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
20031019 report

CW Inclinometry OK


Inclinometry has been done as follows :

    Datasets  El Dirn     HST     mean leg temperatures   Humidity
                          start     start   middle   end       %
  ( 20031004  90  cw      10:30      5.0      6.1    7.0      25 
    20031012  90  cw      23:53      3.5      3.5    3.4     100 )
    20031019  90  cw      21:32      8.5      8.3    8.0      30

All channels of the new data were OK. The resulting model is compared with previous one taken on 12 Oct below :

  • The change in the behaviour of the F1 term evident last time has been reversed, again possibly as a result of the higher temperatures. The differences in (F1,F2,F3) between these two CW models are described by the rms scatters of (0.46", 0.27", 0.36") c.f. (0.24", 0.13", 0.37") previously.

  • The new data have not been used to create a new track model : The prevailing temperature is rather high for normal winter nighttimes and the previous model is likely to be more appropriate.

  • The data have nonetheless been used to update the plots of symmetry and strain gauge data. All seems OK.


Iain Coulson
Latest Update : 20 Oct 2003
Contact: Iain Coulson. Updated: Sat Nov 6 18:00:26 HST 2004

Return to top ^