James H Roberts¹, Olivier S Barnouin¹, Catherine Johnson², Michael G Daly³, Mark Perry⁴, R. Terik Daly⁵, Manar Al Asad², Eric E Palmer⁶, John R Weirich⁶, Patrick Michel⁷, William F Bottke Jr⁸, Kevin John Walsh⁹, Michael C Nolan¹⁰, Daniel Jay Scheeres¹¹, Jay McMahon¹², Gregory A Neumann¹³ and Dante S Lauretta¹⁴, (1)JHU Applied Physics Lab, Laurel, MD, United States, (2)University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada, (3)York University, Centre for Research in Earth and Space Science, Toronto, ON, Canada, (4)JHU Applied Physics Lab, Laurel, United States, (5)Johns Hopkins University Applied Physics Laboratory, Laurel, United States, (6)Planetary Science Institute, Tucson, AZ, United States, (7)UNS-CNRS-Observatoire de la Cote d'Azur, Laboratoire Lagrange, NIce, France, (8)Southwest Research Institute Boulder, Solar System Exploration Research Virtual Institute, Institute for the Science of Exploration Targets, Boulder, CO, United States, (9)Southwest Research Institute Boulder, Boulder, United States, (10)Arecibo Observatory, Arecibo, PR, United States, (11)University of Colorado Boulder, Ann and H.J. Smead Department of Aerospace Engineering Sciences, Boulder, CO, United States, (12)University of Colorado at Boulder, Ann and H.J. Smead Department of Aerospace Engineering Sciences, Boulder, CO, United States, (13)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (14)University of Arizona, Lunar and Planetary Laboratory, Tucson, AZ, United States