A simulation experiment on the GM estimation for Comet 133P/Elst-Pizarro  

作　　者：Wu-Tong Gao Jian-Guo Yan Wei-Tong Jin Xuan Yang Chen Yang Mao Ye Fei Li Jean-Pierre Barriot 

机构地区：[1]l State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China [2]China Academy of Space Technology,Beijing 100094,China [3]Geodesy Observatory of Tahiti,University of French Polynesia,BP 6570,98702 Faaa,Tahiti,French Polynesia

出　　处：《Research in Astronomy and Astrophysics》2021年第1期158-164,共7页天文和天体物理学研究（英文版）

基　　金：the National Natural Science Foundation of China(U1831132 and 41874010);Innovation Group of Natural Fund of Hubei Province(2018CFA087);supported by a DAR fund in planetology from the French Space Agency(CNES)。

摘　　要：In China’s asteroid mission to be launched around 2025,(7968)133 P/Elst-Pizarro(hereafter 133 P)will be the second target,after a visit to asteroid(469219)Kamo’oalewa.This paper describes a simulation of precise orbit determination for the spacecraft around comet 133 P,as well as estimation of its gravitational parameter(GM)value and the solar radiation pressure coefficient Cr for the spacecraft.Different cometocentric distances of 200,150 and 100 km orbits are considered,as well as two tracking modes:exclusive two-way range-rate mode(Earth station to spacecraft)and combinations of two-way range-rate and local spacecraft onboard ranging to the comet.Compared to exclusive two-way range-rate,the introduction of local ranging observables improves the final GM uncertainties by up to one order of magnitude.An ephemeris error in the orbit of 133 P is also considered,and we show that,to obtain a reliable estimate of the GM for 133 P,this error cannot exceed a one km range.

关 键 词：celestial mechanics space vehicles comets:individual(133P/Elst-Pizarro) methods:statistical 

分 类 号：P13[天文地球—天体力学] P185.81[天文地球—天文学]