Moon in Twilight Experiment 2 (Steve Lantz)

Contains: Solar system body or event

Moon in Twilight Experiment 2

This is my second experiment with converting a lunar image (waning gibbous) taken in relatively bright twilight to a dark sky background. The 15s video from which the final image was drawn was taken at 7:02 MST 4/11/2020 in very poor seeing. Rather than using a lucky capture algorithm, I manually scanned through the video and selected the very best frames, of which there were only four, to stack. In Photoshop, I created a background sky frame by using the color sampler to sample the blue sky and then the brush tool to paint an entire frame that color. One channel (RGB) at a time, I used the difference algorithm in the image calculations menu to obtain the difference between the respective R, G and B channels of the stacked moon frame and the sky background frame and used the three results to create an RGB, R, G, and B set of channels for a color image. I converted this to black and white and processed the dark sky image from there. The video was taken with 0.0025s exposures at about 64 fps.

The final image shows Mare Tranquillitatus (above) and Mare Nectaris (below). The mostly vertical black streak to the left of Mare Nectaris, Rupes Altai, is of interest in that it is the best preserved remnant, a crater rim, of the ancient impact basin in which the mare later formed.

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