Inmarsat provider of global mobile satellite communications services, confirms the successful launch of Alphasat, the largest satellite, designated I-4A F4. Alphasat was launched on an Ariane 5 ECA, the latest version of the Ariane 5 launcher, from the Guiana Space Centre in Kourou, French Guiana at 20.54hrs BST on 25th July (16.54hrs Kourou local time). Arianespace confirmed a successful spacecraft separation at 27 minutes 45 seconds after launch and the Alphasat Mission Operations Team confirmed telemetry reception and that they have command of the satellite at 21.47 BST.