Asteroid Zoo Talk
Definitely something there. Moves in a strait line and consistently in all images.
The spacing of that white dot is consistent with the white line running up and down on the left hand side. Seems more like a camera issue.
An asteroid should move in a strait line in all 4 images. These images are taken at night so any change in lighting can cause issues.
Looks like reflection or lens flair. Change the order to 2, 1, 4, 3 and it could be a dew drop on the camera lens as well.