https://www2.lpod.org/index.php?title=November_4,_2021&feed=atom&action=historyNovember 4, 2021 - Revision history2024-03-29T12:00:44ZRevision history for this page on the wikiMediaWiki 1.31.1https://www2.lpod.org/index.php?title=November_4,_2021&diff=46209&oldid=prevApi: Created page with "__NOTOC__ =Blue Spots= Originally published December 21, 2011 <!-- Start of content --> <!-- ws:start:WikiTextHeadingRule:0:<h1> --> <!-- ws:start:WikiTextLocalImag..."2021-11-04T08:05:07Z<p>Created page with "__NOTOC__ =Blue Spots= Originally published December 21, 2011 <!-- Start of content --> <!-- ws:start:WikiTextHeadingRule:0:<h1> --> <!-- ws:start:WikiTextLocalImag..."</p>
<p><b>New page</b></p><div>__NOTOC__<br />
=Blue Spots=<br />
Originally published December 21, 2011<br />
<!-- Start of content --><br />
<!-- ws:start:WikiTextHeadingRule:0:&lt;h1&gt; --><br />
<!-- ws:start:WikiTextLocalImageRule:6:&lt;img src=&quot;/file/view/LPOD-Dec21-11.jpg/287814922/LPOD-Dec21-11.jpg&quot; alt=&quot;&quot; title=&quot;&quot; /&gt; -->[[File:LPOD-Dec21-11.jpg|LPOD-Dec21-11.jpg]]<!-- ws:end:WikiTextLocalImageRule:6 --><br /><br />
<em>image by [mailto:rolfhempel@gmx.de Rolf Hempel], Buchholz, Germany</em><br /><br />
<br /><br />
Rolf was aware of the broad dark patches southeast of Copernicus but when he saw a number of very small blue dots in the same area he wondered if he had dust on the camera sensor. I have enhanced his full Moon image to emphasize the spots. They are definitely there and they are real. A clue to their origin is provided by the biggest one, Copernicus H, a 4.6 km wide impact crater just south and a little east of Copernicus. This is a dark halo crater (DHC), formed by the ejection of mare lavas that lie beneath Copernicus' bright ray material. These smaller blue spots have the same origin. There are actually [http://www2.lpod.org/wiki/March_21,_2010 dozens] of DHC here. But the material they excavated and tossed onto the surface may be pyroclastics - volcanic ash. The broad dark patches are pyroclastics, explaining the blue - titanium-rich - colors. <br /><br />
<br /><br />
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /><br />
<br /><br />
<strong>Technical Details</strong><br /><br />
December 10, 2011, 21:44 UT. Apochromatic refractor 130/1200mm with effective focal length: 3575mm (using a Baader FFC projection system) + Canon 5D MK II, ISO 400, 1/100sec. 140 exposures of each quadrant, stacked with AviStack2 and combined with Panorama Studio 2 Prof.<br /><br />
<br /><br />
<strong>Related Links</strong><br /><br />
Rükl plate [https://the-moon.us/wiki/R%C3%BCkl_32 32]<br /><br />
<br /><br />
<p><b>Yesterday's LPOD:</b> [[November 3, 2021|The Pacific View]] </p><br />
<p><b>Tomorrow's LPOD:</b> [[November 5, 2021|Bright Blue Dot]] </p><br />
<hr /><br />
{{wiki/ArticleFooter}}</div>Api