MERSENIUS WEST
image by Oliver Pettenpaul
Mare Humorum and Orientale are such compelling targets that the region between is often overlooked. Oliver has resisted that urge and captured a wonderful image of this complex area. The jumbled texture between the craters is ejecta from the formation of various basins, with that from the Humorum Basin being buried by debris from Imbrium and then Orientale. Some of the isolated mountain masses are probably segments of the basin’s rings. At bottom right is a pond of lava captured between the Humorum mare-edge ring (diameter 425 km according to Paul Spudis) and the next one out. This mare patch is cut by linear rilles whose directions seem unrelated to Humorum basin structure. One rille peters out in the basin debris between Mersenius (top-right) and Cavendish (bottom-center). The nearly twin craters once named for the 19th century Henry brothers are at far left. The main focus of attention though is Mersenius, whose floor is rarely imaged so clearly. The rilles have an odd distribution, being mainly on the western half of the floor - I wonder why?
Chuck Wood
Technical Details
2007-12-21 22:16 UT. 9.25″ Celestron XLT + Televue 2.5X Powermate + Astronomik Red type II filter + DMK21AF04.AS @60fps, 632 frames used, 12 point auto MAP processing.
Related Links:
Rükl plate 51
Oliver’s website
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Just a few days ago, I received my copy of Sky & Telescope’s “Field Map of the Moon” featuring illustrations by Antonin Rukl.
This map is very useful when viewing LPOD images. It not only helps to positively identify craters and other features, but also adds perspective by showing exactly where these images are located on the Moon. The “Field Map of the Moon” is well worth its modest price! It can be purchased from Amazon.com.
Mersenius appears to be flooded with lava. Is it considered a walled plain?
–Bill
Comment by Westwind — January 7, 2008 @ 10:35 am
Bill - I use the field map every day when writing LPOD - its a great accompaniment!
Walled plain is terminology from the 19th century. It is no longer used. Mersenius is a somewhat degraded complex impact crater. It is filled with smooth material which very well be volcanic, but if its not dark at full Moon its not mare lava.
Chuck
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