Beaver Moon 2023 (Jeremy Likness)

Beaver Moon 2023

Acquisition type: Lucky imaging

The full moon in November is called the Beaver moon. I love capturing full moons and believe this is one of my most detailed. I captured 100 frames in red, green, and blue channel, but even with a reducer my Celestron focal length wouldn't fit the entire moon. So, I captured the bottom 4/5ths and the top 4/5ths. For some reason I haven't figured out, SharpCap never saved the green channel for my "upper" moon. It was just about 1/5th of the image. So, here's how I attacked it:

1. Used AstroSurface to stack and sharpen R-top, R-bottom, G-bottom, B-top, B-bottom
2. I resized the top and bottom to provide space to create the full disk
3. Using AstroSurface's alignment tool, I aligned the top and bottom halves to overlap using R-top and B-top as a reference so I have R-bottom-aligned and B-bottom-aligned.
4. Ran a simple PixelMath to combine halves: max($T, R-bottom) for R-top and max($T, B-bottom) for B-top. I saved these as R-full and B-full.
5. I decided to reconstruct the G channel based on statistics from the R and B channels. I know there are more advanced functions but I kept it simple and assumed there is a constant "rg" such that r * rg = g. Furthermore, there is a constant "bg" such that b * bg = g. So given an existing red or blue channel, you can get a g value. Now, to solve for the factor, we divide to get: rg = g/r. But we don't have g, so we'll take mean(g) instead. Now we have rg = mean(g)/r. We're also looking at ratios, i.e. how much of r or b exist. Given that, I believe the equation I used was ultimate mean((mean(g)*r/mean(r)),(mean(g)*b/mean(b)) or something similar. Whatever it was, it worked. It looked like a perfectly full moon to me so I ran with it.
6. Aligned red full, green full, and b full in AstroSurface
7. Used PixInsight to combine and post-process.

I hope you enjoy viewing it as much as I enjoyed creating it.

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Backyard
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Astrometry.net job	n/a
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