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• W3039341925 endingPage "113963" @default.
• W3039341925 startingPage "113963" @default.
• W3039341925 abstract "Spin off events and impacts can eject boulders from an asteroid surface and rubble pile asteroids can accumulate from debris following a collision between large asteroids. These processes produce a population of gravitational bound objects in orbit that can impact an asteroid surface at low velocity and with a distribution of impact angles. We present laboratory experiments of low velocity spherical projectiles into a fine granular medium, sand. We delineate velocity and impact angles giving ricochets, those giving projectiles that roll-out from the impact crater and those that stop within their impact crater. With high speed camera images and fluorescent markers on the projectiles we track spin and projectile trajectories during impact. We find that the projectile only reaches a rolling without slipping condition well after the marble has reached peak penetration depth. The required friction coefficient during the penetration phase of impact is 4-5 times lower than that of the sand suggesting that the sand is fluidized near the projectile surface during penetration. We find that the critical grazing impact critical angle dividing ricochets from roll-outs, increases with increasing impact velocity. The critical angles for ricochet and for roll-out as a function of velocity can be matched by an empirical model during the rebound phase that balances a lift force against gravity. We estimate constraints on projectile radius, velocity and impact angle that would allow projectiles on asteroids to ricochet or roll away from impact, finally coming to rest distant from their initial impact sites." @default.
• W3039341925 created "2020-07-10" @default.
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• W3039341925 date "2020-11-01" @default.
• W3039341925 modified "2023-10-18" @default.
• W3039341925 title "Ricochets on asteroids: Experimental study of low velocity grazing impacts into granular media" @default.
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• W3039341925 doi "https://doi.org/10.1016/j.icarus.2020.113963" @default.
• W3039341925 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7571586" @default.
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• W3039341925 hasPublicationYear "2020" @default.
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