Ariane 5 cleared for Alphasat launch

The Ariane 5 flight carrying the Alphasat I-4A F4 satellite has been cleared for lift-off following a successful launch readiness review.

This milestone confirms that the heavy-lift launch vehicle and its payload are flight-ready, along with the European Spaceport's infrastructure and the network of downrange tracking stations.

With the “green light” given, Ariane 5 is now cleared for its roll-out tomorrow from the Final Assembly Building to the ELA-3 launch zone.

New generation
The rocket is scheduled for lift off on 25 July during a one-hour, 18-minute launch window that opens at 19:53 UTC in French Guiana.

Alphasat – Europe's largest ever telecommunications satellite – is configured with an advanced, new generation L-band geo-mobile communications relay system.

The satellite will augment Inmarsat's existing I-4 broadband network and provide increased capacity for mobile communications across Europe, Asia, Africa and the Middle East.

Alphasat is the result of Europe's largest ever public-private partnership space project, between Inmarsat and the European Space Agency (ESA).

The launch can be watched live at

Watch the launch: