A Central Bearing Load check and adjustment was performed during the day. Tomas Chylek reports:

    . . an unscheduled central bearing adjustment was successfully
    performed by EMS and TCH yesterday. The load distribution between
    the central bearing and the rollers has been kept at 85%/15% of the
    total antenna weight. 
    No significant visible or measured changes following the earthquake 
    were detected, and there is only minimal change since the last 
    adjustment. The full results are available

        here.

Inclinometry followed:

    Datasets  El Dirn     HST     mean leg temperatures   Humidity
                          start     start   middle   end       %
  ( 20061017  89  cw      23:16      -         -      -          
    20061018  89 ccw      03:21      -         -      -          )
    20061026  89  cw      16:45      -         -      - 

Data is recorded from the 3 active inclinometers only: there is no strain gauge data, for instance. Engarchive has been unavailable since the earthquake on 20061015 - so no leg temperatures.

• The differences between the (CW) model derived from these new data and the previous model of 17 Oct are shown below :
  
  Click for better image

  The observed changes in the track model are small. No accompanying CCW data are available, so the CW-CCW difference from the previous run were used to generate the hybrid track model. This was installed at HST 19:40 on 26 Oct 2006.

  Subsequent Pointing
  (TSS) Ben reported

     The pointing model is clearly bad tonight, but at least, it seems to be 
     bad in a consistent way. Apparently, UAZ decreases as targets move 
     west. UEL appears to be fine apart from a collimation error. I have not 
     filed a fault or marked any time lost as I believe we have kept up with 
     the pointing changes, and while large, they should not significantly 
     impact the data we have taken tonight.
  

  There is often a change in the azimuth encoder zero-point following this process, which would lead to just this behaviour. However, the 20 logged data taken with RxA during the night are insufficient (in quality and distribution) to allow this change to be well determined. Fitting only the collimation parameters, IE and CA, to the 20 data gave (CA,IE) = (-14.3"+8.4", -6.8"+2.8"), cf. their current values of (0,0). The overall rms error on the sky is 8.9". The (poor-ish) elevation performance is actually no worse in quality to that during much of the last week, and essentially indicates only a zero-point change and that any elevation oscillations [20061023.004] are not a limiting factor in this case. The distribution of errors is shown below:

  

  but is not improved by a full, 7-parameter TPOINT fit, with the rms improving overall from 8.9" to only 6.9".

  A dedicated pointing run appears necessary to resolve this.