Mathematics – Logic
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0916s&link_type=abstract
American Astronomical Society, DPS meeting #42, #9.16
Mathematics
Logic
Scientific paper
Cassini stereo coverage of Saturn's 6 largest midsized icy satellites has been used to produce the first global topographic maps of major icy bodies. All except Iapetus have dynamic topography of -5 to +5 km (excepting the largest basins). Apparently all except Iapetus have been topographically reset by global heating events capable of erasing or preventing the 10's of kilometers of regional relief observed on that outer moon. In contrast to Tethys, Dione features no deep large basins and exhibits lower relief generally, and extensive crater relaxation specifically. Apparently Dione remained hot even longer than Tethys, despite geologic and topographic evidence for smooth volcanic-style plains and tectonic disruption on both satellites. No deep basins are evident on Rhea either. On Rhea, the leading side features a generally much smoother texture at length-scales of 100 km than does the (faulted) trailing hemisphere, suggesting that the leading hemisphere also experienced more pervasive heating than the trailing. On Mimas, an irregular region near the antipode to Herschel exhibits lower crater depths than elsewhere, a possible signature of seismic focusing of the type seen on Mercury. Basin disruption effects appear to be limited. The most prominent occur around Evander (Dione) and southeast of Odysseus (Tethys) , where radial "gouge” erased the preexisting cratering record in favor of much smaller densely packed craters in an annulus around the basin which terminates at a circumferential ridge up to 2 km high! This may be a ring structure or distal ejecta ridge. Radial grooves may also occur near ancient relaxed basins on Dione and Rhea. Grooves 2-3 km deep on Mimas extend nearly globally but their relationship to Herschel is uncertain. Enceladus topography is dominated by pervasive resurfacing and by large-scale depressions (or dimples) that are plausibly due to isostatic variations in shell thickness.
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