It's interesting. When I was younger (and more active as an amateur astronomer) we used a homemade blink comparator to hunt for asteroids/minor planets, which w

It's interesting. When I was younger (and more active as an amateur astronomer) we used a homemade blink comparator to hunt for asteroids/minor planets, which works on this same principle. Do you have the source links for these to determine how much time elapsed between these two images? There is actually another movement in this same image (about 80% down from the top and just to the right of center there is a trio of stars... the rightmost one in the trio moves down and to the left in the higher res photo). Depending on the amount of time between these two images, could be parallax/motion from a much closer star, could be an asteroid or similar object, could be data anomaly, could be lots of things. One thing I know, however... that's no moon.