Browsing University of Hertfordshire by Author "Qi, Zhaoxiang"

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    • ABSOLUTE PROPER MOTIONS OUTSIDE the PLANE (APOP) - A STEP TOWARD the GSC2.4 

      Qi, Zhaoxiang; Yu, Yong; Bucciarelli, Beatrice; Lattanzi, Mario G.; Smart, Richard L.; Spagna, Alessandro; McLean, Brian J.; Tang, Zhenghong; Jones, H.R.A.; Morbidelli, Roberto; Nicastro, Luciano; Vecchiato, Alberto (2015-10-06)
      We present a new catalog of absolute proper motions and updated positions derived from the same Space Telescope Science Institute digitized Schmidt survey plates utilized for the construction of Guide Star Catalog II. As ...

    • Long-term analysis of clear nights using satellite data considering astronomical sites in western China 

      Zihuang, Cao; Qi, Zhaoxiang; Jones, Hugh (2020-06-01)
      A large ground-based optical/infrared telescope is being planned for a world-class astronomical site in China. The cloud-free night percentage is the primary meteorological consideration for evaluating candidate sites. The ...