Re: orbits..
I'm not sure, but if the object isn't really in an Earth orbit, it's more in a Solar orbit, isn't it? Objects near the Earth, but not in its orbit, orbit the Sun at almost the same speed as the Earth, but because there is a constant pull from Earth's gravity, there's the need for a motor to stay away from Earth's influence.
I never heard about pole-sitter, before. Interesting.
Raoul