ORBITAL MAPPING. Frank Preusker, Jürgen Oberst, David T. Blewett, Klaus Gwinner, James W. Head, Scott L. Murchie, Mark S. Robinson, Thomas R. Watters, Maria T. Zuber, and Sean C. Solomon. German Aerospace Center, Institute of Planetary Research, D-12489 Berlin, Germany (Frank.Preusker@dlr.de); The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA; Department of Geological Sciences, Brown University, Providence, RI 02912, USA; School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA; Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA; Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA.