Deep Impact ejection from Comet 9P/Tempel 1 as a triggered outburst
Sergei I. Ipatov, Michael F. A'Hearn

TL;DR
This study analyzes the material ejection from Comet 9P/Tempel 1 following the Deep Impact collision, revealing a rapid initial ejection and a subsequent triggered outburst with directional and brightness changes.
Contribution
It provides detailed analysis of the ejection dynamics and identifies a superposition of normal ejection and a triggered outburst post-impact.
Findings
Peak ejection rate at ~10 seconds with velocities ~100 m/s
Directional change of ejection by ~50 degrees during outburst
Brightness increase indicating a triggered outburst
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 deg, 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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