Difference between revisions of "March 11, 2010"
| Line 1: | Line 1: | ||
__NOTOC__ | __NOTOC__ | ||
=Peaks & Walls= | =Peaks & Walls= | ||
| + | <!-- Start of content --> | ||
<!-- ws:start:WikiTextHeadingRule:1:<h1> --> | <!-- ws:start:WikiTextHeadingRule:1:<h1> --> | ||
<!-- ws:start:WikiTextLocalImageRule:16:<img src="/file/view/LPOD-Mar11-10.jpg/126700601/LPOD-Mar11-10.jpg" alt="" title="" /> -->[[File:LPOD-Mar11-10.jpg|LPOD-Mar11-10.jpg]]<!-- ws:end:WikiTextLocalImageRule:16 --><br /> | <!-- ws:start:WikiTextLocalImageRule:16:<img src="/file/view/LPOD-Mar11-10.jpg/126700601/LPOD-Mar11-10.jpg" alt="" title="" /> -->[[File:LPOD-Mar11-10.jpg|LPOD-Mar11-10.jpg]]<!-- ws:end:WikiTextLocalImageRule:16 --><br /> | ||
| Line 16: | Line 17: | ||
<br /> | <br /> | ||
<hr /> | <hr /> | ||
| + | <table class="wiki_table"> | ||
| + | <tr> | ||
| + | <td><!-- ws:start:WikiTextMediaRule:0:<img src="http://www.wikispaces.com/site/embedthumbnail/custom/5587353?h=0&w=0" class="WikiMedia WikiMediaCustom" id="wikitext@@media@@type=&quot;custom&quot; key=&quot;5587353&quot;" title="Custom Media"/> --><div style="text-align:center;margin:0px;padding:0px;width:280px;"><embed src="http://ra.revolvermaps.com/f/r.swf" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" quality="high" wmode="window" allowscriptaccess="always" allownetworking="all" width="280" height="280" flashvars="m=8&nostars=false&recenthits=true&i=07jzuG9zX2e&counter=true&color=ff0000&bg=000000&size=280" /><br /> | ||
| + | [http://www.revolvermaps.com/ Get Your Own Visitor Globe!]</div><!-- ws:end:WikiTextMediaRule:0 --><br /> | ||
<p><b>Yesterday's LPOD:</b> [[March 10, 2010|Handheld Moon]] </p> | <p><b>Yesterday's LPOD:</b> [[March 10, 2010|Handheld Moon]] </p> | ||
<p><b>Tomorrow's LPOD:</b> [[March 12, 2010|Wiggly Lines]] </p> | <p><b>Tomorrow's LPOD:</b> [[March 12, 2010|Wiggly Lines]] </p> | ||
| + | </td> | ||
| + | <!-- End of content --> | ||
{{wiki/ArticleFooter}} | {{wiki/ArticleFooter}} | ||
Revision as of 13:07, 8 February 2015
Peaks & Walls
image by Stefan Lammel
There are three central peaks in this snippet from a mosaic from Stefan. The peak in Arzachel, the big crater in the middle, is more or less what we think lunar central peaks should look like, except for being off-center. The peak is a massive mountain, with straight-line wall segments that reach from its summit to the crater floor. It looks sort of rugged, like a mountain should. Contrast that with the odd, rounded central peak filling the floor of Alpetragius to the west. And with the somewhat similar rounded peak in Parrot C to the east. Parrot C's peak is not as rounded as Alpet's - which Gerard Kuiper called an egg in a bird's nest - and doesn't fill the floor so completely. In fact, it is the walls of C and Alpet that look most alike. The erosional sequence of walls goes from a sharp rim crest scarp at Arzachel with somewhat rounded terraces, to Alpet where the scarp still exists but the inner wall has been completely erased/smoothed of any evidence to terraces. And C takes this one step further, with the smoothed walls extending al the way to the summit of the crater rim. Are these rounded peaks just the eroded version of a more typical mountainous peak? I don't think so. The Alpet peak is much wider in proportion to the crater floor than most peaks - Arzachel's peak could never be eroded enough to look like it. Perhaps the Alpet peak is the way most central peaks should look. A central peak forms by the rebound of ground zero. It always seemed strange that the rebound would be anything other than a broad upward swell - like the Alpet peak. Maybe we should be asking why most craters have small, non-rounded peaks?
Chuck Wood
Technical Details
Aug 12, 2009. 10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, green filter, 150/3000, Avistack, Registax, PSE5, Focus Magic
Related Links
Rükl plate 55
COMMENTS?
Register, Log in, and join in the comments.
<embed src="http://ra.revolvermaps.com/f/r.swf" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" quality="high" wmode="window" allowscriptaccess="always" allownetworking="all" width="280" height="280" flashvars="m=8&nostars=false&recenthits=true&i=07jzuG9zX2e&counter=true&color=ff0000&bg=000000&size=280" /> Get Your Own Visitor Globe! Yesterday's LPOD: Handheld Moon Tomorrow's LPOD: Wiggly Lines |
