1. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822
2. Department of Geosciences, San Francisco State University, San Francisco, CA 94132, and NASA Ames Research Center, Space Sciences Division, Moffett Field, CA 94035-1000
3. NASA Ames Research Center, Space Sciences Divisiol, Moffett Field, CA 94035-1000
4. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139
5. Observatoire de Paris, 92195 Meudon Cedex, France
6. Joint Astronomy Centre, Hilo, HI 96720
7. Jet Propulsion Laboratory, Pasadena, CA 91109
8. Sterling Software, Inc., NASA Ames Research Center, Moffett Field, CA 94035-1000