1. Center for Space Sciences and Technology University of Maryland Baltimore MD USA
2. NASA Goddard Space Flight Center Greenbelt MD USA
3. Center for Research and Exploration in Space Science and Technology (CRESST) II NASA/GSFC Greenbelt MD USA
4. Now at Planetary Geology, Geophysics, and Geochemistry Laboratory NASA Goddard Space Flight Center Greenbelt MD USA
5. Faculty of Aerospace Engineering Delft University of Technology Delft The Netherlands
6. Now at Faculty of Mathematics and Computer Science University of Barcelona Barcelona Spain
7. Now at The Colorado Center for Astrodynamics Research and the Earth Science and Observation Center of the Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder CO USA