Evolution of e, i, q, and Q for a 0.2 μm impactor from initial retrograde orbit, where e, i, q, and Q denote the eccentricity, the inclination, the perigee, and the apogee of the particle, which are measured in the geocentric lunar orbital frame. The dashed lines denote the time at which the particle leaves the Moon’s Hill sphere. Panel a: evolution of e. Panel b: evolution of i. Panel c: evolution of q and Q.