SUMMARY
The return to normal tracking behaviour following the central bearing replacement can be gauged only by tracking experiments, of which this is one more. This aspect of telescope behaviour appears OK.

Mars was tracked for almost 3 hours with RxA3i, using the fives.icl procedure. The integration time per point was 6s, giving a time resolution of ~100s. Tracking was done :

• from (az,el) = (200,58) at HST 21:12 to (244,30) at 23:57

• There are no obvious systematic problems associated with the old c.b. glitches at azimuths 224 or 240, or with the track joints at 217, 220, 222, 225 (the old big one) and 244.
• Raw rms scatters in (daz,del) are (0.8", 1.2"), which are not much more than the seeing throughout this period : 0.6" at the beginning, 0.9" in the middle, 0.8" towards the end.

In conjunction with the tracking done on 990513 and 990516 , we may conclude this part of the recovery from the c.b. replacement.