As was discussed in the 20090302 report, the data for the current RxA pointing model was taken during unstable grade 4 weather. Nevertheless, the removal of SCUBA2 forced the model update and it went on to perform well before a long spell of bad weather prevented further observations.

20090313
A dedicated pointing run was carried out in which 30 data points were collected over a period of 3 hours on 13th March (UT). The weather during the run was stable grade 2 (see here). Fitting this with the existing model gave residuals (dS,dZ) of 1.5, 1.8" respectively.

   UT Date     FE     No.    CA  +- dS      IE  +-  dZ
                               (daz)          (del)
   20090313    A      30   +0.78 +- 1.5    +1.1 +- 1.8 
 

Using this new data a full 7-parameter fit with TPOINT was carried out, this gave improved residuals (dS,dZ) of 1.2, 1.6" respectively.

   UT Date     FE     No.    CA  +- dS      IE  +-  dZ
                               (daz)          (del)
   20090313    A      30   +14.7 +- 1.2    +2.7 +- 1.5 
 

This model installed on 4th April, this delay was due to bad weather followed by consecutive nights concentrating on HARP observations. Additionally the occasional RxA pointing suggested the previous model was continuing to perform extremely well.