990304 report
Pointing: update central bearing solution (19990405)
April 05, 1999
A NEW 'EMPIRICAL' SOLUTION WAS INSTALLED AT THE TELESCOPE ON 05-APR-1999 AT
11:22:39.70
Central bearing measurement - 25% lower amplitude
The lastest measurements (990403 and 990404) confirm the decrease in
amplitude seen earlier. Since the residuals had increased to ~2.5" at
the horizon, a new solution was installed which is the previous one
scaled by 75%. While this solution is not optimal in terms of shape,
it roughly halfs the residuals.
The residuals and old and new solution are shown below.
The plot shows pointing data of 990403 without the
empirical correction in green,
with at the bottom the residuals (black
line) resulting from the empirical solution (black line, top) in use at the time of the
measurement. The red lines show the
new model and the new residuals: the horizon errors over the range of
the CB feature are within ~1.25"".
Please address any comments,
suggestions or requests to:
Iain Coulson
05 Apr 1999
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