¹ Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA
² Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA
³ Lowell Observatory, Flagstaff, AZ 86001, USA
⁴ Astronomy Department, Williams College, Williamstown, MA 01267-2565, USA
⁵ Physics Department, Williams College, Williamstown, MA 01267-2565, USA
⁶ Current address: Department of Aeronautics and Astronautics, Purdue University, West Lafayette, IN 47907, USA
⁷ Department of Astronomy, Boston University, Boston, MA 02215
⁸ School of Mathematics and Physics, University of Tasmania, Hobart, Tasmania 7001, Australia
⁹ Research School of Astronomy and Astrophysics, Australian National University, Mount Stromlo Observatory, Weston, ACT 2611, Australia
¹⁰ Astronomical Society of South Australia, Inc., Adelaide, SA 5001, Australia
¹¹ School of Physics, University of Sydney, NSW 2006, Australia
¹² Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand