A lot of books describe the limb darkening but I’ve never seen it actually plotted. So I thought it might be fun to see what it looks like. Since the images were taken through a deep blue filter the darkening should be more here than at longer wavelengths. Since the shorter wavelengths scatter more. (Might be interesting to try this as different wavelengths to see if the theory matches the observations…)
At the edge the value of pixels is 37.5% of the centre.