This command, available only when a stacked image is currently selected, allows the user to specify a new motion vector (speed and direction of motion) used for stacking the individual images, using the Coordinates, Tracking and Stacking Dialog Box. This command can be useful if there is more than one object (with different speed and/or direction of motion) on the images, or if the original motion vector turns out to be slightly off (resulting in a somewhat trailed image of the object).
The center coordinates used for the astrometric solution can not be changed.
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