Abstract
The findings of Deep Impact on the structure and composition of Tempel-1 are compared with our experimental results on large (20 cm diameter and up to 10 cm high) samples of gas-laden amorphous ice which does not contain dust. The mechanical ∼tensile strength inferred for Tempel-1: up to 12 kPa is close to our experimental findings of 2–4 kPa. This means that Tempel-1 is as fluffy as our very fluffy, talcum like, ice sample. The thermal inertia: 30<I<100 W K−1 m−2 s1/2 is close to our value of 80. The density of 350±250 kg m−3, is close to our value of 250–300 kg m−3, taking into account an ice/silicate ratio of 1 in the comet, while we study pure ice. Surface morphological features, such as non-circular depressions and chaotic terrain, were observed in our experiments. The only small increase in the gas/water vapor ratio pre- and post-impact, suggest that in the area excavated by the impactor, the 135 K front did not penetrate deeper than a few meters. Altogether, the agreement between the findings of Deep Impact and our experimental results point to a loose agglomerate of ice grains (with a silicate-organic core), which was formed by a very gentle aggregation of the ice grains, without compaction.
Workshop on Origin and Early Evolution of Comet Nuclei.
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Bar-Nun, A., Pat-El, I., Laufer, D. (2008). How Well Do Experimental Results on Large Samples of Gas-Laden Amorphous Ice Duplicate Deep Impact’s Findings?. In: Balsiger, H., Altwegg, K., Huebner, W., Owen, T., Schulz, R. (eds) Origin and Early Evolution of Comet Nuclei. Space Sciences Series of ISSI, vol 28. Springer, New York, NY. https://doi.org/10.1007/978-0-387-85455-7_12
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