This was taken with a PST mounted on a NexStar 4SE in alt-az mode with a DMK 21 camera. Capture and autoguiding in DSSR, stacking in AviStack, animation in DVS. Video was captured in 20 second clips at 60fps over a period of 44 minutes. Playback rate is 500x real time.
A remarkable amount of activity for such a short period of time. Right click on the video to turn on looping.