Global Topography of Enceladus: Additional Evidence for a Thin shell, and New Evidence for Regional Shell Density Variations

William B McKinnon, Washington University in St Louis, St. Louis, MO, United States, Paul Schenk, Lunar and Planetary Institute, USRA, Houston, TX, United States, Michael T Bland, USGS Astrogeology Science Center, Flagstaff, AZ, United States and David P Mayer, United States Geological Survey, Astrogeology Science Center, Flagstaff, AZ, United States