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Study of the kinetic Impactor technique for deflection asteroids on Earth crossing trajectories in the context of the AIDA-Missions DART & Hera Numerical Modelling of Impacts with the iSALE Hydrocode Research Simulation of asteroid entries into the atmosphere and estimate of effects observalbe on the ground (shock wave, light radiation) Research Assistant in the group of Impact and Meteorite Research Subjects: Earth and Planetary Astrophysics (astro-ph.EP)Ĭite as: arXiv:2105.01474 (or arXiv:2105.Museum für Naturkunde Leibniz-Institut für Evolutions- und Biodiversitätsforschung Invalidenstraße 43 10115 Berlin Deutschland The results presented here represent the basis for an empirical scaling relationship for oblique impacts and can be used as a framework to determine an analytical approximation of the vertical component of the ejecta momentum, β−1, given known target properties. The simulation results presented in this paper can help constrain target properties from the DART crater ejecta cone, which will be imaged by the LICIACube. While the ejection angle is relatively insensitive to the target porosity, it varies by up to 30∘ with target coefficient of internal friction. iSALE-2D simulations of vertical impacts provide context for the iSALE-3D simulation results and show that the ejection angle varies with both target properties and with crater growth. The direction of the ejected momentum is not normal to the surface, however it is observed to `straighten up’ with crater growth. It is expected that the momentum imparted from a 45∘ impact is reduced by up to 50\% compared to a vertical impact. We computed iSALE-3D simulations of DART-like impacts on asteroid surfaces at different impact angles and found that the the vertical momentum transfer efficiency, β, is similar for different impact angles, however, the imparted momentum is reduced as the impact angle decreases. NASA’s Double Asteroid Redirection Test (DART) mission will impact its target asteroid, Dimorphos, at an oblique angle that will not be known prior to the impact.
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