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.