Just re reading your post Adam , while I admire your attention to detail and can understand why you want precise TLEs , I think your approach to imaging ISS this way may be over complicating things. As you are imaging in the night sky then obviously you can see the target (ISS ) or indeed any visible sat. The key to imaging these fast moving satellites is to ensure that your viewfinder is precisely calibrated to the OTA . Then avoid the temptation to chase the object but instead set the cross hairs ahead of the satellite , manually ( Both axiis free to move )and wait for the satellite to trickle through the centre of the crosshairs.Then move on and repeat the procedure across the sky. This will have exactly the same effect , but give you far more chances of catching the three frame sequence. This proves a satisfactory technique even when imaging with a much smaller FOV than 8x6 To demonsttrate this I have created a new page on my site . http://satcom.website.orange.co.uk/ On the far right of the menu bar is the "ISS in daylight" tab , click that to see a larger video of a daylight capture.It shows the three/four image sequence you are attempting to grab. In daylight we have no option but to preset the telescope as we cannot see the target approaching....or indeed at all.But in darkmess , bearing in mind we few enough good imaging passes of the station it would be a shame to limit your imaging session to just three frames. Hope this helps John ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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