Hi Ken,
Guiding will be done on an actual star - not the asteroid. Tracking Offsets are then applied to that star and it's position in the guiding 'frame' is shifted by the offset - thus the scope tracks on the asteroid but guides on a star.
Although it would be nice to get mag 16 asteroids I'm really after those in the 12-14 range as these represent the binaries that I am nabbing (H<12, at opposition) and I am really only after enough signal to determine a taxonomic classification.
Cheers
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