Following the removal of SCUBA2 from the antenna on the 24th Feb, inclinometry was acquired on the 27th. A full schedule, including the production of new pointing model, meant that only clockwise inclinometry was performed. However minimal changes are expected (and have previously been demonstrated) between the clockwise and the counterclockwise components so we have substituted an average value obtained from the previous two inclinometry runs.

   
   Datasets     El   Dirn      HST       mean leg temperatures     Humidity
                              start      start   middle   end          %
   (20090131    89     cw    ~06:30       3.3     3.6     3.9          3
    20090131    89    ccw    ~09:15       3.9     5.0     5.8          8)
    20090227    89     cw    ~17:00       4.0     2.5     1.5          8

The new data are recorded from the 3 active inclinometers and one of the two strain gauge channels.

• The differences between the (CW) model derived from the new data and the previous model of 3rd Feb are shown below:
  
  Click for larger image

• The resulting rms scatters in the differences in (F1,F2,F3) are (1.25", 0.70", 0.65") cf. (0.54", 0.77", 0.72") last time. These higher values are to be expected following the major engineering work required to remove SCUBA2 and adjust the central bearing.

• The CW-CCW profile used is the mean value from 20090131 and 20090103, and is used to generate a hybrid track model which was installed at 20:15 (HST) on the 27th February 2009.

• The symmetry and the strain gauge data for the one remaining channel looks as expected. A plot of the raw strain gauge data clearly shows the reduced loading on wheels 3 and 4 following the removal of SCUBA2.