Difference between revisions of "December 19, 2011"

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=Single Crater Septum=
 
=Single Crater Septum=
 
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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.wikispaces.com/December+4%2C+2011 map] Maurice Collins constructed with the LRO WAC mosaic I noticed a strange curved ridge <br />
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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 <br />
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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-<br />
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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  
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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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 <br />
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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<br />
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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  
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 />
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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 <br />
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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
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 />
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examples might lead to clues as to their origin.
examples might lead to clues as to their origin.<br />
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<br />
 
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
 
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
 
<br />
 
<br />
 
<strong>Related Links</strong><br />
 
<strong>Related Links</strong><br />
Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+53 53]<br />
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Rükl plate [https://the-moon.us/wiki/R%C3%BCkl_53 53]<br />
 
<br />
 
<br />
 
<hr />
 
<hr />
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<p><b>Yesterday's LPOD:</b> [[December 18, 2011|Continuing Discovery]] </p>
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<p><b>Tomorrow's LPOD:</b> [[December 20, 2011|The Pacific View]] </p>
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Latest revision as of 08:25, 28 October 2018

Single Crater Septum

LPOD-Dec19-11.jpg
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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