Working models for the gravitational field of Phobos  

作　　者：SHI Xian WILLNER Konrad OBERST Jürgen PING JinSong YE ShuHua 

机构地区：[1]Shanghai Astronomical Observatory,Chinese Academy ofSciences,Shanghai 200030,China [2]Departmentfor Geodesy and Geoinformation Science,Technical University Berlin,Berlin 10623,Germany [3]Institute of Planetary Research,Planetary Geodesy,German Aerospace Center,Berlin 12489,Germany

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第2期358-364,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the CAS-DAAD joint scholarship,the National Natural Science Foundation of China (Grant No.10973031);the National High Technology Research and Development Program of China (Grant No.2010AA122206);the Ministry of Education and Science of the Russian Federation (Grant NO.11.G34.31.0021)

摘　　要：Models for the gravitational field of Mars moon Phobos were developed using the latest shape model and assuming homogeneous density distribution.Three methods were applied in our study.Comparisons were made between these methods and all were shown to yield consistent results.Notably,the most accurate shape model of Phobos to date,complete up to degree and order 17 was used for the first time in our analysis.A set of spherical harmonic coefficients up to degree and order 17 were derived for the gravitational field of Phobos.Also considered was the gravitational field on the surface of Phobos.Typical characteristics as well as some pronounced surface features of this irregular-shaped small body could be conveniently identified.The results are readily applicable for such purposes as spacecraft orbit analysis and assessing the dynamical environment of Phobos.Models for the gravitational field of Mars moon Phobos were developed using the latest shape model and assuming homogeneous density distribution. Three methods were applied in our study. Comparisons were made between these methods and all were shown to yield consistent results. Notably, the most accurate shape model of Phobos to date, complete up to degree and order 17 was used for the first time in our analysis. A set of spherical harmonic coefficients up to degree and order 17 were derived for the gravitational field of Phobos. Also considered was the gravitational field on the surface of Phobos. Typical characteristics as well as some pronounced surface features of this irregular-shaped small body could be conveniently identi- fied. The results are readily applicable for such purposes as spacecraft orbit analysis and assessing the dynamical environment of Phobos.

关 键 词：PHOBOS gravitational field forward modeling 

分 类 号：P136[天文地球—天体力学] P185.3[天文地球—天文学]