Perhaps there IS something at the centre, you just haven't found it yet due to its size?
there doesn't have to be something right in the center of the station's orbit. if there is another object, both, the station and the other object are circling around a common barycenter (see http://en.wikipedia.org/wiki/Two-body_problem)
Black hole maybe?
Never seen one yet but don't they show up as a nav point?
<grins> Or all those elephants that were in the room!Solo/Open and PvP threads.