Today’s dual-payload launch of Arianespace‘s heavy-lift Ariane 5 mission will carry Japan’s JCSAT-10 commercial telecommunications satellite in the upper payload position, while the French Syracuse 3B military relay platform is installed in the lower passenger slot.

Liftoff of the Ariane 5 is set at the opening of a launch window from 7:15 p.m. (local time in French Guiana) to 8:52 p.m. Deployment of JCSAT-10 will occur at 27 min. into the mission, followed about five minutes later by the separation of Syracuse 3B.