On , Webb arrived in French Guiana from California on board the MN Colibri, which sailed the Panama Canal. Though the telescope weighs only six tonnes, it is more than 10.5 m high and almost 4.5 m wide when folded. It was shipped in its folded position in a 30 m long container which, with auxiliary equipment, weighs more than 70 tonnes.
The European Spaceport's preparation facilities are ready for Webb's arrival. Teams will prepare the telescope and the launch vehicle, an Ariane 5 rocket, and then join the telescope with its rocket for a momentous liftoff. Ariane 5 is well suited for science satellites with proven capability to send missions to the second Lagrange Point (L2). Ariane 5 will release Webb directly on a path towards L2 on which it will continue for four weeks, eventually arriving at L2, which is four times farther away than the Moon is from Earth.
Webb is an international partnership between NASA, the European Space Agency (ESA) and the Canadian Space Agency. ESA was responsible for the development and qualification of Ariane 5 adaptations for the Webb mission and for the procurement of the launch service. Canada contributed Webb's Fine Guidance Sensor and one of its four science instruments called NIRISS.