February 22, 2009

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Mystery Lines

LPOD-Feb22-09.jpg
image by George Tarsoudis, Greece

Sinus Iridum is one of the most beautiful landforms on the Moon, and George's view brings out morphological features I hadn't paid enough attention to in the past. Ignore the mare ridges on the bay's floor, and the slump mounds along the bottom of the wall. Instead look closely at the region between Bianchini (cutting the Jura Mountains and full of shadows) and Maupertuis (upper left disfigured crater). I see two linear features. First is a trough-like depression that runs from Promontory Laplace (near Maupertuis) to La Condamine (smaller shadowed crater left of Bianchini). This is incomplete, but definite - see Mike Wirth's opposite illumination Chuck Wood

Technical Details
Feb 5, 2009, 19:25:43 - 19:33:11 UT. 10 inch at f/6.3 Newtonian, DMK 21AF04, barlow 3X, red filter, Registax v.5 beta, seeing 3/5.

Related Links
Rükl plate 2 & 10
Jim Mosher's lighting study of Iridum.

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