Hi David,
Being a man of many talents and soon to be one more, I'm sure you would be able to work out an asteroids offsets and direction. I believe that maximDL can handle these (in X and Y coordinates). I think it then guides and offsets the guide star to take into account the movement of the asteroid on the image. This would leave the asteroid as a point and the stars 'trailed'.
If the asteroid is so faint, it would require many resets as the guide star will drift accross and out of your guide field several times during the one spectral integration to build sufficient sig/noise ratio. Difficult, but I'm sure it can be done.
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