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This paper presents a quantitative study of the evolution of the ejecta cloudreleased from a hypervelocity impact on a binary asteroid. We performednumerical simulations of the post-impact dynamics of the ejecta cloud in theframework of the current mission scenario of AIDA mission project. A gridsearch of launching sites of ejecta was defined over the globe of Didymoon, andconsidering a wide range of possible ejection speeds, we determined thedependency of ejecta fate on launching sites (projectile impact sites) andspeeds. This range allows us to track all the complex cases that includedifferent types of dynamical fates. Two major mechanisms are found to beworking broadly during the post-ejection evolution of the ejecta cloud: 1)ejecta on mean motion resonance orbits with Didymoon produce long-termquasi-periodic showers onto Didymoon over at least a couple of weeks after theprojectile impact, 2) ejecta on non-resonant orbits produce a rapid and highre-accretion flux. This rapid and high flux occurs just once because ejecta onsuch orbits leave the system unless they experience a collision during theirfirst encounter. For the second part of this study, we performed full-scalesimulations of the ejecta cloud released from 6 hypothetical impact sites. Weconsidered two kinds of material composing Didymoon's subsurface and thencombined a power-law size distribution of the ejecta with an ejection speeddistribution. We find that the ejecta cloud evolution can be divided in twoperiods. It starts with a first violent period (<10 hr) with fast re-accretionor ejection from the system. A second period is found to be more sensitive tothe launching site than the first one. During this second period, ejecta willeither re-accrete or being ejected from the system, depending both on theirsizes and on their average survival time in close proximity of the binarycomponents.

Ejecta cloud from the AIDA space project kinetic impact on the secondary of a binary asteroid: II. fates and evolutionary dependencies