Time evolution of the Chang’e 5 T1 spacecraft’s mass (a), orbit inclination (b), and eccentricity (c). The green shaded areas in this graph indicate the trajectory-correction maneuvers. At the beginning the maneuvers are frequentwith abrupt mass losses, after which the mass change slowly. The inclination oscillates between 18 and 68 degrees, which is different from the Chang’e 1 probe (from 87 to 91 degrees). The eccentricity evolution is small (below 0.05) in the orbiting period, and a stable orbit is maintained.