Henri Samuel¹, Maxim Ballmer², Attilio Rivoldini³, Sebastiano Padovan⁴, Ana-Catalina Plesa⁴, Nicola Tosi⁴, Francis Nimmo⁵, Doris Breuer⁴, Mark P Panning⁶ and Philippe Henri Lognonné¹, (1)Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France, (2)University College London, ETH Zuerich, London, United Kingdom, (3)Royal Observatory of Belgium, Brussels, Belgium, (4)German Aerospace Center DLR Berlin, Berlin, Germany, (5)University of California-Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States, (6)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States