March 5, 2014
A Little Scar
image by Jordi Delpeix Borrell, l'Ametlla del Vallès (Barcelona) Spain
A new contributor to LPOD appears with an excellent image of Goclenius. The lighting suggests that its floor rises towards the rille that hugs the upper right crater wall, but the LRO QuickMap topographic tool shows exactly the opposite. The pie-shaped part of the floor is about level, but once the upper diagonal rille is crossed the land slopes about 140 m to the east/right, and at the wall rille, it plunges down another 250 m. Our eyes, or at least mine, are often fooled by lighting, and need measured topography to really understand what is going on; fortunately, we now have it. The mare surface east of Goclenius undulates with mare ridges, buried crater rims, and slight swells tens of meter high. One more odd thing - look at the center of Magelhaens, at lower left. Small, slightly bright points looks like a smallpox vaccine scar. LRO's higher resolution shows the same thing. Because it is in the center of the crater it could be the just slightly lava-covered tops of a cluster of central peaks, but it isn't completely convincing that that is what it is.
September/23/2013. C9,25" + Barlow 2X + DSLR Canon EOS 550D. Processed with Registax6.
21st Century Atlas chart 3.
Yesterday's LPOD: Green Rays
Tomorrow's LPOD: Moon Over a Surrealistic World