Malcolm Park
The object that appears to move back and forth is Pluto. Two images were taken 24 hours apart, overlaid and blinked to show how far Pluto moves in 24hrs. Above and to the left is probably an Asteroid in one of the frames.
The blue arrow points at Pluto. It shows in the bright image (which I took) but not in the dark image (from the Digitized sky survey) bw=ecause the DSS image was taken long before Pluto got to this position.
