A very good point, but I am not entirely sure that this telescope isn't tracking as the ball it is mounted on appears to have rotation in any axis and the 'bars' on the front are not aligned vertically or horizontally but at an odd angle which might suggest it has been tracking???
There are plenty of other faster moving objects at the Research facility such as the 'radar' like object and two antennas on a tall mast.
Of course it may not be tracking at all in which case your sky arc point is very good thinking well worthy of a biscuit or two [big grin]
I have also added an arrow and circle around the red nebula if it makes it easier to spot and ID