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Is this a one off experiment or something you want to systematically do? Very few asteroids are going to likely fit your requirements depending on what telescope setup you have. Afocal imaging by hand holding a camera through a small telescope EP that is not tracking will likely limit you to mag 4-6. At the moment there is only 1 target, Vesta, brighter than magnitude 8 (currently at mag 7) but it is at +22 dec so that one is out for the time being. I would suggest that you will need to afix the camera Afocally to a tracking telescope (not just hold it in place) with a remote shutter switch to have any chance at being able to capture it.
For Asteroidal occultation work we use sensitive security type mono CCD video cameras. In my tracking 14" I can "see" magnitude 11 stars and asteroids in the best of conditions with this type of camera solidly mounted to the telescope. If the best you have is 102mm then I would have to say you are likely out of luck....
Cheers
Last edited by higginsdj; 10-04-2010 at 10:12 PM.
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