MMX geodesy investigations: science requirements and observation strategy

Earth, Planets and Space

Akito Araya¹  Shunichi Kamata²  Hitoshi Ikeda³  Nicola Baresi⁴  Toru Kouyama⁵  Hiroki Senshu⁶  Koji Matsumoto⁷  Hirotomo Noda⁷  Hiroshi Araki⁸  Keiko Yamamoto⁸  Noriyuki Namiki⁹  Naru Hirata^1,10  Hideaki Miyamoto^1,11 

[1]Earthquake Research Institute, University of Tokyo, 113-0032, Tokyo, Japan

[2]Hokkaido University, 060-0810, Sapporo, Japan

[3]Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 252-0222, Sagamihara, Kanagawa, Japan

[4]Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 252-0222, Sagamihara, Kanagawa, Japan

[5]University of Surrey, GU2 7XH, Guildford, Surrey, UK

[6]National Institute of Advanced Industrial Science and Technology, 305-8560, Tsukuba, Japan

[7]Planetary Exploration Research Center, Chiba Institute of Technology, 275-0016, Tsudanuma, Narashino, Chiba, Japan

[8]RISE Project, National Astronomical Observatory of Japan, 023-0861, Oshu, Iwate, Japan

[9]The Graduate University for Advanced Studies, SOKENDAI, 240-0193, Hayama, Kanagawa, Japan

[10]RISE Project, National Astronomical Observatory of Japan, 181-8588, Mitaka, Tokyo, Japan

[11]The Graduate University for Advanced Studies, SOKENDAI, 240-0193, Hayama, Kanagawa, Japan

[12]RISE Project, National Astronomical Observatory of Japan, 181-8588, Mitaka, Tokyo, Japan

[13]University of Aizu, 965-8580, Aizu-Wakamatsu, Japan

[14]University of Tokyo, 113-0033, Tokyo, Japan

关键词: MMX;    Gravity;    Shape;    Rotation;    Internal structure;   

DOI  :  10.1186/s40623-021-01500-6

来源: Springer

【 摘 要 】

In order to investigate the origin of Phobos and Deimos, the Japanese Martian Moons eXploration (MMX) mission is scheduled for launch in 2024. MMX will make comprehensive remote-sensing measurements of both moons and return regolith samples from Phobos to Earth. Geodetic measurements of gravity, shape, and rotation parameter of a body provides constraints on its internal structure reflecting its origin and evolution. Moments of inertia are important parameters to constrain the internal mass distribution, but they have not been well determined for the Martian moons yet. We discuss the mission requirements related to the moments of inertia to detect a potential heterogeneity of the mass distribution inside Phobos. We introduce mission instruments and operational strategies to meet the mission requirements. We present a preliminary imaging strategy from a quasi-satellite orbit for a base shape model that is expected to be created at the early stage of the mission. Geodetic products including ephemeris, gravity field, rotation parameter of Phobos, and spacecraft orbit are of importance not only for the geodetic study, but also for interpreting data from various mission instruments and selecting possible landing sites.Graphical Abstract

【 授权许可】

CC BY