Hi Malcom
Registax can be set to track the object assuming it's within all the frames you wish to stack. In my Jupiter avi Jupiter started in the middle but drifted to one side. I used the align box just big enough to surround Jupiter in a frame I thought was a better one and registax followed it right to the edge. You don't need to include the moon in the allign box as it's just a frame of reference to my understanding used to align portions of the image to stack
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