Mark P Panning¹, Ralph D Lorenz², Simon C Staehler³, Elizabeth P Turtle⁴, Terry Hurford Jr⁵, Naomi Murdoch⁶ and Steven Vance¹, (1)Jet Propulsion Laboratory, Pasadena, CA, United States, (2)JHU / APL, Laurel, MD, United States, (3)ETH Zurich, Institute of Geophysics, Zurich, Switzerland, (4)JHU Applied Physics Lab., Laurel, MD, United States, (5)NASA Goddard Space Flight Center, Planetary Geology, Geophysics & Geochemistry Laboratory, Code 698, Greenbelt, MD, United States, (6)Institut Superieur de l’Aeronautique et de l’Espace, Toulouse, France