Unknown Object

[festoon]

Was looking through my imaging subs the other evening (from 10/02/21 between 23:09 and 23:14 Uk time - location Cambridge, UK) and saw what looked like what I thought was a satellite.

The subs are 10 seconds long and animated in this GIF

I was intrigued to look on sky safari as what I was looking at - because it took approximately 5 mins to cross my field of view - rather long I thought for a satellite. However, no satellite/object is registered as passing on that date or time.

Any ideas/suggestions?

[Paul M]

Looks like a geostationary satellite. It's fixed but the tracking mount creates the motion. Can't confirm any particular satellite. As you can see the geostationary belt passes just south of the track of your. I highlighted the nearest object SES-6 to show it's track. The other green dots are other geostatinary sats. Some are placed in parking orbits just out of the plane and many military sats orbital data in't published.

This was the scene from SkySafari for your approx location.

[festoon]

Thanks @Paul M.

I did see in Sky Safari SES-6 and the nearby USA 170 but thought they were too far away from the actual path to be them. 
I guess the satellite paths are accurate?

I had never thought before that military satellites would not have published data...so this could very well be the mystery object!