1. Department of Astronomy University of Maryland College Park MD USA
2. Planetary Geology, Geophysics, and Geochemistry Laboratory National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt MD USA
3. Center for Research and Exploration in Space Science and Technology NASA/GSFC Greenbelt MD USA
4. Department of Geology University of Maryland College Park MD USA
5. School of Geosciences University of South Florida Tampa FL USA