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When you say 'disappearing dot' do you mean a single pixel? If you are then I am afraid you are mistaken in your identification of this object. On those plates a mag 17-18 object will occupy multiple pixels ('circles' comprising no less than 8-12 pixels)
Single 'brightish' pixels are noise that have not been fully removed from the image.
Edit: I ran your positions through some orbit calculators and I should point out that the 3 positions you indicate cannot fit an orbit of any type.
Cheers
Last edited by higginsdj; 05-04-2007 at 08:49 AM.
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