During the SL9 impact. I'd set up with the hope of seeing the illumination of Europa which was in eclipse but clear of Jupiter when the K fragment was due to hit.
No flash of Europa but as time passed I was stunned to see the pillar of ejecta from the impact standing clear off Jupiters limb like a mountain! As the planet's rotation brought the impact site into direct view the pillar was replaced by a clear view of a tiny intensly dark spot. I spent at least a couple of hours watching it grow and evolve until I was clouded out.
The whole SL9 thing was exciting and I've made many other awe inspiring observations, as have we all. But nothing quite matches Jupiter's 'mountain'.
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