Difference between revisions of "September 22, 2009"
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− | <em>image by [mailto:bob_p@earthlink.net Bob Pilz]</em><br /> | + | <em>image by [mailto:bob_p@earthlink.net" rel="nofollow Bob Pilz]</em><br /> |
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− | Look carefully at the inner walls of Aristarchus. Notice anything unusual? Not the bright spot on the near rim which is where a ray was deposited. Look at the opposite rim where a terrace near the top of the rim bends sharply down and about halfway down the rim turns up and stops. The terrace directly below it repeats the Z shape. Terraces don't do this. They are places where a large, fairly coherent mass of rim material slides downslope as a unit. Often terraces can be traced halfway or sometimes nearly all the way around the rim, showing that the whole annular block slid down at the same time - what a sight! The Zs show up in Alan Friedman's [http://www.lpod.org/?m=20071112 image] and a similar phase [http://www.lpod.org/archive/LPOD-2005-01-01.htm one] by Wes Higgins. Strangely, I have not yet been able to find a spacecraft image with the right lighting to show the Zs. The famous Lunar Orbiter IV-150 [http://the-moon.wikispaces.com/Aristarchus shot] has a high opposite lighting, clearly revealing the wall, but the Zs are not apparent. No better luck with Clementine, nor Apollo. Although it looks real I am beginning to think the Zs are a trick of lighting, rather than bending terraces. Who can come up with images to resolve this uncertainty?<br /> | + | Look carefully at the inner walls of Aristarchus. Notice anything unusual? Not the bright spot on the near rim which is where a ray was deposited. Look at the opposite rim where a terrace near the top of the rim bends sharply down and about halfway down the rim turns up and stops. The terrace directly below it repeats the Z shape. Terraces don't do this. They are places where a large, fairly coherent mass of rim material slides downslope as a unit. Often terraces can be traced halfway or sometimes nearly all the way around the rim, showing that the whole annular block slid down at the same time - what a sight! The Zs show up in Alan Friedman's [http://www.lpod.org/?m=20071112" rel="nofollow image] and a similar phase [http://www.lpod.org/archive/LPOD-2005-01-01.htm" rel="nofollow one] by Wes Higgins. Strangely, I have not yet been able to find a spacecraft image with the right lighting to show the Zs. The famous Lunar Orbiter IV-150 [http://the-moon.wikispaces.com/Aristarchus shot] has a high opposite lighting, clearly revealing the wall, but the Zs are not apparent. No better luck with Clementine, nor Apollo. Although it looks real I am beginning to think the Zs are a trick of lighting, rather than bending terraces. Who can come up with images to resolve this uncertainty?<br /> |
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− | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | + | <em>[mailto:tychocrater@yahoo.com" rel="nofollow Chuck Wood]</em><br /> |
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<strong>Technical Details</strong><br /> | <strong>Technical Details</strong><br /> |
Revision as of 19:13, 4 January 2015
Catching Some Zzz
image by " rel="nofollow Bob Pilz
Look carefully at the inner walls of Aristarchus. Notice anything unusual? Not the bright spot on the near rim which is where a ray was deposited. Look at the opposite rim where a terrace near the top of the rim bends sharply down and about halfway down the rim turns up and stops. The terrace directly below it repeats the Z shape. Terraces don't do this. They are places where a large, fairly coherent mass of rim material slides downslope as a unit. Often terraces can be traced halfway or sometimes nearly all the way around the rim, showing that the whole annular block slid down at the same time - what a sight! The Zs show up in Alan Friedman's " rel="nofollow image and a similar phase " rel="nofollow one by Wes Higgins. Strangely, I have not yet been able to find a spacecraft image with the right lighting to show the Zs. The famous Lunar Orbiter IV-150 shot has a high opposite lighting, clearly revealing the wall, but the Zs are not apparent. No better luck with Clementine, nor Apollo. Although it looks real I am beginning to think the Zs are a trick of lighting, rather than bending terraces. Who can come up with images to resolve this uncertainty?
" rel="nofollow Chuck Wood
Technical Details
2009/09/13, UT: ~10:47. 200mm f/6 Newtonian, Televue 4X Barlow, DMK 21BF04 camera, Blue filter, 15 fps, Exposure 1/30 sec, 800/18000 frames. Processed by Registax V5, PS CS4, FocusMagic. Taken from Lat: 35 degrees 36 minutes N, Long: 82 degrees 33 minutes W, Elev: ~850m.
Related Links
Rükl plate 18