Performs automated astrometric corrections
This primitive is suitable for optical imaging instruments.
Processing only occurs when the steering header ADD_ASTROMETRY is true.
Processing occurs on the current Group object.
Astrometric correction will probably fail if fewer than five objects are detected in the frame. Should this occur, the original WCS will be retained.
Should an astrometric solution be found, the WCS in the current Group will be overwritten with the solution.