Originally posted by sonhouse
What does the rotation of the planet have to do with it? It could just as easily be spinning opposite to the movement of the satellite in which case the next corner point would be coming in that much faster not receding from the orbiting vehicle. Another way of looking at it would be this: suppose you have homogenous spheres, 4 of them orbiting around a com ...[text shortened]... ntually, except for the poles which may be at too shallow of an angle to see surface features.
The rotation has to do with it because the center of mass tells us that even though the orbiting ship may be coming very close to one of the pointy cube bits during a pass of its orbit, then the other parts of the cube must be getting farther away, and they are getting farther away in exactly a manner such that the additional nearby gravitational strength of the close pointy bit is perfectly balanced by the weakening distant gravitational strength of the far away pointy bits, and it must be perfectly balanced because that's what orbiting the Center of Mass means. If an imbalance was detected, that means by definition that the orbiting spaceship must not be orbiting around the Center of Mass, and that is a case we aren't considering because we already know that would cause problems.
In your example of mutually orbiting bodies, you have introduced an entirely different problem. With the cube we are considering a fixed body, and in the case of a cube with a spherical section removed, we should only consider the case where the remains of the cube continue to hold fixed points in space because only in that way can you have a fixed Center of Mass, which holds true with the original example of a cube planet in our discussion. With your example, your mutually orbiting bodies may have the same mass concentration as the cube, but you've suddenly introduced the possibility of a spatially non-fixed Center of Mass. That would be an example of the classic N-Body Problem in orbital mechanics, and that is not the same problem proposal as the original post in this thread. So, if for example, the spaceship was in a stable circular orbit around the cube, and the cube suddenly transformed into multiple mutually orbiting bodies, that system would not have a stable fixed Center of Mass and the dynamics of this new system would mean most orbits by a relatively close observing spaceship would be unstable/chaotic ... BUT, if you were saying that hypothetically these mutually orbiting bodies somehow kept a constant fixed Center of Mass that was fixed and equal to the original Center of Mass of the cube, then the orbiting spaceship would have no special concerns; it would simply orbit the fixed Center of Mass of the system at a reasonable distance to avoid collisions with the mutually orbiting bodies, and observe a fascinating dynamic system.