Two images from CRISM presenting three of the recorded wavelengths are online at:

http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA15291

Comet Siding Spring -- an Oort Cloud comet that may contain material from the formation of the solar system some 4.6 billion years ago -- was making its first voyage through the inner solar system. CRISM and many other instruments and spacecraft combined forces to provide an unprecedented data set for an Oort Cloud comet.

The appearance of color variations in the CRISM observations of the inner coma could be due to the properties of the comet's dust, possibly dust grain size or composition. The full spectra will be analyzed to better understand the reason for the color variations.

The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, provided and operates CRISM. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate in Washington. Lockheed Martin Space Systems in Denver built the orbiter.

For more about CRISM, visit: http://crism.jhuapl.edu/

For more about Mars Reconnaissance Orbiter, visit: http://mars.nasa.gov/mro/

For more about comet Siding Spring, including other images of the comet, visit: http://mars.jpl.nasa.gov/comets/sidingspring/