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Hi Troy,
What I do with satellite trails that won't reject out cleanly is draw a white line (value 1.0) over them with the PixelMath d2seg() function. That makes them reject nicely without having to push the rejection parameters too hard and take out good data with the bad. The same thing should work for your asteroid but it would probably be easier to make a white image and CloneStamp copy it over the asteroid in each of your subs.
Cheers,
Rick.
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