MMX geodesy investigations: science requirements and observation strategy

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.

Automated summary

The Japanese MMX mission, scheduled for launch in 2024, aims to investigate the origin of Phobos and Deimos, conduct comprehensive remote-sensing measurements, and return regolith samples from Phobos. Geodetic measurements of gravity, shape, and rotation parameter provide constraints on the internal structure, with mission instruments and operational strategies key to meeting the mission requirements.A preliminary imaging strategy from a quasi-satellite orbit is expected to create a base shape model in the early stage of the mission, with geodetic products playing a crucial role in interpreting data from various mission instruments and selecting possible landing sites.