As I said on the previous page, "Perhaps the target drifted to the left because it was 8 degrees to the left of the F-18, but then again, it was also 5 degrees above the F-18 yet it didn't drift up at all."
I was thinking of a stationary object that drifts due to the F-18's forward motion, but you're right that the object was always moving left.
It took 35 seconds (112 to 147) to go from 0 to 8 degrees left, or 0.23 degrees per second.
The NAR field of view is probably 0.7 degrees, as I mentioned in post #117.
When the lock broke, the object took about a second to move a quarter of the FOV, or 0.175 degrees, which is in the ballpark of 0.23 degrees. If it took 0.76 seconds, it would be right on the money.
You can see the object trying to drift left multiple times in the video, like after switching from TV to IR mode, but the tracker manages to reacquire and re-center it, but in the end it loses it. So the object is moving left the whole time at about 0.23 degrees per second.
The object looks asymmetric to me, like the left end is pointy.
There's info about the autotracker in SPIE and patents.
http://dx.doi.org/10.1117/12.472591