Purple Mountain Observatory Nanjing 210008 China;
Purple Mountain Observatory Nanjing 210008 China;
Purple Mountain Observatory Nanjing 210008 China;
Purple Mountain Observatory Nanjing 210008 China;
Purple Mountain Observatory Nanjing 210008 China;
Nanjing Institute of Astronomical Optics & Technology Nanjing 210042 China;
Nanjing Institute of Astronomical Optics & Technology Nanjing 210042 China;
Purple Mountain Observatory Nanjing 210008 China;
Purple Mountain Observatory Nanjing 210008 China;
National Astronomical Observatories of China Beijing 100012 China;
National Astronomical Observatories of China Beijing 100012 China;
Purple Mountain Observatory Nanjing 210008 China;