MISSION. D.A. Williams, S.C. Mest, T. Kneissl, J.H. Pasckert, H. Hiesinger, N. Schmedemann, A. Neesemann, D.L. Buczkowski, J.E.C. Scully, S. Marchi, P. Schenk, R. Jaumann, T. Roatsch, F. Preusker, A. Nathues, M. Schäfer, M. Hoffmann, C.A. Raymond, C.T. Russell. School of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ 85287 (David.Williams@asu.edu); Planetary Science Institute, Tucson, AZ; Freie Universität, Berlin, Germany; Institut für Planetologie, Westfälische Wilhelms-Universität, Münster, Germany; Johns Hopkins University Applied Physics Laboratory, Laurel, MD; NASA JPL, California Institute of Technology, Pasadena, CA; Southwest Research Institute, Boulder, CO; Lunar and Planetary Institute, Houston, TX; German Aerospace Center (DLR), Berlin, Germany; Max Planck Inst. for Solar System Research, Göttingen, Germany; UCLA, Los Angeles, CA.