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 | + | <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.wikispaces.com/December+4%2C+2011 map] Maurice Collins constructed with the LRO WAC mosaic I noticed a strange curved ridge <br /> | While looking at the wonderful nomenclature [http://lpod.wikispaces.com/December+4%2C+2011 map] Maurice Collins constructed with the LRO WAC mosaic I noticed a strange curved ridge <br /> | ||
| − | tangent to Kies A. It immediately reminded me of a similar curved ridge or septum between [http://www.lpod.org/?m=200611 | + | 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 <br /> |
as being created by converging ejecta from two simultaneously formed craters, but Kies A is just a single crater, although its shape is non-<br /> | as being created by converging ejecta from two simultaneously formed craters, but Kies A is just a single crater, although its shape is non-<br /> | ||
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 <br /> | 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 <br /> | ||
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the curved ridge does not require an unusual crater to form. I [http://lpod.wikispaces.com/May+31%2C+2009 wonder] if an oblique impact could produce such a curved septum? Neither <br /> | the curved ridge does not require an unusual crater to form. I [http://lpod.wikispaces.com/May+31%2C+2009 wonder] if an oblique impact could produce such a curved septum? Neither <br /> | ||
Cauchy nor Kies A is young enough to preserve rays to provide evidence for non-vertical impacts. Danny Caes had actually mentioned both <br /> | Cauchy nor Kies A is young enough to preserve rays to provide evidence for non-vertical impacts. Danny Caes had actually mentioned both <br /> | ||
| − | Kies A and Cauchy in an LPOD [http://lpod.wikispaces.com/message/view/January+20%2C+2009/8472328 | + | Kies A and Cauchy in an LPOD [http://lpod.wikispaces.com/message/view/January+20%2C+2009/8472328 comment] in 2009 and he wondered if there were more of them, which is still a good question. Finding more<br /> |
examples might lead to clues as to their origin.<br /> | examples might lead to clues as to their origin.<br /> | ||
<br /> | <br /> | ||
| − | <em>[mailto:tychocrater@yahoo.com | + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> |
<br /> | <br /> | ||
<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
Revision as of 16:43, 11 January 2015
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
