Hi, I wasn’t sure where to post this. Yesterday I was using my new mount with a canon 1000d and 300mm telephoto lens. I was imaging the horsehead neb region. There was nothing visible with the naked eye but when I examined the images on each frame there was a faint object slowly moving across. On each frame the object had moved slightly. Each frame was imaged at 30secs exposure with an iso of 1600. I didn’t time the images but was between 00.45UT and 01.30UT. I’m still away at the moment so no computer to stack, process the images.. of course it could just be a piece of space junk,,lol.
Ella, There are lots of geosynchronous satellites which show up in southern Orion and which can be quite bright near local midnight. The geostationary arc passes below the Horsehead but old, out-of-plane satellites can show up there. These objects trail at around 0.25 deg / minute and appear to move westwards relative to the star background. Here’s an example near M42 from a wider field image.