Alessandro Mura¹, Rosaly M C Lopes², Scott J Bolton³, Anton Ermakov⁴, James Tuttle Keane⁵, Federico Tosi⁶, Francesca Zambon¹, Roberto Sordini⁷, Jani Radebaugh⁸, Julie A Rathbun⁹, William B McKinnon¹⁰, Sander J Goossens¹¹, Matteo Paris¹, Giuseppe Piccioni¹, Christina Plainaki¹² and Giuseppe Sindoni¹³, (1)IAPS-INAF, Rome, Italy, (2)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, (3)Southwest Research Institute, San Antonio, United States, (4)University of California, Berkeley, Space Sciences Laboratory, Berkeley, United States, (5)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, United States, (6)INAF, IAPS, Rome, Italy, (7)INAF, Rome, Italy, (8)Brigham Young University, Provo, UT, United States, (9)Univ of Redlands, Physics Dept, Redlands, CA, United States, (10)Washington University in Saint Louis, Saint Louis, United States, (11)NASA GSFC, Greenbelt, United States, (12)ASI, Rome, Italy, (13)Italian Space Agency, Rome, Italy