Institution: | 1. Qinghai Normal University, Xining 810000, China;2. Purple Mountain Astronomical Observatory, Chinese Academy of Sciences, Nanjing 210008;3. Graduate University of the Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049;4. Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China |