ASTAP version 0.9.84 has a new option, manual alignment. This option is intended for moving object like comets.
This option allows alignment of the images based on a single star, asteroid or comet. If this option is activated, the list of images in the image tab turns red. Double click on each image in the list and click on the star/comet of asteroid to be used as reference. This object is then marked with a little square. The position will be auto centered. (and the X,Y position will be added to the list) If all images in the list are turned green, so contain a value, then click on the stack button.
For objects which are moving in the sky, select the stack option "average" and not option "sigma clip".
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