Ceri Nunn¹, William T Pike², Simon B Calcutt³, Ian M Standley⁴, Sharon Kedar¹, Renee C Weber⁵, Clive Robert Neal⁶ and Mark P Panning¹, (1)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, (2)Imperial College London, London, SW7, United Kingdom, (3)University of Oxford, Oxford, United Kingdom, (4)Kinemetrics Inc, Pasadena, CA, United States, (5)NASA Marshall Space Flight Center, Huntsville, AL, United States, (6)University of Notre Dame, Notre Dame, IN, United States