Difference between revisions of "August 6, 2014"
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=Rimshine= | =Rimshine= | ||
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<em>image by [mailto:mauricejscollins@hotmail.com Maurice Collins], New Zealand</em><br /> | <em>image by [mailto:mauricejscollins@hotmail.com Maurice Collins], New Zealand</em><br /> | ||
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| − | We have talked before of the possibility of seeing features inside shadow-filled craters. Central peaks could be seen | + | We have talked before of the possibility of seeing features inside shadow-filled craters. Central peaks could be seen |
| − | due to sunlight reflected off an illuminated crater rim. The very sensitive Terrain Camera on Kaguya may have been | + | due to sunlight reflected off an illuminated crater rim. The very sensitive Terrain Camera on Kaguya may have been |
| − | the [http://lpod. | + | the [http://www2.lpod.org/wiki/October_24,_2008 first] to do this, peering down into the always dark Shacketon crater at the South Pole. Maurice has demonstrated |
| − | here that the central peaks of Copernicus can similarly be imaged with nothing but rimshine. The peaks are only visible | + | here that the central peaks of Copernicus can similarly be imaged with nothing but rimshine. The peaks are only visible |
| − | with extreme enhancements (center) because the illumination is feeble, but two peaks are visible in the diagonal line | + | with extreme enhancements (center) because the illumination is feeble, but two peaks are visible in the diagonal line |
| − | seen on the 0834UT image. A third, fainter peak is also weakly shown making a nearly equilateral triangle. This is not | + | seen on the 0834UT image. A third, fainter peak is also weakly shown making a nearly equilateral triangle. This is not |
| − | a major peak, but a smaller clump of hills well seen on [http://bit.ly/1mkug1k LRO] (image inverted compared to this south up one). The | + | a major peak, but a smaller clump of hills well seen on [http://bit.ly/1mkug1k LRO] (image inverted compared to this south up one). The |
| − | peak closest to the bright rim is brightest because of its increased illumination, and because it is the biggest peak. | + | peak closest to the bright rim is brightest because of its increased illumination, and because it is the biggest peak. |
| − | Someday people living on the floor of Copernicus will have a magical hour or so of a faint glow from rimshine, with | + | Someday people living on the floor of Copernicus will have a magical hour or so of a faint glow from rimshine, with |
| − | Earthshine brightening the stygian darkness of the totally unilluminated dark phases. <br /> | + | Earthshine brightening the stygian darkness of the totally unilluminated dark phases. |
| + | <br /> | ||
<br /> | <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 /> | ||
| − | <em>[ | + | <em>[[21st Century Atlas of the Moon|21st Century Atlas]]</em> charts 17 & 22.<br /> |
<br /> | <br /> | ||
<p><b>Yesterday's LPOD:</b> [[August 5, 2014|Little World, Big World]] </p> | <p><b>Yesterday's LPOD:</b> [[August 5, 2014|Little World, Big World]] </p> | ||
<p><b>Tomorrow's LPOD:</b> [[August 7, 2014|What Lunar Scientists Do]] </p> | <p><b>Tomorrow's LPOD:</b> [[August 7, 2014|What Lunar Scientists Do]] </p> | ||
<hr /> | <hr /> | ||
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Latest revision as of 08:24, 28 October 2018
Rimshine
image by Maurice Collins, New Zealand
We have talked before of the possibility of seeing features inside shadow-filled craters. Central peaks could be seen
due to sunlight reflected off an illuminated crater rim. The very sensitive Terrain Camera on Kaguya may have been
the first to do this, peering down into the always dark Shacketon crater at the South Pole. Maurice has demonstrated
here that the central peaks of Copernicus can similarly be imaged with nothing but rimshine. The peaks are only visible
with extreme enhancements (center) because the illumination is feeble, but two peaks are visible in the diagonal line
seen on the 0834UT image. A third, fainter peak is also weakly shown making a nearly equilateral triangle. This is not
a major peak, but a smaller clump of hills well seen on LRO (image inverted compared to this south up one). The
peak closest to the bright rim is brightest because of its increased illumination, and because it is the biggest peak.
Someday people living on the floor of Copernicus will have a magical hour or so of a faint glow from rimshine, with
Earthshine brightening the stygian darkness of the totally unilluminated dark phases.
Chuck Wood
Related Links
21st Century Atlas charts 17 & 22.
Yesterday's LPOD: Little World, Big World
Tomorrow's LPOD: What Lunar Scientists Do
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