As I scanned, I noted a crater very far south that showed a narrow ray. After running inside for my Rukl atlas and doing a little crater hopping from the very distinctive Heraclitus complex, I identified the crater as Curtius. Since I didn't recall ever seeing any reference to a ray in Curtius, I finished the setup to take images, and shot several 640x480 images and a few AVI video clips of that region.
Here you see an image (north at top) cropped from the best of the 640x480 images -- this was originally shot at f/13.6 including a 2x Barlow, then converted to grays, auto contrast enhanced, sharpened and brightened in ImageForge. Near the top you can see the Heraclitus complex, and in the oval is Curtius. The limitations of my webcam setup prevent seeing as much of the ray as was visible with an eyepiece; at 108x I was able to see more light extending toward the east crater wall, where a smaller crater interrupts the wall and allows the rising sun to shine through the gap onto the crater floor, creating the ray.
Image Copyright © 2000 by Donald Qualls
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