possible new at 1500
Harder to tell in this one. It definitely looks like it moves up and to the left between frames 1 and 2. Still, it doesn't help that the image frames are not aligned too well and all stars are also slightly moving in that direction between 1 and 2 as well.
Then in frame 3 there is a point that is to the left of the point in frame 2, but there is also a second point back to the right as well. That second point aligns pretty close with the point in frame 1 if you cycle between 1 and 3.
Then in frame 4 there might be another point to the left of the first point in frame 3, but it is very faint. There also continues to be a second point that matches the second point in frame 3 and even more closely matches the original point in frame 1. This means there is a point that does not appear to move that much between 1, 3 and 4.
So it might be a very faint asteroid moving away from a star, or a star with some image noise around it. Definitely a noticeable area of the image, but still hard to tell.