Difference between revisions of "November 18, 2010"

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=Two Ancient Giants=
 
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<em>image by [mailto:howardeskildsen@msn.com" rel="nofollow Howard Eskildsen], Ocala, Florida</em><br />
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<em>image by [mailto:howardeskildsen@msn.com Howard Eskildsen], Ocala, Florida</em><br />
 
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Here are two large old craters, each crossed by a gash. Do you see them? For one crater you might ask, where is the gash, and the question about the other might be where is the crater? Deslandres is the ~235 km wide crater at bottom right. Its gash, hinted at here and often not seen under other lightings, is the broad, rille-like trough at about the 4 pm position, passing into Lexell. Another gash made of four secondary craters from Tycho is on northeast part of Deslandres' floor. The second giant crater, about 200 km wide and encircling the Straight Wall has sometimes been called Ancient Thebit. The Straight Wall is on a chord - almost a diameter - stretching between the two mountainous ends of Ancient Thebit; to the north, the end of the rim is Prom. Taenarium, and the southern end is smashed by the chain of craters, [http://the-moon.wikispaces.com/file/detail/Rukl_55_satellites_SW.jpg" rel="nofollow Purbach H, L and M]. Just as Howard's image made visible the putative broad rille at Deslandres, it also graphically points out that the interior of Ancient Thebit is relatively flat mare material, while the mare immediately west is criss-crossed by ridges. The mare material may be thicker within Ancient Thebit, but I don't know why mare ridges are absent there while abundant beyond the rim.<br />
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Here are two large old craters, each crossed by a gash. Do you see them? For one crater you might ask, where is the gash, and the question about the other might be where is the crater? Deslandres is the ~235 km wide crater at bottom right. Its gash, hinted at here and often not seen under other lightings, is the broad, rille-like trough at about the 4 pm position, passing into Lexell. Another gash made of four secondary craters from Tycho is on northeast part of Deslandres' floor. The second giant crater, about 200 km wide and encircling the Straight Wall has sometimes been called Ancient Thebit. The Straight Wall is on a chord - almost a diameter - stretching between the two mountainous ends of Ancient Thebit; to the north, the end of the rim is Prom. Taenarium, and the southern end is smashed by the chain of craters, [https://the-moon.us/wiki/file/detail/Rukl_55_satellites_SW.jpg Purbach H, L and M]. Just as Howard's image made visible the putative broad rille at Deslandres, it also graphically points out that the interior of Ancient Thebit is relatively flat mare material, while the mare immediately west is criss-crossed by ridges. The mare material may be thicker within Ancient Thebit, but I don't know why mare ridges are absent there while abundant beyond the rim.<br />
 
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<em>[mailto:tychocrater@yahoo.com" rel="nofollow Chuck Wood]</em><br />
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<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 />
Rükl plates [http://the-moon.wikispaces.com/R%C3%BCkl+54 54] +[http://the-moon.wikispaces.com/R%C3%BCkl+65 65]<br />
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Rükl plates [https://the-moon.us/wiki/R%C3%BCkl_54 54] +[https://the-moon.us/wiki/R%C3%BCkl_65 65]<br />
 
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<div>You can support LPOD when you buy any book from Amazon thru [http://www.lpod.org/?page_id=591" rel="nofollow LPOD!]<br />
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===COMMENTS?===
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Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment.
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<p><b>Yesterday's LPOD:</b> [[November 17, 2010|A Simple Scene]] </p>
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<p><b>Tomorrow's LPOD:</b> [[November 19, 2010|40 Years Ago Today (Plus 2 Days)]] </p>
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Latest revision as of 18:54, 13 October 2018

Two Ancient Giants

LPOD-Nov18-10.jpg
image by Howard Eskildsen, Ocala, Florida

Here are two large old craters, each crossed by a gash. Do you see them? For one crater you might ask, where is the gash, and the question about the other might be where is the crater? Deslandres is the ~235 km wide crater at bottom right. Its gash, hinted at here and often not seen under other lightings, is the broad, rille-like trough at about the 4 pm position, passing into Lexell. Another gash made of four secondary craters from Tycho is on northeast part of Deslandres' floor. The second giant crater, about 200 km wide and encircling the Straight Wall has sometimes been called Ancient Thebit. The Straight Wall is on a chord - almost a diameter - stretching between the two mountainous ends of Ancient Thebit; to the north, the end of the rim is Prom. Taenarium, and the southern end is smashed by the chain of craters, Purbach H, L and M. Just as Howard's image made visible the putative broad rille at Deslandres, it also graphically points out that the interior of Ancient Thebit is relatively flat mare material, while the mare immediately west is criss-crossed by ridges. The mare material may be thicker within Ancient Thebit, but I don't know why mare ridges are absent there while abundant beyond the rim.

Chuck Wood

Technical Details
Nov 15, 2010, 01:22 UT. 6" f/8 refractor. Explore Scientific lens + 2X barlow + DMK 41AU02.AS + W-15 yellow filter + JMI electric focuser + Losmandy GM8 mount.

Related Links
Rükl plates 54 +65


Yesterday's LPOD: A Simple Scene

Tomorrow's LPOD: 40 Years Ago Today (Plus 2 Days)


COMMENTS?

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