1 MUltiplexed Survey Telescope (MUST) Project Collaboration, Tsinghua University, Beijing 100084, China
2 Center for Astronomy Technology, Tsinghua University, Beijing 100084, China
3 Department of Precision Instrument, Tsinghua University, Beijing 100084, China
4 Department of Astronomy, Tsinghua University, Beijing 100084, China
5 Carnegie Institution of Washington, The Carnegie Observatories, Pasadena, CA 91101, USA
6 School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China
7 Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China