Marc A Hesse, University of Texas at Austin, Geological Sciences, Austin, TX, United States, Jennifer E. C. Scully, University of California Los Angeles, Los Angeles, CA, United States, Julie C Castillo-Rogez, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States and Carol A Raymond, NASA Jet Propulsion Laboratory, Pasadena, CA, United States