May 31, 2011

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Peeking At Peaks

LPOD-May31-11.jpg

image by Ricardo Jose Vaz Tolentino, Belo Horizonte / MG, Brazil

Why do impact craters so often have twin central peaks? From theory, nuclear bomb craters, and geology of terrestrial impact craters we understand that central peaks form by the rebound of a impact-generated pressure wave that lifts up buried strata. Ideally, I would imagine that the rebound is like a set of concentric circles, each inner one representing increasing intensity of uplift, with the center doming from the deepest depth and being most intensely shocked. I picture the peak as being a conical mountain with one summit. But the shadow inside Langrenus shows that it has two closely spaced peaks. Other examples are Chuck Wood

Technical Details
2011 Feb 20, 06:26 UT; SkyWatcher 12" DOB + Celestron Ultima 2 X Barlow + ORION StarShoot Solar System Color Imager II; just one frame.

Related Links
Rükl plate 49

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