Yesterday morning I caught something crossing my frame that I'm trying to identify while imaging Markarian's chain. Each frame is 60s, so it took roughly 5 minutes to cross the field of view and pulsed in brightness over a 120s period. The frames are approximately 1*57'x1*20', according to Stellarium (ASI294 chip behind a 560mm scope). The first frame was taken at 02:07:11AM and the last frame at 02:11:17AM, pacific standard time. I checked this time period in Stellarium and didn't see any satellites there, but I'm sure there are better sources that I'm not familiar with. I suspect something tumbling in space as that would explain the shifts in brightness... perhaps a spent rocket stage? These are screencaps of the unprocessed subframes but I can provide the FIT files if those would help.
Thanks in advance! And if there is a better forum I should be asking this in please let me know, I wasn't sure.
Edit- Forgot to mention that these were taken from St Helens, Oregon, USA.
Edited by ravenhawk82, 16 April 2021 - 09:02 PM.