Steve Vance, Jet Propulsion Laboratory, Pasadena, CA, United States, Bruce G Bills, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, Christophe Sotin, NASA Jet Propulsion Laboratory, Pasadena, CA, United States, Baptiste Journaux, University of Washington, Earth and Space Sciences, Seattle, WA, United States, J Michael Brown, University of Washington Seattle Campus, Seattle, WA, United States and Krista Marie Soderlund, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States