An "anomaly" that appeared in the rocket during final checks prior to take-off on Monday had already forced the European Space Agency to postpone the launch of the Ariane-5, which will carry the nearly six-tonne Anik-2F satellite.
Weather conditions over the launch site at Kourou, French Guiana, were to blame for Thursday's cancellation, Arianespace said at its headquarters at Evry near Paris. A fresh attempt was scheduled for 0044 GMT Saturday.
Built by Boeing Satellite Systems (BSS) in El Segundo, California, Anik-2F is to provide telecommunications services across North America for 15 years for the Canadian operator Telesat.
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