SUN, Vivian, Jet Propulsion Laboratory, 4800 Oak Grove Drive, M/S 183-301, Pasadena, CA 91109 and STACK, Kathryn M., Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109
HANLEY, Jennifer, Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ 86001, HORGAN, Briony, Purdue University, West Lafayette, IN 47907 and CHAVES, L.C., Universidad Nacional de Colombia, Bogota, Colombia