Difference between revisions of "November 13, 2019"

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=Spirelandia=
Originally published June 30, 2010
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Originally published May 31, 2010
 
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<em>image by [mailto:astronomie@robert-blasius.de Robert Blasius] and Timm Kasper, Germany</em><br />
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<em>south up drawing by [mailto:philip.morgan@talktalk.ne Philip Morgan]</em><br />
 
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The Moon had been bad and when it tried to rise, the guardian towers refused to let it pass. The Moon huffed and puffed and got red in the face, but it made no difference, it couldn't rise into the sky. The Sun set and as the night wore on people could see a redness in the east but the sky was unusually dark - where was the Moon? The smugglers who counted on the Moon's light to guide them lost their way. Deep sky observers were delighted by the unexpected dark sky, and hospital emergency rooms had a quite night. When all the people realized that the absence of the Full Moon made life better for the good guys, and tougher for the bad folks, they voted to permanently keep the Moon locked up in the daytime sky. Sometimes you will see it, blue with embarrassment, inconspicuous in the daylight. Rarely it gets so desperate for attention that it moves in front of the Sun, but it quickly regrets its action and moves away into obscurity. After a while people forgot it existed and when they made plans for space exploration only thought of Lagrangian points and Earth-approaching asteroids. <br />
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Did you know that at sunrise Albategnius has more spires of shadow cutting across its floor than any other lunar crater on the nearside? In fact, I don’t really know if that statement is correct since I have never really tried counting them all, but I would think that Albategnius would be one of the top contenders! On this occasion I counted 16 or more, including the spire cast from the great central peak. This large number of shadow spires is due to the plethora of lesser craters that encircle the ramparts of this vast crater, including Albategnius L high on the east rampart, which is a small banded crater. The central peak of Albategnius is slightly off-centre to the west, and is so large that it almost looks like the up-tilted remnants of a once grand crater that has sunk, leaving just a section of its western rampart sticking out. Recent measurements by John Moore give the height of this peak as 1,735 m above the floor. On the very summit sits a small craterlet about 1.6 km in diameter. This is a fine test for the visual observer, requiring steady seeing and the correct lighting for you to be able to pick it out. To the west of the central peak is the crater Klein with a diameter of 44km, with the prominent small crater Klein C on its southern cusp. Just to the northwest of the central peak on the floor I noted a short and somewhat denuded crater-chain together with some low mounds. Due north of Klein on the northern outer flanks of Albategnius is the small crater Albategnius G. This was named Alter by Wilkins and Moore, but the IAU didn’t accept the name for that crater, instead giving it to a far side crater.<br />
 
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
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<em>[mailto:philip.morgan@talktalk.ne Philip Morgan]</em><br />
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<strong>Note:</strong> John Moore has made a synthetic image from digital terrain data to compare with this drawing.<br />
 
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<strong>Technical Details</strong><br />
 
<strong>Technical Details</strong><br />
The most southern moon rise this year. We  determined the right location with the help of GPS and Google Earth to get the exact angle for the moon rising between the towers of the local basilica. Canon EOS 40D, Borg ED 77, 1/50s, f6, ISO 800 - postprocessing with Photoshop.<br />
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May 20, 2010, 20:25 - 21:10 UT. 305 mm f/5 Newtonian X400<br />
 
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<strong>Related Links</strong><br />
 
<strong>Related Links</strong><br />
Robert and Timm's local astronomy [http://www.avso.de/ group]<br />
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Rükl plate [https://the-moon.us/wiki/R%C3%BCkl_44 44]<br />
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Reduced spires [[April_24,_2009|image]]<br />
 
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<p><b>Yesterday's LPOD:</b> [[November 12, 2019|Strike-Slip?]] </p>
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<p><b>Tomorrow's LPOD:</b> [[November 14, 2019|Atlas Perfectibility?]] </p>
 
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<p><b>Yesterday's LPOD:</b> [[November 12, 2019|Color Told Tales]] </p>
 
<p><b>Tomorrow's LPOD:</b> [[November 14, 2019|Remnant of a Ring]] </p>
 
 
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Latest revision as of 05:18, 13 November 2019

Spirelandia

Originally published May 31, 2010 LPOD-May31-10.jpg
south up drawing by Philip Morgan

Did you know that at sunrise Albategnius has more spires of shadow cutting across its floor than any other lunar crater on the nearside? In fact, I don’t really know if that statement is correct since I have never really tried counting them all, but I would think that Albategnius would be one of the top contenders! On this occasion I counted 16 or more, including the spire cast from the great central peak. This large number of shadow spires is due to the plethora of lesser craters that encircle the ramparts of this vast crater, including Albategnius L high on the east rampart, which is a small banded crater. The central peak of Albategnius is slightly off-centre to the west, and is so large that it almost looks like the up-tilted remnants of a once grand crater that has sunk, leaving just a section of its western rampart sticking out. Recent measurements by John Moore give the height of this peak as 1,735 m above the floor. On the very summit sits a small craterlet about 1.6 km in diameter. This is a fine test for the visual observer, requiring steady seeing and the correct lighting for you to be able to pick it out. To the west of the central peak is the crater Klein with a diameter of 44km, with the prominent small crater Klein C on its southern cusp. Just to the northwest of the central peak on the floor I noted a short and somewhat denuded crater-chain together with some low mounds. Due north of Klein on the northern outer flanks of Albategnius is the small crater Albategnius G. This was named Alter by Wilkins and Moore, but the IAU didn’t accept the name for that crater, instead giving it to a far side crater.

Philip Morgan
Note: John Moore has made a synthetic image from digital terrain data to compare with this drawing.

Technical Details
May 20, 2010, 20:25 - 21:10 UT. 305 mm f/5 Newtonian X400

Related Links
Rükl plate 44
Reduced spires image

Yesterday's LPOD: Strike-Slip?

Tomorrow's LPOD: Atlas Perfectibility?



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