1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
2. Astronomy Department, University of Maryland, College Park, MD 20742, USA.
3. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
4. Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
5. Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ 8601 1, USA.
6. Steward Observatory, University of Arizona, Tucson, AZ 85721, USA.
7. Lunar and Planetary Laboratory, University of Arizona, Tuscon, AZ 85721, USA.
8. Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA.
9. Department of Physics and Astronomy, University College, London WC1 E 6BT, UK.
10. Space Telescope Science Institute, Baltimore, MD 21218, USA.
11. NASA Ames Research Center, Moffet Field, CA 94053, USA.
12. Five College Astronomy Department, University of Massachusetts, Amherst, MA 01003, USA.
13. Department of Astronomy, University of Texas, Austin, TX 78712, USA.
14. Pennsylvania State University, Erie, PA 16563, USA.
15. Trinity Hall, Cambridge CB2 1TJ, UK.
16. Department of Physics, St. Andrews University, Fife, Scotland.
17. National Air and Space Museum, Washington, DC 20560, USA.
18. Smithsonian Astrophysical Observatory, Cambridge, MA 02138, USA.
19. Department of Mechanical Engineering and Design, Stanford University, Stanford, CA 94305, USA.
20. Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA.
21. Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA.
22. University of California, Los Angeles, CA 90024, USA.
23. Department of Physics and Astronomy, Leicester University, Leicester LE1 7RH, UK.
24. California Institute of Technology, Pasadena, CA 91126, USA.
25. Imperial College of Science, Technology, and Medicine, London SW7 2BZ, UK.