Institution: | a Planetary Astronomy Group, Astromaterials Research and Exploration Science, NASA Johnson Space Center, Mail Code KR, Houston, TX 77058-3696, USA b Institute for Astronomy, University of Hawai'i, Honolulu, HI 96822, USA c Astronomical Institute, Academy of Sciences of the Czech Republic, CZ-25165, Ond?ejov, Czech Republic d Department of Physics, Illinois Wesleyan University, Bloomington, IL 61702, USA e Department of Astronomy, University of Maryland, College Park, MD 20742, USA f Department of Space Studies, University of North Dakota, Grand Forks, ND 58202, USA g Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA |