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| =Necho's Peculiar Rays= | | =Necho's Peculiar Rays= |
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| + | <p>[[File:AS11-44-6657LPOD.jpg|AS11-44-6657LPOD.jpg]][[File:Necho-Clem.jpg|Necho-Clem.jpg]]<br /> |
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− | <p>[[File:AS11-44-6657LPOD.jpg|AS11-44-6657LPOD.jpg]][[File:Necho-Clem.jpg|Necho-Clem.jpg]]<br />
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| <em>Apollo 11-44-6657 image (left) from [http://www.apolloarchive.com/apollo_gallery.html Apollo Archive] and Clementine color ratio image (right) from Map-A-Planet. Make your browser window wide enough so that the images are side by side.</em></p> | | <em>Apollo 11-44-6657 image (left) from [http://www.apolloarchive.com/apollo_gallery.html Apollo Archive] and Clementine color ratio image (right) from Map-A-Planet. Make your browser window wide enough so that the images are side by side.</em></p> |
− | <p>The farside is frustratingly hard to study. There aren’t good maps or images (Clementine’s have phase variations and Lunar Orbiter and Apollo are piece-meal with various resolutions and look angles). But there are many bizarre features. Necho is a very fresh 30 km diameter crater on the SE quadrant of the farside. Necho’s rays are very asymetrical, extending five or more times further to the north-northwest than in any other direction. This suggests an oblique impact, with the projectile coming from the south-southeast, but there is not a zone of avoidance in that direction. The Clementine color ratio image also suggests that King crater interupts - and hence is younger than - the Necho rays. This is peculiar because although [http://www.lpod.org/?m=20060626 King] is also young, it doesn’t have a significant ray system. I’ve always thought that Necho was the younger of these two craters, but now I’m not sure. </p> | + | <p>The farside is frustratingly hard to study. There aren’t good maps or images (Clementine’s have phase variations and Lunar Orbiter and Apollo are piece-meal with various resolutions and look angles). But there are many bizarre features. Necho is a very fresh 30 km diameter crater on the SE quadrant of the farside. Necho’s rays are very asymetrical, extending five or more times further to the north-northwest than in any other direction. This suggests an oblique impact, with the projectile coming from the south-southeast, but there is not a zone of avoidance in that direction. The Clementine color ratio image also suggests that King crater interupts - and hence is younger than - the Necho rays. This is peculiar because although [[June_26,_2006|King]] is also young, it doesn’t have a significant ray system. I’ve always thought that Necho was the younger of these two craters, but now I’m not sure. </p> |
| <p>[mailto:tychocrater@yahoo.com Chuck Wood]</p> | | <p>[mailto:tychocrater@yahoo.com Chuck Wood]</p> |
| <p><strong>Related Links:</strong><br /> | | <p><strong>Related Links:</strong><br /> |
| [http://adsabs.harvard.edu/abs/1979M&P....21...25G Geology of the lunar farside crater Necho], Gifford, A. W.; Maxwell, T. A.; El-Baz, F., Moon and the Planets, vol. 21, Aug. 1979, p. 25-42.</p> | | [http://adsabs.harvard.edu/abs/1979M&P....21...25G Geology of the lunar farside crater Necho], Gifford, A. W.; Maxwell, T. A.; El-Baz, F., Moon and the Planets, vol. 21, Aug. 1979, p. 25-42.</p> |
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