ZHANG Hui-yan1,2,3, CHENG Xuan1,2,3, PAN Qing-gui1,2,3,

JING Yue-juan1,2,3, QIAO Rong-chuan1,2

(1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China;

2. Key laboratory of Precision Navigation and Timing Technology, Chinese Academy of Sciences, Xi’an 710600, China;

3. Graduate University of Chinese Academy of Science, Beijing 100039, China)

Abstract: In July 2009, observations of mutual eclipses and occultations of Galileo satellites of Jupiter were made at the South Tianchi station of Shanghai Observatory.By using the photometric CCD images obtained from these observations and analyzing the data, we determined the beginning and end times, as well as the midlight time when the light flux of the eclipsed satellite (Ganymede) dropped to the minimum during the event.

Key words: Galileo satellites; mutual events; photometry