Fig. 3From: Martian moons exploration MMX: sample return mission to Phobos elucidating formation processes of habitable planetsPlanned observational orbits around Phobos. Quasi-satellites orbits (QSOs) are drawn in the Phobos fixed frame with Phobos at the center taking the xy-plane and the x-axis direction to be the Phobos orbital plane and the opposite direction to Mars, respectively. Top: QSOs confined in the xy-plane. Bottom: An example of 3D-QSO trajectory for the case taking effective orbital radius same as QSO-M and inclination of 45°Back to article page