Jupiter Impact 2009 |
Jupiter Impact 2009 |
Jul 19 2009, 08:13 PM
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#1
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Very interesting observation of a dark mark on Jupiter... it's starting to ripple out across Twitter...
http://www.irishastronomy.org/cms/forum?fu...;id=79644#79647 More info: http://www.acquerra.com.au/astro/ObsReport...ter-impact.html -------------------- |
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Jul 25 2009, 12:27 AM
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#2
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
I think in the case of impacts onto gas giants, the old term for a meteor crater, "astrobleme," works well. It really is more of a blemish than a crater -- and like a blemish, it will fade over time.
Almost looks like there was the familiar-from-SL9 "black-eye" effect of downstream ejecta to the left, plus a very long, very dark ejected plume that pushed back out from left to right in these images. I get the feel of an impactor on a shallow, fast trajectory moving from right to left (in the Hubble images; all this would be reversed in the original discovery photos and the Gemini images), the "black-eye" ejecta pushing ahead of the impact site (perhaps defined by shock waves from the impact), and a plume of very dark material (mostly gas, I imagine) being fountained out of the impact site back along the impactor's track, from left to right, making up the very dark, now-deforming oval marking the astrobleme. Just my gut-level feel from looking at these new, sharp images... -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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