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You didn't give us much info to go on. Reading between the lines, it sounds like you didn't use a long telephoto. If you used a filter you'll have lots of little white disks on I think you'll have to align them all manually. If you took images with a filter so that you have lots of little white disks on a black background. This isn't enough for a stacking program to lock onto and there is no angular reference for the de-rotation.
So you'll probably have to stack them manually.
Joe
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