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These images of Tarpeia crater, near the south pole of the giant asteroid Vesta, were obtained by the visible and infrared mapping spectrometer on NASA's Dawn spacecraft. Colorized versions of the images show younger material with abundant pyroxene (an iron- and magnesium-rich material) and older layers with less pyroxene.
The visible and infrared mapping spectrometer obtained the images during Dawn's survey orbit (1,700 miles or 2,750 kilometers in altitude) on Aug. 21, 2011; high-altitude mapping orbit (420 miles or 680 kilometers above the surface) on Oct. 9, 2011; and low-altitude mapping orbit (130 miles or 210 kilometers in altitude) on Feb. 5, 2012.
In the colorized images, scientists assigned red to the 1.9-micron wavelength of reflected light, green to the 1.5-micron wavelength and blue to the 1.2-micron wavelength. In the resulting image, the brown and yellow materials have similar composition, but the brown material receives less illumination from sunlight and appears darker. The material on the edge of the crater rim that appears blue in these images suggests a different, fresher material. This material must have been exposed during a landslide or a similar recent event that occurred on the side of the crater. Researchers think the blue areas have been less altered over time, preserving more of the original material of Vesta.
The Dawn mission to Vesta and Ceres is managed by NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, for NASA's Science Mission Directorate, Washington. UCLA is responsible for overall Dawn mission science. The Dawn framing cameras were developed and built under the leadership of the Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany, with significant contributions by DLR German Aerospace Center, Institute ofPlanetary Research, Berlin, and in coordination with the Institute of Computer and Communication Network Engineering, Braunschweig. The framing camera project is funded by the Max Planck Society, DLR and NASA/JPL.