4 seconds would be a bit too long to image Jupiter. Does the Nikon D80 have a movie mode? Cannot remember my exact settings on the Canon 60D, but I think playing around in the region of 1/64th was a more appropriate exposure time (and then lots of them to freeze the seeing so to speak).
Are you using any kind of EQ mount? You may have bumped the scope during your exposure, setting the camera to delayed capture may work, a count down timer from 10s might be enough to stop any wobbles.
Outside of that, nice attempt, nothing pathetic about it.
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