Evidence for Surface Variegation in Rosetta OSIRIS Images of Asteroid 2867 Steins

H. Sierks; H.U. Keller; P. Gutierrez; R. Kramm; S.E. Schr\"oder; S.F. Hviid; W. Sabolo

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Evidence for Surface Variegation in Rosetta OSIRIS Images of Asteroid 2867 Steins

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arxiv 1702.00184 v1 pith:JUDNERGF submitted 2017-02-01 astro-ph.EP

S.E. Schröder , H.U. Keller , P. Gutierrez , S.F. Hviid , R. Kramm , W. Sabolo , H. Sierks This is my paper

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keywords imagesasteroidsteinsosirisrosettasurfacevariegationacquired

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The OSIRIS camera onboard Rosetta successfully acquired images of asteroid 2867 Steins through a variety of color filters during the flyby on 5 September 2008. The best images of this 5 km diameter asteroid have a resolution of 78 meters per pixel. We process the images by deconvolving with the point spread function and enlarging through the Mitchell-Netravali filter. The enhanced set is analyzed by means of various techniques (PCA, band ratios, stereo anaglyphs) to study surface morphology and search for variegation. We identify a landslide, which supports a YORP origin for Steins' unusual diamond shape. In addition, we find that the interior of one of two large craters on the south pole is bluer than the rest of the body.

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