(My first post here)
On the night of the 28th December I had a little spare time to take some astrophoto's. I started the night by taking some pictures of Orion. Later, as the sky slowly rotated, a bright star (which I believe is Sirius) appeared. I tried to take some pictures of it just to see how sharp I could get it. But what was strange to me was this comet-trail like thing that appeard above it. First I thought it might just have been a random reflection in the telescope from maybe a lamppost (which there aren't many of here), but then I tried to take a longer exposure (30 sec.) and found that it followed the sky.
The first image is a short exposure and shows the "thing" in sharp edition and the second image is the long exposure and shows that the "thing" moves along the sky and is therefore not a reflection.
[Do not mind the small shake in the end of sirius in the beginning!!!]
Does anyone have a guess of what this might be?