Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p22c..01d&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P22C-01
Mathematics
Logic
5420 Impact Phenomena, Cratering (6022, 8136), 5422 Ices, 5464 Remote Sensing, 5470 Surface Materials And Properties, 6280 Saturnian Satellites
Scientific paper
On September 10, 2007, the first and sole targeted Iapetus flyby of the Cassini spacecraft within six years took place (5 days after submission of this abstract). The inbound imaging plan covered the crescent over the leading side down to 480 m/pxl (at 145 deg phase angle). Within the time frame between closest approach (C/A) minus 5:25 hrs and C/A+5:44 hrs, observations of the dark/bright transition zone, the ridge, and a large (~500 km) basin on the trailing side were in the plan. From C/A-55 min to +180 min, the top-priority observation contained 11 different targets on the surface, including high-phase observations of the dark ridge (~30 m/pxl, 140W longitude), 10 m/pxl samples of the dark terrain, two large transition zone mosaics over the anti-Saturn hemisphere, and high-res. imaging (~50 m/pxl) of the bright "Voyager mountains". Outbound observations included a global, 15- panel mosaic of the complete trailing hemisphere (~450 m/pxl), as well as multiple regional color panels and a global color observation at 1.6 km/pxl and 34 deg phase. Imaging data will hopefully help to give answers to questions like: What is the cratering record at Iapetus? How old is the surface? Might Iapetus indeed act as a reference point for surface age determinations in the whole Saturn system? What about the huge basins? How did the ridge form? Are there more geologic features than the craters and the ridge, especially at smaller scales? How is the dark and bright material distributed? Are there more than two kinds of dark material? How thick is the dark blanket, and might we even see bright holes deep within the dark terrain? Why is Iapetus' shape not spherical? What are the implications of the global color dichotomy? Etcetc... And, most important: What causes the extreme brightness dichotomy already recognized by J.-D. Cassini 335 years ago?
Cassini Team
Denk Tilmann
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