Mathematics – Logic
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1801s&link_type=abstract
American Astronomical Society, DPS meeting #38, #18.01; Bulletin of the American Astronomical Society, Vol. 38, p.513
Mathematics
Logic
Scientific paper
Geologic and Cratering History of Enceladus
We have begun global geologic mapping of Enceladus using controlled global Cassini image mosaics. Geologic mapping and crater counting shows at least 4 and possibly 6 episodes of resurfacing, including the current resurfacing near the south pole. The oldest recognized terrain has crater densities similar to Ganymede's bright terrain, except that the shape of the SFD is distinctly different. There appears to be a depletion of smaller craters relative to our high resolution crater counts of Ganymede. Northern cratered plains also appear to have higher crater densities than southern cratered plains. This may or may not relate to an ancient episode of tectonism in southern and equatorial regions. We detect no obvious record of apex cratering asymmetries or direct evidence for reorientation (at least as of this writing). Other counts are incomplete as yet but will be used to compare the SFD over time in the Saturn system. Detailed topographic mapping in progress also shows some unexpected variations in topography, perhaps unrelated to geologic units.
Schenk Paul
Seddio S.
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