February 18, 2010

Divergent Tracks

image by Paolo R. Lazzarotti, Massa, Italy

Hansteen (top) and Billy (lower) are the same diameter (45 km) and have very similar narrow inner walls. But the similarity stops there. Billy has a lava-covered floor (making it a dark spot at full Moon) and only a few small slump masses around the edges of its floor. Hansteen has broad piles of debris that fill the southern half of its floor, and slump blocks have slid down its northwestern wall. On Lunar Orbiter IV Chuck Wood
This is a repeat of a classic LPOD, but I didn't record the date!

Technical Details:
11 January 2006, 315 mm Dall-Kirkham Spada telescope (f/25), Lumenera Infinity 2-1M camera, Edmund Optics G filter IR blocked, 160 frames stack out of 2500.

Related Links:
Rükl plate 40
Paolo’s website
Billy spooted by ESA

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