November 16, 2014

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An Image To End All Images (Almost)

image by Richard Bosman, Enschede, Netherland

This is what I am going to miss most about LPOD: coming across, on an amateur image, features that I have never noticed before. Richard's excellent image looks like it came from lunar orbit, a far cry from the first LPOD image. The entire image includes the favorites of Alphonsus and Ptolemaeus, but what attracted me is the fresh perspective of the odd terrain between those large craters and the Nectaris Basin, off the image to the right. The Imbrium sculpture slashes across the western half of the view, with nearly parallel chains of basin secondaries pointing bask toward the basin. But what immediately caught my eye was the much more delicate linear feature (1 on the annotated image at left and extending across the northern rim of Donati - Don) that at first looked like a possible image seam. But LRO QuickMap confirms that it is there, as well as a parallel feature on the smooth material to the north. I assume these are old secondary crater chains, but from where? They point towards Arzachel, and beyond that Kepler. But I would think that secondaries from those craters would be fresher. A much fresher, nearly parallel band of secondaries (2) is about 45 km to the north. These are fresh enough, and aimed in the right direction to be from Kepler. The next feature of interest is the floor of Airy. Richard's image clearly shows the rille-like troughs that cut the floor; LRO does too. I don't think this is a floor-fractured crater but these may be cooling fractures in Imbrium Basin ejecta. Just south of Airy is a bizarre old crater whose floor contains remnant high-standing terrains. If this were Mars we would simply think it is another relict feature eroded by flowing water or perhaps wind. I don't what caused this lunar feature. Burnham (Bur) has a somewhat similar floor. Now to a strange 15 km wide, 1 km high hill, just north of Airy B - is this a piece of an ancient basin rim? Although there are many intriguing landforms here - do you see the small simultaneous impact craters? - I want to mention just one more that I hadn't noticed previously. Labelled 3 is the edge of what looks like a thick flow (Imbrium fluidized ejecta?) against higher terrain that is cut by three remnant rilles. This is most odd.

Getting back to the first sentence of this LPOD. I have decide to stop publication of LPOD on December 31, 2014. That day will complete 11 years of activity, with about 4,000 LPODs. I am not tired of the Moon, and today's wonderful image illustrates that there are more things to be discovered, but I won't be doing it. I have spent about 8,000 hours creating LPODs - that is almost four years of full time work. I have been faithful to the task, night after night. But now I want to write other things - to finish my historical novel and other books (including some Moon ones) that have been delayed by the nightly pressure for LPOD. And my involvement in politics grows - I must be getting senile - but I enjoy it and it is important. I request help from LPOD readers and contributors to finish the year. From December 1 through December 31 I would like to reprise wonderful LPODs from the 11 year history. Please send me emails with the date and urls link of great LPODs that you think are worth being in this special commemoration of all the imagers who have made LPOD possible. And keep sending me new images for possible use over the next 14 days. Thanks.

Chuck Wood

Technical Details
C14 and Basler Ace 1300

Related Links
21st Century Atlas chart 13.
Richard's Astro Fotografie website

Yesterday's LPOD: Motion Sickness?

Tomorrow's LPOD: Ejecta Deposits


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