Missions

INMARSAT-4

Mission Profile

From its equatorial launch site at 154 degrees West Longitude, a Zenit-3SL launch vehicle lifted the Inmarsat-4 spacecraft to geosynchronous transfer orbit (GTO), on its way to a final orbital position of 53 degrees West Longitude.

Two-and-a-half minutes into the flight, the first stage of the Zenit-3SL vehicle separated and then the protective payload fairing was jettisoned. Five minutes later, the second stage separated from the Block DM upper stage. The Block DM executed two burns during this mission, with a coast period between these burns. The first burn lasted about 4-and-a-half minutes. The Block DM engine then shutdown and coasted on an equatorial path for a period of 55 minutes. The Block DM then ignited for its second burn, lasting 7 minutes. Following another 10-minute coast, the Block DM separated from the spacecraft an hour-and-25 minutes after liftoff. A ground station at Lake Cowichan in British Columbia acquired the first signal from the satellite about 25 minutes after spacecraft separation

 
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