1. Department of Physics & Astronomy, University of California Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095, USA
2. Central Astronomical Observatory, Russian Academy of Sciences, 65/1 Pulkovskoye chaussee, St Petersburg 196140, Russia
3. Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut, D-69120 Heidelberg, Germany
4. Department of Astronomy, University of Texas at Austin, 2515 Speedway, Mail Stop C1400, Austin, TX 78712, USA
5. Department of Physics, University of Arkansas, 825 West Dickson Street, Fayetteville, AR 72701, USA
6. Wise Observatory, Tel Aviv University, 69978 Tel Aviv, Israel
7. Department of Physics & Astronomy, University of California Riverside, Riverside, CA 92521, USA
8. Department of Physics & Astronomy, University of California, Irvine, 4129 Frederick Reines Hall, Irvine, CA 92697, USA
9. Department of Physics, Ludwig-Maximillians Universitat München, Schellingstrasse 4, D-80799 Munich, Germany
10. Department of Physics, University of Surrey, Surrey GU2 7XH, UK
11. Griffith Observatory, 2800 East Observatory Road, Los Angeles, CA 90027, USA
12. Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
13. Department of Earth, Planetary & Space Sciences, 595 Charles Young Drive, University of California Los Angeles, CA 90095, USA
14. NASA Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
15. Department of Physics, The College of Wooster, 308 E. University Street, Wooster OH 44691, USA