SUMMARY
CW Inclinometry was taken during the afternoon of 26 May 2000. There are small (1" amplitude) differences since the last run on 22 Apr 2000 , with some indication of the track segment pattern seen in the residuals.

The CW -vs- CCW performance of the antenna remains little changed since this time last year.

   Datasets     HST start      mean leg temperatures   Humidity
                               start   middle   end       %
 ( inc000422 cw   11:50         5.5     6.8     7.7      20 )
   inc000526 cw   17:30         1.9     1.9     1.7      80

The difference between these clockwise models is shown below :

• The differences in the (F1,F2,F3) have rms scatters of (0.56", 0.29", 0.45") cf (0.37", 0.49", 0.79") previously.

• The new track model was installed at 06:00 HST on 20000530.

• The symmetry remains good : see the plot .

• The difference between models created using the CW and CCW data is shown below :
  

  These data can be compared with those taken on 22 May 1999 . The pitch(F3) and roll(F2) differences are again very small (0.6",0.3" rms) while the +2" track-segment related differences in yaw(F1) have maintained the same amplitude although there appears to be a phase change in the modulation.

  The difference between these CW-CCW differences is shown below :

  

  The spike arises in the 1999 data, and otherwise the CW-CCW difference compares well with earlier measures. The need for a CCW track model, hybrid model, or togglable model still exists.