1. Subaru Telescope, National Astronomical Observatory of Japan, 650 N Aohoku Pl, Hilo, HI 96720, USA
2. U.S. Naval Observatory (USNO), 3450 Massachusetts Avenue NW, Washington, DC 20392, USA
3. Department of Physics, University of California, Davis, CA 95616, USA
4. Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
5. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 410007, India