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.wikispaces.com/December+4%2C+2011 map] Maurice Collins constructed with the LRO WAC mosaic I noticed a strange curved ridge | + | 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 |
− | 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- | + | 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 | + | 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.wikispaces.com/May+31%2C+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 | + | 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 [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 |
− | 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 | + | examples might lead to clues as to their origin. |
− | examples might lead to clues as to their origin.<br /> | + | <br /> |
<br /> | <br /> | ||
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
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Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+53 53]<br /> | Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+53 53]<br /> | ||
<br /> | <br /> | ||
+ | <hr /> | ||
<p><b>Yesterday's LPOD:</b> [[December 18, 2011|Continuing Discovery]] </p> | <p><b>Yesterday's LPOD:</b> [[December 18, 2011|Continuing Discovery]] </p> | ||
<p><b>Tomorrow's LPOD:</b> [[December 20, 2011|The Pacific View]] </p> | <p><b>Tomorrow's LPOD:</b> [[December 20, 2011|The Pacific View]] </p> | ||
− | < | + | <!-- End of content --> |
{{wiki/ArticleFooter}} | {{wiki/ArticleFooter}} |
Revision as of 16:19, 1 March 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
Yesterday's LPOD: Continuing Discovery
Tomorrow's LPOD: The Pacific View
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