1. Lunar and Planetary Laboratory; University of Arizona; Tucson Arizona 85705 USA
2. NASA Goddard Space Flight Center; Greenbelt Maryland 20771 USA
3. Observatoire de Paris; Paris 75014 France
4. Lockheed Martin Space Systems; Littleton Colorado 80127 USA
5. Massachussets Institute of Technology; Cambridge Massachusetts 02139 USA
6. Southwest Research Institute; Boulder Colorado 80302 USA
7. University of Central Florida; Orlando Florida 32816 USA
8. Jet Propulsion Laboratory; Pasadena California 91109 USA
9. Space Science Institute; Boulder Colorado 80301 USA
10. Ithaca College; Ithaca New York 14850 USA
11. University of Winnipeg; Winnipeg MB R3B 2E9 Canada
12. Kingsborough Community College of CUNY; Brooklyn New York 11235 USA
13. The Graduate Center of CUNY; New York New York 10016 USA
14. AMNH; Central Park West; New York New York 10024 USA
15. Indigo Information Services; Tucson Arizona 84745 USA
16. Lagrange Laboratory; University of Nice-Sophia Antipolis; CNRS, Côte d'Azur Observatory; Nice 06300 France
17. University of Tennessee; Knoxville Tennessee 37996 USA
18. Planetary Science Institute; Tucson Arizona 85719 USA
19. University of British Columbia; Vancouver British Columbia V5Z 1M9 Canada
20. NASA Johnson Space Center; Houston Texas 77058 USA
21. Arecibo Observatory; Arecibo 00612 Puerto Rico
22. NASA Ames Research Center; Mountain View California 94035 USA
23. University of Colorado; Boulder Colorado 80309 USA
24. Institute of Astronomy; Charles University; 116 36 Praha 1 Czech Republic