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Deep Impact ejection from Comet 9P/Tempel 1 as a triggered outburst

  • Sergei I. Ipatov (a1) and Michael F. A'Hearn (a2)

Abstract

Ejection of material after the Deep Impact collision with Comet Tempel 1 was studied based on analysis of the images made by the Deep Impact cameras during the first 13 minutes after impact. Analysis of the images shows that there was a local maximum of the rate of ejection at time of ejection ~10 s with typical velocities ~100 m/s. At the same time, a considerable excessive ejection in a few directions began, the direction to the brightest pixel changed by ~50°, and there was a local increase of brightness of the brightest pixel. The ejection can be considered as a superposition of the normal ejection and the longer triggered outburst.

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References

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A'Hearn, M. F. et al. 2005, Science, 310, 258
Holsapple, K. A. & Housen, K. R. 2007, Icarus, 187, 345
Housen, K. R., Schmidt, R. M., & Holsapple, K. A. 1983, J. Geophys. Res., 88, 2485
Ipatov, S. I. & A'Hearn, M. F. 2008, http://arxiv.org/abs/0810.1294
Ipatov, S. I. & A'Hearn, M. F. 2009, Lunar. Planet. Sci. XL, 1022 (abstract)
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