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Hi Kevin,
I usually load the full set of subs into comet align. Open the first and last sub from within comet align, use your STF to make things visible. Then click on the comet in the first and last sub. This assumes subs were taken at roughly equal intervals. I usually open one or two of the intervening subs to see if the comet has been identified correctly.
It's hard to see what's going on in your image. PI always seems to find the comet when I use it. Perhaps it's an SNR issue.
60 seconds should show the comet nucleus clearly. Images below taken with a 120mm f/7.5 refractor last night. Can't see that things should be much different at 100mm and with a faster focal ratio.
Tel
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