1. An object positioning system comprising: an object to be positioned; a measurement system with one or more sensors configured to measure the position of the object in one or more degrees of freedom relative to a reference, wherein each of the one or more sensors of the measurement system has an associated measurement area on the object of which the position in one or more degrees of freedom relative to the reference is measured and wherein a location of at least one measurement area on the object is dependent on the position of the object in at least one degree of freedom; an actuator system with one or more actuators configured to position the object; a control system configured to drive the actuator system in dependency of an output of the measurement system and a set point representing a desired position of the object, wherein the control system comprises an observer with a dynamic model of the object to estimate an internal dynamic behavior of the object based on an input to the object and the output of the measurement system, wherein the dynamic model includes a dependency of the location of at least one measurement area on the position of the object in at least one degree of freedom, and wherein the control system is configured to drive the actuator system in dependency of an output of the observer.