<https://stargazerslounge.com/topic/310043-has-anyone-seen-this-effect/#comment-3390960>
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"Moonlight gradient is my bet, I also see it a lot with LP here.\n \n\n\n\tOur friends with glorious skies won't see it.\n \n\n\n\tI find that on my initial stretch of such stacks you can vary the position and definition of the line quite easily in DSS, I don't know why stretching in DSS gives such a striking cutoff, but it can.\n \n\n\n\tRaising the background enough that it is all 'grey' seems to be the best strategy, then in PS lift the black point and apply gradient exterminator.\n \n\n\n\t \n \n\n\n\tEdit - Rosette is half the distance from the moon that M42 is and by the look of it the direction to the moon is at 90 degrees to the band.\n \n\n\n\t \n \n\n\n\tAlso moon is showing a halo tonight, could it be a 22 degree halo?\n \n"
<https://stargazerslounge.com/topic/310043-has-anyone-seen-this-effect/?tab=comments#comment-3390936>