I already contacted Ursa, that is a Finnish astronomical association. I don't wanna waste their time more with this since I know they don't have too much time. But I photographed this thing and they said that it might be a cosmic ray. What do you think? They also told me that it's possible to take more cosmic ray photos by adding the camera body plug/lens cap and locating your camera in some dark place for taking a very long exposure photo and in some of those photos there might be a change that a cosmic ray hits your camera sensor. I've not yet tried it but seems reasonable.
I was in Järvenpää when I took the photo.
Based on the Stellarium time and angle of Ursa Major (Big Dipper) it seems like is UTC+3. So 22:45 UTC Aug 7 2019
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