Preliminarily study of Saturn’s upper atmosphere density by observing Cassini plunging via China’s deep space station  

作　　者：Lue Chen Jin-Song Ping Xiang Liu Na Wang Jian-Feng Cao Guang-Ming Chen Ming-Yuan Wang Wen-Xiao Li Jian-Hui Zhang Yong-Qiang Chen Shi-Lei Yue Song-Tao Han Jing Sun 

机构地区：[1]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [2]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Beijing Aerospace Control Center,Beijing 100094,China [5]Xi’an Satellite Control Center,Xi’an 710043,China

出　　处：《Research in Astronomy and Astrophysics》2020年第7期112-116,共5页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41874183 and 11603001)。

摘　　要：When the Cassini spacecraft finally plunged into the Saturnian atmosphere on 2017 September15,China’s deep space telescope pointed to Saturn to observe Cassini and study the Saturnian upper neutral atmosphere.In this first Chinese Saturnian radio science experiment,X band Doppler velocity radio science data between the deep space telescope and the Cassini spacecraft were obtained.After removing Saturnian and solar gravity effects,Earth rotation effect,the remaining Saturnian atmosphere drag information was retrieved in the Cassini final plunge progress.Saturn’s upper neutral atmosphere mass density profile is approximately estimated based on atmosphere mass density derived principally by real orbit measurement data.Saturn’s upper neutral atmosphere mass density from 76000 km to 1400 km is estimated from the orbit measurement data,the mass density results are about from 1.4×10^-15 kg cm^-3 to 2.5×10^-14 kg cm^-3.

关 键 词：CASSINI SATURN Doppler velocity neutral atmosphere mass density 

分 类 号：V476.4[航空宇航科学与技术—飞行器设计] P185.3[天文地球—天文学]