Got a station in Minmus orbit at an altitude between 20km/22km PE/AP. That station is experiencing some weird phantom forces and starts to rotate once you focus on it. Also its periapsis is oscillating, although decreasing in the long term. (trim is off)
Heard that there is a threshold at which physics change from a reference frame which is centered on the celestial body (a co-moving rotating reference frame) to a reference frame which is not moving with the celestial body. At Kerbin that height is 100km which is why it is a bad idea to put a station at that altitude as it will experience such phantom forces. The station is at least rotating around two different axes at two different speeds.
Now, I am interested in Minmus: At which altitude does the change of the reference frames occur there? Any chance it is 20-22 km?
Well, or did anybody else solve this problem anyhow?