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    Interpretation of Wild 2 dust fine structure: Comparison of Stardust aluminum foil craters to the three-dimensional shape of experimental impacts by artificial aggregate particles and meteorite powders

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    Author
    Kearsley, A. T.
    Burchell, M. J.
    Price, M. C.
    Graham, G. A.
    Wozniakiewicz, P. J.
    Cole, M. J.
    Foster, N. J.
    Teslich, N.
    Issue Date
    2009-01-01
    Keywords
    stardust space missions
    impacts
    Wild 2
    dust aggregate
    
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    Citation
    Kearsley, A. T., Burchell, M. J., Price, M. C., Graham, G. A., Wozniakiewicz, P. J., Cole, M. J., ... & Teslich, N. (2009). Interpretation of Wild 2 dust fine structure: Comparison of Stardust aluminum foil craters to the three‐dimensional shape of experimental impacts by artificial aggregate particles and meteorite powders. Meteoritics & Planetary Science, 44(10), 1489-1509.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656623
    DOI
    10.1111/j.1945-5100.2009.tb01188.x
    Additional Links
    https://meteoritical.org/
    Abstract
    New experimental results show that Stardust crater morphology is consistent with interpretation of many larger Wild 2 dust grains being aggregates, albeit most of low porosity and therefore relatively high density. The majority of large Stardust grains (i.e. those carrying most of the cometary dust mass) probably had density of 2.4 g cm^(-3) (similar to soda-lime glass used in earlier calibration experiments) or greater, and porosity of 25% or less, akin to consolidated carbonaceous chondrite meteorites, and much lower than the 80% suggested for fractal dust aggregates. Although better size calibration is required for interpretation of the very smallest impacting grains, we suggest that aggregates could have dense components dominated by m-scale and smaller sub-grains. If porosity of the Wild 2 nucleus is high, with similar bulk density to other comets, much of the pore space may be at a scale of tens of micrometers, between coarser, denser grains. Successful demonstration of aggregate projectile impacts in the laboratory now opens the possibility of experiments to further constrain the conditions for creation of bulbous (Type degrees C) tracks in aerogel, which we have observed in recent shots. We are also using mixed mineral aggregates to document differential survival of pristine composition and crystalline structure in diverse finegrained components of aggregate cometary dust analogues, impacted onto both foil and aerogel under Stardust encounter conditions.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2009.tb01188.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 44, Number 10 (2009)

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