Difference between revisions of "June 18, 2014"
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=The Truth= | =The Truth= | ||
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<em>image by [http://wms.selene.jaxa.jp/selene_viewer/jpn/observation_mission/tc/tc_050.html Kaguya Terrain Camera]</em><br /> | <em>image by [http://wms.selene.jaxa.jp/selene_viewer/jpn/observation_mission/tc/tc_050.html Kaguya Terrain Camera]</em><br /> | ||
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| − | It often seems that the explanation of a lunar conundrum ought to become clear if only we had a little better resolution. Here is superb resolution from the Kaguya Terrain Camera, so which formed first, Birt or the crater on its rim, Birt A? There are three options: Birt formed first. Birt A formed first. They formed simultaneously. The observations we can make that might be relevant are that both crater rims are low where they intersect, and that rim material has been displaced toward both their floors. If the little crater Birt A formed first I would expect that it would have been more devastated by the formation of the larger crater - so I am content to reject the A first option. Birt forming first is consistent with the overhead view of [ | + | It often seems that the explanation of a lunar conundrum ought to become clear if only we had a little better resolution. Here is superb resolution from the Kaguya Terrain Camera, so which formed first, Birt or the crater on its rim, Birt A? There are three options: Birt formed first. Birt A formed first. They formed simultaneously. The observations we can make that might be relevant are that both crater rims are low where they intersect, and that rim material has been displaced toward both their floors. If the little crater Birt A formed first I would expect that it would have been more devastated by the formation of the larger crater - so I am content to reject the A first option. Birt forming first is consistent with the overhead view of [https://the-moon.us/wiki/Birt Clementine] that A's rim cuts Birt's - the missing rim from the overlap does not go halfway between each crater, but impinges on Birt's space. A characteristic of craters formed simultaneously is a straight rim septum that divides the space equally. So probably the two didn't form at the same time. If A formed last, the remaining option, the only thing to explain is the material filling much of A's floor. Essentially, A formed on tilted terrain so gravity drew onto its floor much of the material it excavated from the Birt's rim. Does that seem likely?<br /> |
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
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<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
| − | Rükl plate [ | + | Rükl plate [https://the-moon.us/wiki/R%C3%BCkl_54 54]<br /> |
[https://www.youtube.com/watch?v=DyMG99zestE Kaguya flyover]<br /> | [https://www.youtube.com/watch?v=DyMG99zestE Kaguya flyover]<br /> | ||
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<p><b>Yesterday's LPOD:</b> [[June 17, 2014|Strawberry Moonlings]] </p> | <p><b>Yesterday's LPOD:</b> [[June 17, 2014|Strawberry Moonlings]] </p> | ||
| − | <p><b>Tomorrow's LPOD:</b> [[June 19, 2014|Remembering Apollo 15 | + | <p><b>Tomorrow's LPOD:</b> [[June 19, 2014|Remembering Apollo 15 and Gordon Swann]] </p> |
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Latest revision as of 18:50, 13 October 2018
The Truth
image by Kaguya Terrain Camera
It often seems that the explanation of a lunar conundrum ought to become clear if only we had a little better resolution. Here is superb resolution from the Kaguya Terrain Camera, so which formed first, Birt or the crater on its rim, Birt A? There are three options: Birt formed first. Birt A formed first. They formed simultaneously. The observations we can make that might be relevant are that both crater rims are low where they intersect, and that rim material has been displaced toward both their floors. If the little crater Birt A formed first I would expect that it would have been more devastated by the formation of the larger crater - so I am content to reject the A first option. Birt forming first is consistent with the overhead view of Clementine that A's rim cuts Birt's - the missing rim from the overlap does not go halfway between each crater, but impinges on Birt's space. A characteristic of craters formed simultaneously is a straight rim septum that divides the space equally. So probably the two didn't form at the same time. If A formed last, the remaining option, the only thing to explain is the material filling much of A's floor. Essentially, A formed on tilted terrain so gravity drew onto its floor much of the material it excavated from the Birt's rim. Does that seem likely?
Chuck Wood
NOTE: I am replaying this classic LPOD while driving home from Boston to Wheeling after my daughter's wedding. Thx to Maurice Collins for two LPODs on the big days!
Related Links
Rükl plate 54
Kaguya flyover
Yesterday's LPOD: Strawberry Moonlings
Tomorrow's LPOD: Remembering Apollo 15 and Gordon Swann
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