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Europe's "Jules Verne" freighter is about to start practice docking manoeuvres at the space station.
The cargo truck will test its systems with two close approaches and retreats before finally linking up with the orbiting platform next Thursday.
The ship, which is carrying just under five tonnes of supplies for the station's astronauts, flies under the control of autonomous computers.
The vehicle's performance so far has been exemplary, say space officials.
"We've had the usual small anomalies; we're learning how to fly the bird - but nothing that has been really difficult," said John Ellwood from the European Space Agency (Esa).
Button pressing
Launched earlier this month, Jules Verne, also known as the Automated Transfer Vehicle (ATV), was parked up in front of the International Space Station (ISS) during the recent shuttle visit.
But now that the Endeavour orbiter and its crew are on the ground, controllers have commanded the truck to come back over the platform for two demonstration days.
Jules Verne is designed to make its own way to the platform and complete an automated attachment. Humans will only interfere if something is seen to be going wrong.
But as a new ship, the ATV must prove itself; and the demos will allow for the checkout of all the vehicle's close-manoeuvring systems, including its advanced GPS technology and optical sensors.
The first practice session, on Saturday, will see the ATV move to a hold point just 3,500m (2 miles) behind and 100m (330ft) above the station.
The second, on Monday, will see Jules Verne edge to just 12m (40ft) from the back of the ISS; and, hopefully, aligned straight with the docking mechanism.
The second day will also give the station crew an opportunity to practise their safety interventions.
By pressing buttons on a special panel positioned in the ISS's Zvezda module, it is possible for the astronauts to command the ATV to stop in its tracks and even move away from the station.
Once these operations have been completed, ground controllers will assess the results, before giving the green light to Jules Verne to try a docking for real.
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