Missions

XM-1

Mission Profile

The launch of XM-1/Roll successful placed a commercial digital radio broadcast satellite into Geosynchronous Transfer Orbit with outstanding accuracy. The final orbit of the spacecraft is in Geostationary Orbit at 22,236 miles (35,786 km) above the Earth, at 85 degrees West Longitude. The weight of the spacecraft, fully fueled at the time of launch, was approximately 10,297 lb (4,672 kg). The Zenit-3SL rocket lifted off exactly on schedule at 3:10 pm Pacific Daylight Time from the equatorial launch site at 154 degrees West Longitude.

About two-and-a-half minutes after liftoff, the first stage separated and then the payload fairing jettisonned. About six minutes later, the second stage separated from the Block DM, or upper stage. After the first burn of the Block DM engines, the spacecraft maneuvereed a 35-minute coast period. Following this coast, the Block DM made a second burn and then separated from the spacecraft about eleven minutes later, at 1,592 miles above the Indian Ocean. Five minutes after spacecraft separation, Boeing Satellite Systems acquired the signal from the spacecraft from a ground station in Perth, Australia.

 
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