SWAS Spacecraft
The Submillimeter Wave Astronomy Satellite
(SWAS)
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    SWAS Spacecraft Pages Index
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    The SWAS Spacecraft




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    SWAS is a three-axis-stabilized, stellar-pointed observatory with a pointing accuracy of 38 arcseconds and jitter less than 19 arcseconds. Attitude control, including pointing and nodding, is accomplished by using three magnetic-torque coils, one digital Sun sensor, six coarse Sun sensors, four reaction wheels, one magnetometer, three inertial gyros and a high accuracy CCD star tracker. The SWAS instrument weighs 102 kg and attaches to the top of the spacecraft structure as a single module. The total observatory mass is 288 kg.

    Four deployable, fixed solar panels and one body-mounted panel contain 3.4 m of solar cells. These provide the spacecraft with 230 W of orbital average power. The orbital average power consumption of the spacecraft hardware is 150 W while the instrument consumes 59 W.