Since a couple of days my StarAlignment refuses to work. When I try to register series of 30 - 40 subs with default settings no alignment can be achieved. First I thought that shifts between frames were to large and I varied settings in StarAlignment. No improvement resulted and I had the idea to align the frames with CometAlignment in a first run. That worked so far, but results were not as good as I expected. I than used these nearly aligned frames as new input to StarAlignment with a mysterious outcome.
In the original series coordinates of a certain star in the first image were 1996, 1434 and in the last 1967, 1432.
After CometAlignment there remained a drift of one pixel in x.
After the following StarAlignment the star was shifted to 1996, 1433, which are nearly its original unaligned coordinates
Ideas welcome,
Udo
