TY - THES ID - 146388256 TI - Master thesis and internship[BR]- Master's Thesis : Robustness and Maintenance of Quasi-Satellite Orbits around Phobos[BR]- Internship (linked to master's thesis) AU - García Mateas, Jose Carlos AU - Kerschen, Gaëtan AU - Rauw, Grégor AU - Leclère, Nicolas AU - Dell'Elce, Lamberto PY - 2020 PB - Liège Université de Liège (ULiège) DB - UniCat KW - Phobos, MMX mission, Quasi-Satellite Orbits, Perturbations, Spherical Harmonics KW - Ingénierie, informatique & technologie > Ingénierie aérospatiale UR - https://www.unicat.be/uniCat?func=search&query=sysid:146388256 AB - The Martian moons pose one of the many unanswered questions regarding the bodies found in the Solar System. As a result, the Japanese Space Agency is developing the so-called Martian Moons eXploration mission (MMX) with the objective of landing in Phobos to retrieve a sample and bring it back to Earth. To land, the spacecraft must first orbit around the moon, where a very rich and complex dynamical environment with several perturbing accelerations is found. This thesis has therefore focused on developing a high precission orbital propagator for the MMX mission. To that end, a spherical harmonics model for the gravity of Mars, a constant density polyhedron for Phobos, solar radiation pressure and sun gravity have been taken into account, and the effect of these perturbations has been studied for a low-altitude Quasi-Satellite Orbit. ER -