Pointing was obtained w/RxA during the night of UT 01 Sep. 35 data were logged; a few at the start were all on crl2688 during other tests, although they cover a non-trivial range of (az,el) space and so have been left in the reduction for now. The data were first reduced/displayed using TPOINT to remove just the collimation offsets. The raw data show raw rms residuals in (dS,dZ) of (2.3",2.3"): a hugely satisfying confirmation of the model installed yesterday. Nonetheless, some residual systematic trends remain:

particularly of dZ -vs- Z (zenith distance). A new pointing model was therefore derived using TPOINT allowing all 7 parameters of the model to be optimized. The results :

show the general removal of the systematics and an improvement in the scatter to (2.1", 1.7") rms in (dS,dZ):

          *HA           *Dec      *Az   *ZD     dX     dD     dS     dZ     dR  Obs.no. source

   1  -02 53 57.52  +36 43 10.5   56.5  41.4    1.0    4.9    5.0   -0.0    5.0    24  crl2688
   2  -02 05 52.52  +36 43 08.2   51.7  32.2    1.2    1.5    1.8   -0.6    1.9    33  ..
   3  -01 57 19.20  +36 43 07.9   50.3  30.7    0.7    0.5    0.7   -0.4    0.8    35  ..
   4  -01 48 07.64  +36 43 07.6   48.7  29.0   -0.0    0.2    0.1    0.1    0.2    37  ..
   5  -01 33 08.86  +36 43 07.2   45.4  26.4   -0.5    0.4    0.1    0.6    0.6    39  ..
   6  -01 23 32.28  +36 43 07.0   42.8  24.9   -0.3   -0.1   -0.3    0.2    0.3    41  ..
   7  -01 14 09.63  +36 43 06.8   39.9  23.4   -0.5    0.8    0.3    0.9    1.0    43  ..
   8  -00 03 50.76  +36 43 06.2    2.7  16.9   -0.6    0.1   -0.6    0.1    0.6    55  crl2688
   9  -01 49 16.66  -07 27 29.1  132.8  38.3    1.7   -0.9   -1.9   -0.5    2.0    56  Uranus
  10  -01 03 20.72  -07 27 32.2  148.7  31.4    1.0   -1.5   -1.6    0.9    1.8    66  ..
  11  -00 11 14.08  -07 27 34.7  173.9  27.4    1.4   -1.7   -1.6    1.5    2.2    79  ..
  12  +00 24 49.24  -07 27 36.0  193.2  28.0    3.5    1.2   -3.7   -0.4    3.7    87  Uranus
  13  +02 31 15.34  +36 43 09.6  305.3  37.0   -1.7    2.6   -3.0   -0.9    3.1    89  crl2688
  14  +01 51 48.94  +42 18 26.3  319.9  32.6   -1.6   -2.0    0.7   -2.5    2.6    92  BLLac
  15  +04 01 04.85  +33 33 57.9  297.7  54.8   -2.5    0.0    0.0   -2.5    2.5    94  K3-50
  16  +02 39 07.27  +66 08 16.6  341.1  52.9   -1.7   -1.3   -0.2   -2.1    2.1    97  LkHa234
  17  -02 46 46.58  +41 31 58.8   48.9  41.3   -2.1   -1.1   -1.7    1.7    2.4    99  3c84
  18  -04 04 55.83  +36 07 42.1   59.2  55.6    0.3    1.2    1.2   -0.3    1.3   100  crl618
  19  -01 42 53.15  +61 53 33.2   16.6  45.7   -1.8    1.9   -0.4    2.6    2.7   102  w3(oh)
  20  -02 29 47.83  +58 47 53.6   25.3  47.4   -2.3    2.8    0.7    3.6    3.7   105  GL490
  21  +00 50 44.86  +38 36 42.7  332.4  21.8    1.4   -4.1    3.4   -2.6    4.3   107  RAnd
  22  +04 42 03.39  +42 39 07.8  308.6  62.6   -0.9    0.5   -0.5   -0.9    1.1   109  w75n
  23  +04 22 31.84  +36 43 20.5  301.7  59.1    0.8    1.7   -1.8    0.7    1.9   110  crl2688
  24  +03 13 48.11  +11 46 10.7  267.8  47.2   -2.0    3.1   -2.4   -2.8    3.7   114  2230+114
  25  +03 09 08.02  +16 11 14.2  273.3  45.0   -0.4   -2.4    2.4    0.1    2.4   116  2251+158
  26  +03 15 53.54  -07 27 34.7  245.4  55.4    1.1   -2.8    1.9    2.4    3.0   119  Uranus
  27  -02 12 15.80  +36 07 33.2   53.6  33.2   -1.9    0.9    0.2    2.1    2.1   123  crl618
  28  -01 48 39.17  +18 09 08.1   89.2  25.7   -2.4   -0.1    0.3    2.4    2.4   125  L1551-irs5
  29  -02 41 21.65  -05 21 37.4  118.2  47.0    0.6   -0.8   -1.0   -0.1    1.0   128  omc1
  30  -02 45 08.75  +00 22 28.9  110.7  44.8   -2.7    1.2    2.3    1.8    3.0   130  n2071ir
  31  +00 52 01.66  -02 56 20.9  210.7  26.1   -1.5   -1.7    2.1    0.8    2.3   132  oCeti
  32  -00 29 23.56  +11 25 50.2  138.8  11.0   -1.3    0.9    1.6    0.2    1.6   134  NMLTau
  33  -00 58 52.12  +18 09 07.1   94.4  14.0    1.4   -4.3   -4.5   -0.7    4.5   136  L1551-irs5
  34  -01 53 51.82  -05 21 40.0  129.0  37.7    5.6    1.1   -3.0   -4.9    5.8   138  omc1
  35  -00 52 15.42  +36 07 31.2   32.4  19.9    2.6    1.6    3.0   -0.4    3.1   140  crl618
                                                dX     dD     dS     dZ     dR
                                        RMS     1.86   1.96   2.06   1.74   2.70

The new model was installed at 13:45 HST 01 Sep 2006.