1. Department of Physics and Astronomy , N283 ESC, Brigham Young University, Provo, UT 84602 , USA
2. Central (Pulkovo) Astronomical Observatory, Russian Academy of Sciences , Pulkovskoye Chaussee 65/1, St Petersburg 196140 , Russia
3. Department of Physics and Astronomy, University of California , Los Angeles, CA 90095 , USA
4. Arkansas Center for Space and Planetary Sciences, University of Arkansas , Fayetteville, AR 72701 , USA
5. Department of Physics, University of Arkansas , Fayetteville, AR 72701 , USA
6. Department of Physics and Astronomy, Johns Hopkins University , 3400 N. Charles Street, Baltimore, MD 21218 , USA
7. Saint Petersburg State University , Universitetskij pr. 28, St. Petersburg 198504 , Russia
8. The Wise Observatory and the Raymond and Beverly Sackler School of Physics and Astronomy, The Faculty of Exact Sciences , Tel Aviv University, Tel Aviv 69978 , Israel
9. Lowell Observatory , Flagstaff, AZ 86001 , USA
10. Department of Physics, University of California , Davis, CA 95616 , USA
11. University of California , Los Angeles, CA 90024 , USA
12. Zentrum für Astronomie der Universität Heidelberg , Astronomisches Rechen-Institut, Mönchhofstr. 12, D-69120 Heidelberg , Germany
13. Department of Physics and Astronomy, Georgia Southern University , GA 30458 , USA