Period: 1st May - 19th May

This report covers those dates for which the model installed on 20th May was in use. This model was then superceded on 16th June.

Without any adjustment for nightly collimation differences, they behave as follows:

      Dataset       FE     No.    CA  ± dS       IE  ±  dZ
                                    (daz)          (del)
   090501-090519    A      98    +2.7 ±  2.9    -0.8 ± 2.9 

   090501-090519    H     200   +19.9 ±  1.8   +35.4 ± 3.7
 

These are displayed below; RxA on the left and HARP on the right:

RxA shows a relatively normal distribution. The higher than usual rms's may be due to the poor weather in which RxA data was taken during this period. HARP shows excellent azimuth pointing (dS=1.8") however elevation remains an issue. This is due the k-mirror terms which are as yet undetermined.

Period: 20th May - 15th June

Without any adjustment for nightly collimation differences, they behave as follows:

      Dataset       FE     No.    CA  ± dS       IE  ±  dZ
                                    (daz)          (del)
   090520-090615    A      84    -1.6 ±  2.3    -2.8 ± 2.8 

   090520-090615    H     339   +17.1 ±  2.9   +34.2 ± 3.8
 

These are displayed below; RxA on the left and HARP on the right:

This period was again dominated by HARP observing. The trend of dS-vs-Z seen in previous months has emerged once again, the reason for this strong systematic is unclear. The RxA performance is generally ok at high elevations, with the spread appearing at elevations <35° . Whilst this trend may be expected it is more pronounced than in previous months.