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lunartic65
sage
Reged: 12/26/06
Posts: 339
Loc: Dublin Ireland
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Hi there
The moon was high in the east so I turned to it. Skirting the terminator at 206X I stopped at Sacrobosco and there was a fat W shape at the base of the crater formed by the shadows of the surrounding terrain, it looked a little like a worm. It was so obvious, I have heard of the lunar X and now I believe that I can add a W. The observation took place at 00.25 UT on 21st August 2008.
Can anyone confirm this observation?
Many thanks.
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Paul
Four weddings and a funeral, where's the difference?
Al Bundy
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67champ
sage
Reged: 07/03/06
Posts: 329
Loc: Ohio, USA
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I've not noticed that before. I'll be on the lookout...
Thanks.
dt
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"To the Moon!"
Orion 127mm Mak-Cass
Meade 60mm Refractor
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Jim Mosher
sage
Reged: 05/22/06
Posts: 234
Loc: Newport Beach, CA
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Quote:
Can anyone confirm this observation?
Paul,
I'm slightly puzzled as to whether you mean 00:25 UT on August 21 or August 22; and what you mean by the "base of the crater" (north up, south up, or some other angle?).
On August 21, Sacrobosco would have been rather far from the terminator. With a sun angle of +16.8° from the west, the shadowing shouldn't have been very strong. That's only about 1° lower than the sun angle depicted in Consolidated Lunar Atlas plate F9, which should, therefore, be quite similar to what you were looking at. The west rim of Sacrobosco (the irregular crater to the left of center with three small craters on its floor) has a kind of W-shape, as it does at most sun angles.
On August 22, Sacrobosco would have been much closer to the terminator with a sun angle of +5.6°. That's about 0.5° lower than in Consolidated Lunar Atlas plate F11, which again should be very close to what you would have seen if you were looking on that night. The west rim of Sacrobosco continues to display its characteristic W-shape, in this case accentuated by shadows; and there are some larger W-shaped patterns of light along the terminator.
Are any of these what you mean by the Lunar W?
-- Jim
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