[hector (Andrew)]

Hi Everyone.
I have recently branched out into Deep Sky photography and I upgraded from an Orion 80ED to the Skywatcher 150ED. The first night out shooing with it on the 29th July and when I stacked my 100 images of CenA I noticed an artefact in the image above the galaxy. I can only describe it as a wobbly line. It almost looks to be like a ghost reflection of the brighter star but the reflection has moved during the exposure. The line almost looks like a repeating pattern, much like a plot of the periodic error of the mount. If you look carefully you can see the same wobbly line across the entire image, just the others are quite faint. The image was taken with a Nikon Z6II at 800ISO and a 30second exposure, 100 images were taken. Any suggestions would be appreciated and better still a solution if people know what it is and how to deal with it. It is also in my shot of 4945 from last night as well, just not as obvious. I used Sequator to stack the images.