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| | =Bright Streaks= | | =Bright Streaks= |
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| | + | <div class="post" id="post-1659"> |
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| − | //image by [[mailto: Credit Goes Here]]//
| + | <div class="storycontent"> |
| − | | + | <p>[[File:Brayley2007-12-23aENH.jpg|brayley2007-12-23aENH.jpg]]<br /> |
| − | <h2>January 2, 2008</h2>
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| − | <div class="post" id="post-1659">
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| − | <h3 class="storytitle">[http://www.lpod.org/?p=1659" rel="bookmark BRIGHT STREAKS]</h3>
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| − | <div class="storycontent"> | |
| − | <p> <img id="image1660" src="http: //www.lpod.org/wp-content/uploads/2008/01/brayley2007-12-23aENH.jpg " alt="brayley2007-12-23aENH.jpg " /><br /> | |
| | <em>image by [mailto:MarioWeigand@gmx.de Mario Weigand], Offenbach am Main, Germany</em></p> | | <em>image by [mailto:MarioWeigand@gmx.de Mario Weigand], Offenbach am Main, Germany</em></p> |
| − | <p>Look what I found in the LPOD Photo Gallery! Mario Weigand recently added five high Sun images including this fascinating one of the 14 km wide crater [http://the-moon.wikispaces.com/Brayley Brayley] in far western Mare Imbrium. I have used an unsharp mask filter in <em>PhotoShop</em> to heighten the contrast to better see details and subtleties. Brayley and Brayley B to the east are both banded craters. These are relatively fresh craters with dark or bright streaks down their inner rims. The dark is the normal soil, darkened by solar radiation, and the bright streaks are freshly exposed material that has not yet been radiation darkened. Landsliding downslope of surface rocks exposes the bright material. Older craters generally lack banding because the material on the rims has reached a double equilibrium - all the material has slided that is likely to, and the last landslide was so long ago that all the material is dark. Note the bright round spot on the west side of the rim - I bet that is a small impact crater. Also look at the elongated central peak and notice that Brayley B and C to the west also have peaks. Not all craters this small have central peaks. Two more sights. Brayley is where rays from Copernicus (bottom right) and Aristarchus (top left) meet. Finally, see the white piece of tread north of Brayley? That isn’t a defect, but the [http://www.lpod.org/archive/LPOD-2004-07-08.htm Brayley Rille], a notoriously difficult feature to image. High Sun views extend our discovery of subtlety. </p> | + | <p>Look what I found in the LPOD Photo Gallery! Mario Weigand recently added five high Sun images including this fascinating one of the 14 km wide crater [https://the-moon.us/wiki/Brayley Brayley] in far western Mare Imbrium. I have used an unsharp mask filter in <em>PhotoShop</em> to heighten the contrast to better see details and subtleties. Brayley and Brayley B to the east are both banded craters. These are relatively fresh craters with dark or bright streaks down their inner rims. The dark is the normal soil, darkened by solar radiation, and the bright streaks are freshly exposed material that has not yet been radiation darkened. Landsliding downslope of surface rocks exposes the bright material. Older craters generally lack banding because the material on the rims has reached a double equilibrium - all the material has slided that is likely to, and the last landslide was so long ago that all the material is dark. Note the bright round spot on the west side of the rim - I bet that is a small impact crater. Also look at the elongated central peak and notice that Brayley B and C to the west also have peaks. Not all craters this small have central peaks. Two more sights. Brayley is where rays from Copernicus (bottom right) and Aristarchus (top left) meet. Finally, see the white piece of tread north of Brayley? That isn’t a defect, but the [[July_8,_2004|Brayley Rille]], a notoriously difficult feature to image. High Sun views extend our discovery of subtlety. </p> |
| | <p>[mailto:tychocrater@yahoo.com Chuck Wood]</p> | | <p>[mailto:tychocrater@yahoo.com Chuck Wood]</p> |
| | <p><b>Technical Details:</b><br /> | | <p><b>Technical Details:</b><br /> |
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| | Rükl plate 19<br /> | | Rükl plate 19<br /> |
| | [http://www.SkyTrip.de/ Mario’s website]</p> | | [http://www.SkyTrip.de/ Mario’s website]</p> |
| − | <p align="center"> | + | <p><b>Yesterday's LPOD:</b> [[January 1, 2008|Welcoming a New LPOD Year]] </p> |
| − | <i>Now you can support LPOD when you buy any book from Amazon thru [http://www.lpod.org/?page_id=591 LPOD!]</i></p> | + | <p><b>Tomorrow's LPOD:</b> [[January 3, 2008|Highland Volcanism?]] </p> |
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| − | ---- | + | {{wiki/ArticleFooter}} |
| − | ===COMMENTS?===
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| − | Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment.
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| − | ---- | |
| − | You can support LPOD when you buy any book from Amazon thru [[http://www.lpod.org/?page_id=591|LPOD!]]
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