Difference between revisions of "December 19, 2011"
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<em>left: image from LRO WAC mosaic, and right: close-up of Kies A from LRO WAC [http://target.lroc.asu.edu/da/qmap.html Act-REACT Quick Map]</em><br /> | <em>left: image from LRO WAC mosaic, and right: close-up of Kies A from LRO WAC [http://target.lroc.asu.edu/da/qmap.html Act-REACT Quick Map]</em><br /> | ||
<br /> | <br /> | ||
− | While looking at the wonderful nomenclature [http://lpod. | + | While looking at the wonderful nomenclature [http://www2.lpod.org/wiki/December_4,_2011 map] Maurice Collins constructed with the LRO WAC mosaic I noticed a strange curved ridge |
tangent to Kies A. It immediately reminded me of a similar curved ridge or septum between [http://www.lpod.org/?m=200611 Plato K and KA.] This latter case is explained | tangent to Kies A. It immediately reminded me of a similar curved ridge or septum between [http://www.lpod.org/?m=200611 Plato K and KA.] This latter case is explained | ||
as being created by converging ejecta from two simultaneously formed craters, but Kies A is just a single crater, although its shape is non-round. So I found a higher Sun LROC WAC view from the Quick Map - thanks ASU/NASA for two different mosaics! - that doesn't suggest | as being created by converging ejecta from two simultaneously formed craters, but Kies A is just a single crater, although its shape is non-round. So I found a higher Sun LROC WAC view from the Quick Map - thanks ASU/NASA for two different mosaics! - that doesn't suggest | ||
two almost completely overlapping simulataneous craters. There is a small scallop on the northeast side where a collapse removed a small | two almost completely overlapping simulataneous craters. There is a small scallop on the northeast side where a collapse removed a small | ||
bite from the rim. Then I remembered a second case of a similar single crater arc at Cauchy. Cauchy is a perfectly normal circular crater so | bite from the rim. Then I remembered a second case of a similar single crater arc at Cauchy. Cauchy is a perfectly normal circular crater so | ||
− | the curved ridge does not require an unusual crater to form. I [http://lpod. | + | the curved ridge does not require an unusual crater to form. I [http://www2.lpod.org/wiki/May_31,_2009 wonder] if an oblique impact could produce such a curved septum? Neither |
Cauchy nor Kies A is young enough to preserve rays to provide evidence for non-vertical impacts. Danny Caes had actually mentioned both | Cauchy nor Kies A is young enough to preserve rays to provide evidence for non-vertical impacts. Danny Caes had actually mentioned both | ||
− | Kies A and Cauchy in an LPOD | + | Kies A and Cauchy in an LPOD comment in 2009 and he wondered if there were more of them, which is still a good question. Finding more |
examples might lead to clues as to their origin. | examples might lead to clues as to their origin. | ||
<br /> | <br /> |
Latest revision as of 08:25, 28 October 2018
Single Crater Septum
left: image from LRO WAC mosaic, and right: close-up of Kies A from LRO WAC Act-REACT Quick Map
While looking at the wonderful nomenclature map Maurice Collins constructed with the LRO WAC mosaic I noticed a strange curved ridge
tangent to Kies A. It immediately reminded me of a similar curved ridge or septum between Plato K and KA. This latter case is explained
as being created by converging ejecta from two simultaneously formed craters, but Kies A is just a single crater, although its shape is non-round. So I found a higher Sun LROC WAC view from the Quick Map - thanks ASU/NASA for two different mosaics! - that doesn't suggest
two almost completely overlapping simulataneous craters. There is a small scallop on the northeast side where a collapse removed a small
bite from the rim. Then I remembered a second case of a similar single crater arc at Cauchy. Cauchy is a perfectly normal circular crater so
the curved ridge does not require an unusual crater to form. I wonder if an oblique impact could produce such a curved septum? Neither
Cauchy nor Kies A is young enough to preserve rays to provide evidence for non-vertical impacts. Danny Caes had actually mentioned both
Kies A and Cauchy in an LPOD comment in 2009 and he wondered if there were more of them, which is still a good question. Finding more
examples might lead to clues as to their origin.
Chuck Wood
Related Links
Rükl plate 53
Yesterday's LPOD: Continuing Discovery
Tomorrow's LPOD: The Pacific View
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