real money slots casinos Payment Methods for US Customers casino slots usa internet casino links best online casinos 2013 no limit deposit and fastest payouts top casinos for real money sic bo online game meilleur casino en ligne bo argent reel

April 6, 2006

MICRO-TOPO

Filed under: , , — chuckwood @ 12:01 am

Alph+Ptole-
image by Mike Wirths

When I read Mike Wirth’s email that he was sending an image of Alphonsus and Ptolemaeus I thought it would be a good shot, just like a number of other good shots that LPOD has used. I was wrong. It is good, but like the very best LPOD images, I - and I hope you - learned quite a bit new from studying it. Ptolemaeus is well known as a relatively flat-floor crater with saucers - probably buried craters. This image shows more variation in the micro-topography of the floor that I have noticed before. In the version of the image below (that I strongly enhanced) you can see low relief areas that suggest the fronts of flows - lava flows or ejecta surge flows? The floor of Alphonsus also shows surprises. The eastern side is smooth and crossed by numerous rilles (and notice the volcanic dark halo crater at bottom right) but the west half is covered by textured debris. Even excellent images at higher Sun angles fail to show this rougher floor. Its existence explains why the rilles only exist on the eastern side of the floor: they are buried on the west side. Nobody knew that.

Chuck Wood

Alph+Ptole-B

Technical Details:
March 8, 2006. 18″ Starmaster dob, 2.5X’s Powermate barlow, R/IR True Tech filter, Infinity 2-2 camera, 150 frames out of 1100 Done in Registax 3 and Photoshop CS/ Images Plus.

Related Links:
R√ľkl chart 44

Comments (2)

&uot

Powered by WordPress