SOHO Recovery Updates

21 September 1998

On Saturday evening Gyro B was tested and was found to be fine. Gyro C was showing intermittent anomalies in its behaviour. An investigation on this matter is under way. It is worth noting that both gyros with problems, A and C, were warm at the time of the loss of attitude in June while Gyro B was cold.

The roll rate anomaly detection (RRAD) has been tested also on Saturday and it is working fine. The reaction wheels are being kept at 1500 rpm and the roll rate of the spacecraft never surpassed 0.1 deg/s.

Plans for testing of thursters 7 and 8 on the B side, and then reconfiguring the spacecraft to the A side are under preparation.

Luis Sánchez
SOHO Science Data Coordinator
European Space Agency

Last modification: September 21, 1998
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