Kearsley, A.T. and Graham, G.A. and Burchell, M.J. and Cole, M.J. and Wozniakiewicz, P. and Teslich, N. and Bringa, E. and Horz, F. and Blum, J. and Poppe, T. (2008) Micro-craters in aluminum foils: Implications for dust particles from comet Wild 2 on NASA's Stardust spacecraft. International Journal of Impact Engineering, 35 (12). pp. 1616-1624. ISSN 0734-743X.
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Dust impacts on aluminum foils during encounter of comet 81 P/Wild 2 by the Stardust spacecraft in January 2004 have been simulated using spherical projectiles of monodispersive polymer, glass, and metals, and polydispersive mineral powders of diverse grain shapes. The encounter speed of the cometary particles was a constant and modest 6.1 km s(-1), well within the capabilities of light gas guns. permitting high fidelity experiments to infer dust size, density, and mass from quantitative dimensional analysis of both natural and experimental impact features. Specific interest focused on exceptionally small impactors, all <100 mu m and some as small as 1.5 mu m. To simulate the compound shape of many Stardust craters required novel, artificial aggregate projectiles of heterogeneous mass distribution. We demonstrate that the dimensional scaling obtained previously for millimeter sized impactors extends to particles as small as 10 mu m at 6.1 km s(-1), all yielding a constant relationship for spherical soda lime glass projectiles of diameter (Dp) to crater diameter (Dc) in All 100 of Dc = 4.6 Dp; however, this ratio seems to decrease for projectiles << 10 mu m. The overwhelming majority of the Stardust craters are <20 mu m in diameter, and substantial challenges remain in quantifying the exact size-frequency distribution of the Wild 2 comet dust. Nevertheless, the current experiments provide improved insights into some of the particles' physical properties.
|Additional information:||Hypervelocity Impact Proceedings of the 2007 Symposium - HVIS 2007|
|Uncontrolled keywords:||Stardust Wild 2 Cometary dust Hypervelocity impact Crater morphology|
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences|
|Depositing User:||Jane Griffiths|
|Date Deposited:||11 May 2009 10:38|
|Last Modified:||11 May 2009 10:38|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/15737 (The current URI for this page, for reference purposes)|
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