Glenn S Orton, Jet Propulsion Laboratory, Pasadena, CA, United States, F. Tabataba-Vakili, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, Spain, G. Eichstädt, Independent scholar, Stuttgart, Germany, Candice J. Hansen, Planetary Science Institute, Tucson, AZ, United States, Thomas Momary, NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, John Rogers, British Astronomical Association, London, United Kingdom, Andrew P. Ingersoll, California Institute of Technology, Pasadena, CA, United States and Hamish Nicholson, Harvard University, Harvard College, Cambridge, MA, United States