January 7, 2009

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Whose Rilles?

LPOD-Jan7-09.jpg

image by KC Pau, Hong Kong

Concentric rilles are often the largest and most impressive on the Moon. The best examples are the Hippalus Rilles that arc around the east side of Mare Humorum. KC's regional view shows three or four of these big rilles at bottom left. To the northeast of Hippalus an odd thing happens - the rilles bend around and become concave to the east. The most conspicuous of these right-opening features is named the Agatharchides Rille, but it is really (rilly?) part of the Hippalus family. KC's image also reveals the infrequently seen shallow and fainter rilles near Chuck Wood

Technical Details
Jan 6, 2008. 250mm f/6 Newtonian + DMK31AF03 camera. Lat.: 22º 15′ N, Long.:114º 10′ E; elevation is 0 meter.

Related Links
Rükl plate 53

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