Difference between revisions of "December 19, 2014"
| Line 3: | Line 3: | ||
<!-- ws:start:WikiTextHeadingRule:0:<h1> --> | <!-- ws:start:WikiTextHeadingRule:0:<h1> --> | ||
<!-- ws:start:WikiTextLocalImageRule:8:<img src="/file/view/LPOD-Jan_22-10.jpg/114979607/LPOD-Jan_22-10.jpg" alt="" title="" /> -->[[File:LPOD-Jan_22-10.jpg|LPOD-Jan_22-10.jpg]]<!-- ws:end:WikiTextLocalImageRule:8 --><br /> | <!-- ws:start:WikiTextLocalImageRule:8:<img src="/file/view/LPOD-Jan_22-10.jpg/114979607/LPOD-Jan_22-10.jpg" alt="" title="" /> -->[[File:LPOD-Jan_22-10.jpg|LPOD-Jan_22-10.jpg]]<!-- ws:end:WikiTextLocalImageRule:8 --><br /> | ||
| − | <em>north to the right image by [mailto:nsmith10000@yahoo.co.uk | + | <em>north to the right image by [mailto:nsmith10000@yahoo.co.uk Nick Smith], La Palma, Canary Islands</em><br /> |
<em>Originally published Jan 22, 2010.</em><br /> | <em>Originally published Jan 22, 2010.</em><br /> | ||
| − | <!-- ws:start:WikiTextHeadingRule:2:<h2> --><h2 id="toc1"><!-- ws:end:WikiTextHeadingRule:2 -->[http://www.amazon.com/Whats-Moon-Tonight-Andrew-Planck/dp/099087690X/ref=sr_1_1?s=books&ie=UTF8&qid=1418953488&sr=1-1&keywords=whats+hot+on+the+moon&pebp=1418953493313 | + | <!-- ws:start:WikiTextHeadingRule:2:<h2> --><h2 id="toc1"><!-- ws:end:WikiTextHeadingRule:2 -->[http://www.amazon.com/Whats-Moon-Tonight-Andrew-Planck/dp/099087690X/ref=sr_1_1?s=books&ie=UTF8&qid=1418953488&sr=1-1&keywords=whats+hot+on+the+moon&pebp=1418953493313 A NEW MOON BOOK FOR CHRISTMAS!]</h2> |
<br /> | <br /> | ||
| − | With modern spacecraft snapping hundreds of thousands of high resolution images from lunar orbit should amateurs bother to point their telescopes that way? Nick's stunning image provides a resounding demonstration that the answer is yes. Although there are exceptions, most lunar orbiters image areas far enough away from the terminator so that the interiors of craters are nearly free of shadows. That is because imaging is often obtained in different wavelengths to map surface compositions, and shadows obscure the area to be mapped. But shadows provide a magnification of very subtle topography, revealing features that are lost when the illumination is only a few degrees higher. Here the low angle lighting caresses every little rise and depression of the surface, showing delicate textures in familiar friends. It is widely known that saucers dent the floor of Ptolemaeus but this lighting reveals other subtle undulations as well, including some rounded bumps at upper right, and Herschel's radiating ridges and secondaries. You might confuse Alphonsus for Arzachel, for the main rille on the bottom side of the floor casts a shadow, just like the rille on Arzachel's [http://www.lpod.org/?m=20060717 | + | With modern spacecraft snapping hundreds of thousands of high resolution images from lunar orbit should amateurs bother to point their telescopes that way? Nick's stunning image provides a resounding demonstration that the answer is yes. Although there are exceptions, most lunar orbiters image areas far enough away from the terminator so that the interiors of craters are nearly free of shadows. That is because imaging is often obtained in different wavelengths to map surface compositions, and shadows obscure the area to be mapped. But shadows provide a magnification of very subtle topography, revealing features that are lost when the illumination is only a few degrees higher. Here the low angle lighting caresses every little rise and depression of the surface, showing delicate textures in familiar friends. It is widely known that saucers dent the floor of Ptolemaeus but this lighting reveals other subtle undulations as well, including some rounded bumps at upper right, and Herschel's radiating ridges and secondaries. You might confuse Alphonsus for Arzachel, for the main rille on the bottom side of the floor casts a shadow, just like the rille on Arzachel's [http://www.lpod.org/?m=20060717 floor]. In both cases the shadow shows that the side near the center of the crater moved up, as expected if an intrusion of magma bulged up the center of the craters. This image points out again why there may be so few rilles on the upper (west) half of Alphonsus - that part of the floor is veneered by a sheet of Imbrium ejecta that apparently flowed after being deposited.<br /> |
<br /> | <br /> | ||
| − | <em>[mailto:tychocrater@yahoo.com | + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> |
<br /> | <br /> | ||
<strong>Technical Details</strong><br /> | <strong>Technical Details</strong><br /> | ||
| Line 22: | Line 22: | ||
<br /> | <br /> | ||
<hr /> | <hr /> | ||
| − | You can support LPOD when you buy any book from Amazon thru [http://www.lpod.org/?page_id=591 | + | You can support LPOD when you buy any book from Amazon thru [http://www.lpod.org/?page_id=591 LPOD!] |
</div> | </div> | ||
---- | ---- | ||
===COMMENTS?=== | ===COMMENTS?=== | ||
| − | + | Register, and click on the <b>Discussion</b> tab at the top of the page. | |
Revision as of 18:21, 11 January 2015
Caressing Rays
north to the right image by Nick Smith, La Palma, Canary Islands
Originally published Jan 22, 2010.
A NEW MOON BOOK FOR CHRISTMAS!
With modern spacecraft snapping hundreds of thousands of high resolution images from lunar orbit should amateurs bother to point their telescopes that way? Nick's stunning image provides a resounding demonstration that the answer is yes. Although there are exceptions, most lunar orbiters image areas far enough away from the terminator so that the interiors of craters are nearly free of shadows. That is because imaging is often obtained in different wavelengths to map surface compositions, and shadows obscure the area to be mapped. But shadows provide a magnification of very subtle topography, revealing features that are lost when the illumination is only a few degrees higher. Here the low angle lighting caresses every little rise and depression of the surface, showing delicate textures in familiar friends. It is widely known that saucers dent the floor of Ptolemaeus but this lighting reveals other subtle undulations as well, including some rounded bumps at upper right, and Herschel's radiating ridges and secondaries. You might confuse Alphonsus for Arzachel, for the main rille on the bottom side of the floor casts a shadow, just like the rille on Arzachel's floor. In both cases the shadow shows that the side near the center of the crater moved up, as expected if an intrusion of magma bulged up the center of the craters. This image points out again why there may be so few rilles on the upper (west) half of Alphonsus - that part of the floor is veneered by a sheet of Imbrium ejecta that apparently flowed after being deposited.
Chuck Wood
Technical Details
13 August, 2009 ~06:00 UT. C14 + Lumenera Infinity 2-1M camera
Related Links
Rükl plate 44
COMMENTS?
Click on this icon PostIcon.jpg at the upper right to post a comment.
You can support LPOD when you buy any book from Amazon thru LPOD!
COMMENTS?
Register, and click on the Discussion tab at the top of the page.
