Difference between revisions of "December 27, 2013"
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=Two Little Known Valleys= | =Two Little Known Valleys= | ||
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| − | <em>left image by [mailto:gtarsoudis@gmail.com | + | <em>left image by [mailto:gtarsoudis@gmail.com George Tarsoudis], and right image from [http://bit.ly/K8PBPp LRO QuickMap]</em><br /> |
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| − | In an excellent new [http://www.lunar-captures.com/craters_C_files/131220_Cleomedes_Burchardt_Geminus_Tar.jpg | + | In an excellent new [http://www.lunar-captures.com/craters_C_files/131220_Cleomedes_Burchardt_Geminus_Tar.jpg mosaic] of the area north of Mare Crisium, George noted a linear shadow striking towards the southeast from the southern edge of the complex crater [https://the-moon.us/wiki/Geminus Geminus]. |
| − | The much higher Sun LRO Quickmap reveals two linear features here; George's shadowed feature is the southern one. I had not noticed these before and down't know what | + | The much higher Sun LRO Quickmap reveals two linear features here; George's shadowed feature is the southern one. I had not noticed these before and down't know what |
| − | tectonic forces caused their formation. The top one looks like a typical, but wide, flat-floored graben; it is about 60 km long and 7 km wide. The southern linear feature has more of a | + | tectonic forces caused their formation. The top one looks like a typical, but wide, flat-floored graben; it is about 60 km long and 7 km wide. The southern linear feature has more of a |
| − | gentle vee-shaped floor and trends in a very slightly different direction than the northern valley. The northern valley is exactly radial to the central peaks of Geminus, suggesting that | + | gentle vee-shaped floor and trends in a very slightly different direction than the northern valley. The northern valley is exactly radial to the central peaks of Geminus, suggesting that |
| − | it could be a secondary crater chain or radial fracture associated with that crater. But Geminus is very fresh - notice its sharp rim crest - and these valleys are not. Nor are they radial | + | it could be a secondary crater chain or radial fracture associated with that crater. But Geminus is very fresh - notice its sharp rim crest - and these valleys are not. Nor are they radial |
| − | to any nearby basin, and in fact, they cut at an oblique angle the Geminus - Berosus outer rim of the Crisium Basin. George's linear shadow does mark a little known pair of valleys, | + | to any nearby basin, and in fact, they cut at an oblique angle the Geminus - Berosus outer rim of the Crisium Basin. George's linear shadow does mark a little known pair of valleys, |
| − | but their origin remain uncertain to me. | + | but their origin remain uncertain to me. |
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| − | <em>[mailto:tychocrater@yahoo.com | + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> |
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<strong>Technical Details</strong><br /> | <strong>Technical Details</strong><br /> | ||
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<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
| − | <em>[ | + | <em>[[21st Century Atlas of the Moon|21st Century Atlas]]</em> chart 1.<br /> |
| − | George's [/www.lunar-captures.com website]<br /> | + | George's [http://www.lunar-captures.com website]<br /> |
<br /> | <br /> | ||
| + | <p><b>Yesterday's LPOD:</b> [[December 26, 2013|33 And Counting]] </p> | ||
| + | <p><b>Tomorrow's LPOD:</b> [[December 28, 2013|Looking Over the Shoulder of a Lunar Scientist]] </p> | ||
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Latest revision as of 08:25, 28 October 2018
Two Little Known Valleys
left image by George Tarsoudis, and right image from LRO QuickMap
In an excellent new mosaic of the area north of Mare Crisium, George noted a linear shadow striking towards the southeast from the southern edge of the complex crater Geminus.
The much higher Sun LRO Quickmap reveals two linear features here; George's shadowed feature is the southern one. I had not noticed these before and down't know what
tectonic forces caused their formation. The top one looks like a typical, but wide, flat-floored graben; it is about 60 km long and 7 km wide. The southern linear feature has more of a
gentle vee-shaped floor and trends in a very slightly different direction than the northern valley. The northern valley is exactly radial to the central peaks of Geminus, suggesting that
it could be a secondary crater chain or radial fracture associated with that crater. But Geminus is very fresh - notice its sharp rim crest - and these valleys are not. Nor are they radial
to any nearby basin, and in fact, they cut at an oblique angle the Geminus - Berosus outer rim of the Crisium Basin. George's linear shadow does mark a little known pair of valleys,
but their origin remain uncertain to me.
Chuck Wood
Technical Details
Dec 20, 2013. Telescope SkyWatcher 14 inch @f/4.5, camera QHY 5L-II, filter IR-pass, barlow 3X, mosaic 2 images. Condition with pure seeing, good transparency.
Related Links
21st Century Atlas chart 1.
George's website
Yesterday's LPOD: 33 And Counting
Tomorrow's LPOD: Looking Over the Shoulder of a Lunar Scientist
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