Arianespace has announced the launch window for the Ariane 5 rocket scheduled to carry the Yahsat Y1A and Intelsat New Dawn beginning at 2:37 PM Phoenix time and ending at 3:41 PM (2137 to 2241 UTC), today, 22 April, 2011.
Previously, on 30 March, the launch was aborted after the main engine had been ignited. The abort wascaused by one or more components attached to the engine nozzle that prevented the nozzle from moving freely during ignition.
The Yahsat Y1A, is based on EADS Astrium’s Eurostar E3000 platform, and its communications payload, which is designed to operate in Ku- and C-bands, was supplied by Thales Alenia Space. Once in service, Yahsat Y1A will be utilized by the Al Yah Satellite Communications Company to provide customized relay services for government and commercial sectors in the Middle East, Africa, Europe and Southwest Asia.
Intelsat New Dawn, which was developed for a joint venture consortium led by Convergence Partners and Intelsat, also carries Ku- and C-band transponders. Produced by Orbital Sciences Corporation, Intelsat New Dawn is the first-ever African private sector communications satellite, and was conceived to supply critical communications infrastructure for African customers – delivering wireless backhaul, broadband and media content, which are among the fastest growing satellite-based applications in Africa.
At 8:10 AM, launch is a little more than six (6) hours away. Arianespace will cover the launch live, beginning at 2117 UTC.
At 21:27 UTC, we are 7 minutes from launch. The automated sequence has taken over.
T-minus 60 seconds.
Two minutes down range.
At 9:30 into the mission, we have Main Engine Cutoff (MECO) and the second stage has begun its burn. All systems are nominal.
At 13 minutes into the mission, the velocity is 7.5 kilometers / second. The velocity at the end of the first burn of the second stage will be 9.3 km / sec.
21 minutes into the mission, the spacecraft is moving at 8.7 km / sec. Altitude is beginning to increase rapidly now, with the altitude at 300 km.
At 25:30 the second stage has shut down. Altitude is 800 kilometers and a velocity of 9.33 km /sec. The coast phase is underway, and the two satellites will be released over the next ten minutes.
Yahsat Y1A has separated at 28 minutes.
30:00 minutes into the mission, the altitude is 1450 km and the velocity is 8.7 km / sec.
The Intelsat New Dawn has now separated. Mission velocity at 35 minutes is down to 8.0 km / sec, but the altitude is 2400 kilometers.