Joint Astronomy Centre
Show document only
JAC Home
JCMT
UKIRT
Contact info
JAC Divisions
OMP
Outreach
Seminars
Staff-only Wiki
Weather
Web Cameras
____________________

JCMT home
Telescope
Pointing
20091012 report

CW/CCW inclinometry updated

12 October 2009


A full clockwise+counter-clockwise inclinometry run was carried out this weekend with the following results.

    Datasets    El   Dirn      HST       mean leg temperatures    Humidity
                              start      start   middle   end        %
   (20091003    89     cw     05:30       7.9     7.9     7.9      100
    20091003    89    ccw     08:15       7.9     8.2     8.4       95)
    20091011    89     cw     07:30       9.4     9.7    10.1       15
    20091011    89    ccw     10:15      10.1    11.0    11.8       19


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


  • The differences between the (CW) model derived from this run and the previous run on 3rd October are shown below.

    Click for larger image

  • The resulting rms scatters in the differences in (F1,F2,F3) are (0.44", 0.65", 0.36") compared to (0.37", 0.47", 0.22") previously.

  • The CW-CCW profile is normal, and is used to generate a hybrid track model which was installed on the 12th October at 10:00.

  • The relative loadings on the wheels continues to remain stable but now the absolute load on each individual wheel has decreased once again. Last week appears to be somewhat of an anomaly almost as though the ground had sunk, however it is likely due to temperature effects affecting the relative expansion of the respective loading points.

    For the most recent strain gauge plots click here.

Contact: Holly Thomas. Updated: Mon Oct 12 14:49:38 HST 2009

Return to top ^