February 19, 2016
A Chain of Mystery
Originally published April 25, 2005
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Image Credit: Paolo Lazzarotti |
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A Chain of Mystery Astronomers have apparently failed to notice that the Moon is getting closer to the earth. That is a possible conclusion, based upon the continually improving ability of amateurs to image delicate features previously at or beyond capabilities of even the largest observatory telescopes. Consider the Triesnecker Rilles, the rille on the floor of the Alpine Valley, and the Davy crater chain - all are well known lunar features that used to be very difficult to observe or image. And now, as Paolos impressive image of the Davy chain demonstrates, amateurs are acquiring images of near-spacecraft quality. I explained the probable origin of the Davy chain in two earlier LPODs - Jan 27, 04 and Jul 14, 04 - as a rat-a-tat-tat of near simultaneous impacts of fragments from a disintegrated comet. But you can see other things in this image too. Note the large, sharp crater (Davy G) at the right end of the chain - it isnt related to the chain craters but makes it easy to find an inconspicuous crater. Just left of G there is a ruined crater that is a little larger than 35 km Davy at the bottom left. This ruin has been draped by ejecta from the Imbrium basin and only a vague rim and shallow depression remain. Technical Details: Related Links: Yesterday's LPOD: Fabulous Fab! Tomorrow's LPOD: More Spectacular Flows in Imbrium |
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