1. Shandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Institute of Space Sciences, Shandong University , Weihai, Shandong 264209 , China
2. CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101 , China
3. Xinjiang Astronomical Observatory , 150 Science 1-Street, Urumqi 830011 , China
4. Wenzhou Astronomical Association , Beibaixiang Town, Yueqing, Zhejiang 325603 , China