Simulated Gravity Field Estimation for the Main Belt Comet 133P/Elst-Pizarro Based on a Satellite-to-satellite Tracking Mode

作     者：Shang-Biao Sun Jian-Guo Yan Wu-Tong Gao Bo Wang Zhen Wang Mao Ye Jean-Pierre Barriot Shang-Biao Sun;Jian-Guo Yan;Wu-Tong Gao;Bo Wang;Zhen Wang;Mao Ye;Jean-Pierre Barriot

作者机构：State Key Laboratory of Information Engineering in SurveyingMapping and Remote SensingWuhan UniversityWuhan 430079China Xinjiang Astronomical ObservatoryChinese Academy of SciencesUrumqi 830011China Geodesy Observatory of TahitiUniversity of French PolynesiaBP 6570F-98702 FaaaTahitiFrench PolynesiaFrance 

出 版 物：《天文和天体物理学研究:英文版》 (Research in Astronomy and Astrophysics)

年 卷 期：2023年第23卷第9期

页      面：129-141页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China (42241116 and U1831132) supported by the Macao Science and Technology Development Fund (No. SKL-LPS(MUST)-20212023) the 2022 Project of Xinjiang Uygur Autonomous Region of China for Heaven Lake Talent Program supported by the Chinese Academy of Sciences Foundation of the young scholars of western (2020-XBQNXZ-019) supported by a DAR grant in planetology from the French Space Agency (CNES) 

主　　题：gravitation-methods data analysis-celestial mechanics-comets general 

摘      要：Most asteroids and comets are formed in the early stages of the solar system and therefore contain a wealth of information about their *** asteroid exploration mission planned in the coming years by China will likely target the celestial body named 133P/Elst-Pizarro(estimated diameter of about 4 km).The orbit of this asteroid stays within the asteroid belt,but nevertheless,it displays a comet-like dust *** this study,we used differential tracking data between two simulated probes and the data from an Earth station to estimate 133P gravity field *** observation mode is similar to how the gravity field was estimated for large celestial objects in the GRAIL and GRACE missions,but here the object is the very small 133P *** compared the estimated gravity fields obtained for 133P from the satellite-to-satellite combined with the Earth-based two-way range-rate observation mode,with only the Earth-based two-way range rate *** results show that the accuracy of the low-degree(4 degree and order)estimate of the gravity field is improved by one order of magnitude by using the satellite-to-satellite combined with the Earth-based two-way range-rate observation mode with respect to the Earthonly ***,another order of magnitude improvement in the gravity field solution is gained by decreasing the orbit altitude from 12 to 8 km.