QUOTE (garybeau @ Sep 7 2006, 12:50 AM)
That is some pretty amazing video. If I read the caption correctly, the frame size is 200km x 200km which
makes the dust plume at least 50 - 75 km long. The frames were taken with an infrared camera, are we
seeing the remnent heat from the impact or is the dust popping up into the sunlight?
...or is it the heating of the surface by falling debris?
Whichever it is, given that the plume fades at 50-75km, and lasts for 130 seconds or so, that allows us to look at the ballistics for the most energetic (in terms of range) element of this visible debris.
I see launch angles/ejection velocities ranging from: 24 deg @ 300 m/s, through to a peak around 12 deg @ 500, and fading out at 8 deg @ 700 m/s, to fulfill those criteria. Quite different to the impact angle of <1 deg and velocity ~2000 m/s.
Does that give us any clue to the topography of the impact area?
Andy