View source for March 12, 2007

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=A Moving Image=
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<p>[[File:0391_0422.gif|0391_0422.gif]]<br />
<em>image by [mailto:s_fire@online.ua Павел Пресняков (Pavel Presnyakov)], Kiev Ukraine</em></p>
<p>The eye and brain make a marvelous observing instrument. Together they can concentrate on moments of ultra-stable seeing to capture tiny or subtle detail. In the last few years webcams and software have duplicated that ability, producing the amazing images that grace LPOD. But today&#8217;s LPOD goes one further, doing something that only video can easily do - capture a series of images to document sunset on a feature of interest. In Pavel&#8217;s animated gif image we see 28 frames as the shadows of the crater rim and central peaks lengthen across Humboldt on the eastern limb. It is interesting to watch a patch of floor on the limbward side of the peaks remain illuminated while all around it darkens. This is the sort of temporary illumination [http://www.glrgroup.org/tlp/JBAA_114_pp136-139_.pdf effect] that has given rise to reports of lunar transient phenomena in the past. With the time for each of these images (in Comments below) the [http://inet.uni2.dk/~d120588/henrik/jim_ltvt.html LTVT] software could be used to measure the lengths of the shadows, perhaps deducing if there is a rise of the center of the floor as there is at Petavius. I&#8217;d like to see more videos like this, whose moving shadows give new information on topography.</p>
<p>[mailto:tychocrater@yahoo.com Chuck Wood]</p>
<p><strong>Technical Details:</strong><br />
Dec 5, 2006. 10&#8243; TAL-250K Klevtsov 1:8.5 + 2X Celestron Ultima + Philips 840. Processed with Registax V4 and final process in Photoshop CS2, 1 align point, stack of 500 frames. Animated gif made with 28 frames.</p>
<p><strong>Related Links:</strong><br />
Rükl chart<br />
[http://www.astroclub.kiev.ua/forum/index.php?language=english Astropolis website]</p>
<p><b>Yesterday's LPOD:</b> [[March 11, 2007|Theophilusian Surprises]] </p>
<p><b>Tomorrow's LPOD:</b> [[March 13, 2007|Sweet Pitatus]] </p>
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