Difference between revisions of "January 17, 2025"

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=Half a Hyginus?=
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=A New One=
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Originally published July 25, 2014
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Originally published July 21, 2014
 
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<em>Apollo 12 image [http://www.lpi.usra.edu/resources/apollo/images/print/AS12/50/7434.jpg AS12-50-7434]</em><br />
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<em>image by [mailto:russellbateman@hotmail.com Russell Bateman], Leitches Creek, Nova Scotia, Canada</em><br />
 
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Yesterday in the comments [http://lpod.wikispaces.com/share/view/68801526 section], Maurice Collins pointed out this ancient Apollo 12 image showing Sinus Aestuum and its eastern shore, with the Apennines seen in a wonderful low oblique perspective. Maurice noticed near the bottom right a half crater embayed by Aestuum's lavas. What first caught my eye is the remarkably straight dark shadow just north (above) the half crater - it looks like the emulsion was accidentally sliced by a knife. And then it hit me, Oh, that is the rille and [http://www2.lpod.org/wiki/September_30,_2012 vee-vent] that was the source of the Bode pyroclastic deposits. (And this image suggests that the rille may have originally continued to the narrower short rille to the left.) On the LRO [http://bit.ly/1phILna image] (and in real life with somewhat higher Sun than this Apollo view) this area is quite dark due to the ash. The 13-14 km wide half crater does not have a rim elevated around its immediate surroundings on its east side. That can occur with eroded impact craters, but it also is a characteristic of volcanic collapse features - notice that the vee-vent is rimless. So, it is permissible to speculate that the half crater is a volcanic caldera - one of the largest on the Moon - Hyginus is perhaps similar but only 8.7 km wide. Zooming in to the NAC images on QuickMap [http://bit.ly/1ukEOX2 shows] that dark deposits extend away from the rim, consistent with the putative caldera being the source for at least some of the Bode pyroclastics. In fact, the texture of the immediate area around the half crater is muted, as expected if mantled by ash. Finally, for those who like crater-hopping (like star-hopping) what is the mountain on the upper right horizon?<br />
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I like this image for two reasons. First, it was taken by a new contributor to LPOD, which is always a happy occurrence. And secondly, the image was acquired with inexpensive, entry-level equipment. When I was first interested in the Moon, images this good could only rarely be taken by amateurs, and really good photographs only came from large telescopes like the Lick 36&quot;, McDonald 82&quot;, and once the Lick 120&quot;. But as we have seen with previous [http://www2.lpod.org/wiki/July_13,_2011 iPhone] images and ones from other inexpensive telescopes, good results like this allow personal discoveries, annotation of nomenclature, and feeling of pride that leads to noticeable improvements. I especially encourage personal discovery - looking closely at Copernicus, for example, to recognize its elevated rim, flat floor, not quite central peaks, and strong rays. Once this basic structure of medium to large craters is understood, then differences can be noticed with smaller or older craters, leading to speculations about the processes that form and modify craters. So I welcome Russell to LPOD, and hope that he will continue his lunar studies, while reading some of the previous 3,000 plus LPODs and the books illustrated at bottom right.<br />
 
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
 
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
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Comment: I just noticed this text is a little derivative! See this [http://www2.lpod.org/wiki/April_19,_2014 LPOD]. Maybe I've run out of fresh things to say...<br />
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<strong>Technical Details</strong><br />
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July 19, 2014. Nexstar 5 SE and Neximage 5 camera @3.1mp with post processing in GiMP 2.8<br />
 
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<strong>Related Links</strong><br />
 
<strong>Related Links</strong><br />
 
<em>[[21st Century Atlas of the Moon|21st Century Atlas]]</em> charts 17 &amp; 18.<br />
 
<em>[[21st Century Atlas of the Moon|21st Century Atlas]]</em> charts 17 &amp; 18.<br />
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Russell's [https://twitter.com/RussellBateman1 Twitter page] and [https://plus.google.com/+RussellBateman/posts Google +] page with 2 million views!<br />
 
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<p><b>Yesterday's LPOD:</b> [[January 16, 2025|Wow!]] </p>
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<p><b>Yesterday's LPOD:</b> [[January 16, 2025|One of the Billions of Memories]] </p>
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<p><b>Tomorrow's LPOD:</b> [[January 18, 2025|Airbrushed Out?]] </p>
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<p><b>Tomorrow's LPOD:</b> [[January 18, 2025|Meteoroids Hitting Earth and Moon]] </p>
 
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Latest revision as of 03:20, 17 January 2025

A New One

Originally published July 21, 2014 LPOD-Jul21-14.jpg
image by Russell Bateman, Leitches Creek, Nova Scotia, Canada

I like this image for two reasons. First, it was taken by a new contributor to LPOD, which is always a happy occurrence. And secondly, the image was acquired with inexpensive, entry-level equipment. When I was first interested in the Moon, images this good could only rarely be taken by amateurs, and really good photographs only came from large telescopes like the Lick 36", McDonald 82", and once the Lick 120". But as we have seen with previous iPhone images and ones from other inexpensive telescopes, good results like this allow personal discoveries, annotation of nomenclature, and feeling of pride that leads to noticeable improvements. I especially encourage personal discovery - looking closely at Copernicus, for example, to recognize its elevated rim, flat floor, not quite central peaks, and strong rays. Once this basic structure of medium to large craters is understood, then differences can be noticed with smaller or older craters, leading to speculations about the processes that form and modify craters. So I welcome Russell to LPOD, and hope that he will continue his lunar studies, while reading some of the previous 3,000 plus LPODs and the books illustrated at bottom right.

Chuck Wood
Comment: I just noticed this text is a little derivative! See this LPOD. Maybe I've run out of fresh things to say...

Technical Details
July 19, 2014. Nexstar 5 SE and Neximage 5 camera @3.1mp with post processing in GiMP 2.8

Related Links
21st Century Atlas charts 17 & 18.
Russell's Twitter page and Google + page with 2 million views!

Yesterday's LPOD: One of the Billions of Memories

Tomorrow's LPOD: Meteoroids Hitting Earth and Moon

COMMENTS?

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