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Seeing that Agena/Hadar/B-Cent is a bright star, it will register on a chip MUCH faster than much fainter stars, that WON'T show as quickly. Hence, if the mounting system is disturbed - however minute - in the early part of exposure it WILL show, whereas the less bright stars will take longer to register, or the registration of movement is not very noticeable. I also suggst the mounting system had started to settle when the satellite image was recorded - again apparent because of the brightness of it.
Considering the light trail is focalised on B Cent, it is definitely light source. I can guarantee B Cent just didn't go wandering arounf that much for a 20 sec exposure...
Please, oh please no one start suggestion UFOs... :ROFL:
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