where:
Saturn
facet_where:
California
facet_where:
Washington
facet_where:
Jet Propulsion Laboratory (JPL)
facet_where:
Washington, D.C.
Image #:
PIA08120
UID:
SPD-PHOTJ-PIA08120
orignial url:
http://photojournal…

Rhea's Wisps in Color
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