1. Planetary Research Group, Department of Marine, Earth, and Atmospheric Sciences; North Carolina State University at Raleigh; Raleigh North Carolina USA
2. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington District of Columbia USA
3. Solar System Exploration Division; NASA Goddard Space Flight Center; Greenbelt Maryland USA
4. Department of Astronomy; Mount Holyoke College; South Hadley Massachusetts USA
5. Department of Space Studies; Southwest Research Institute; Boulder Colorado USA
6. The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
7. Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA
8. Department of Geology; University of Georgia; Athens Georgia USA
9. Center for Earth and Planetary Studies; Smithsonian National Air and Space Museum; Washington District of Columbia USA
10. Planetary Science Institute; Tucson Arizona USA
11. Department of Earth, Environmental and Planetary Sciences; Brown University; Providence Rhode Island USA