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

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天文和天体物理学研究:英文版 2023年第9期23卷 129-141页

作者： Shang-Biao Sun Jian-Guo Yan Wu-Tong Gao Bo Wang Zhen Wang Mao Ye Jean-Pierre Barriot State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Geodesy Observatory of Tahiti University of French PolynesiaBP 6570F-98702 FaaaTahitiFrench PolynesiaFrance

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.

关键词： gravitation-methods data analysis-celestial mechanics-comets general

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