1. Center for Planetary Science, Niels Bohr Institute for Astronomy, Physics and Geophysics; University of Copenhagen; Copenhagen Denmark
2. Department of Physics and Astronomy; University of Århus; Århus Denmark
3. Department of Earth Sciences; University of Århus; Århus Denmark
4. Center for Radiophysics and Space Research, Astronomy Department; Cornell University; Ithaca USA
5. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
6. Honeybee Robotics; New York USA