Further Left- + Spare- Inclinometry

Further inclinometry have been acquired since the report of 981207 :

   Datasets          HST start      mean leg temperatures   Humidity
                                    start   middle   end       %
 ( inc981207           02:30         1.4     1.7     2.0      60 )
   inc981208           05:30         3.9     4.0     4.2      50
   inc981210           22:05         4.9     4.5     4.2      60
   inc981212           11:13         3.5     4.3     4.8      12
   inc981213           10:17         2.4     3.5     4.4      12

The SX channel in inc981208 showed zero throughout, and a couple of days were spent trying to restore telescope communications. Nonetheless, the differences LX-SX and LY-SY from all sets are similar to those seen previously .

Only fairly small changes were seen in the 10-08 and 13-12 data, and the largest changes, of size 3", are seen in the 12-10 data and are shown below :

Also of note in this plot, as pointed out by Richard in a meeting earlier in the week, is the difference in spike size between the 1st quadrant (azimuths 0 - 90) and the 5th (360 - 450). This is even more clearly illustrated in the data from 10-08 :

- which would seem to suggest that the track itself cannot be the cause of the spikes since the configuration in the 1st and 5th quadrants is surely the same ?! But this could also be said of the antenna - except (!) for the differences in turner position.

L-R symmetry
The data are used to update the symmetry measures using TY as a reference, as was started on 981115 :

Conclusions
The L-eft inclinometer continues to paint a more pessimistic picture of the correlation between left and right (or TMU) than does the spare, and, as previously, the worsening of the (a)symmetry on 981210 correlates with the re-appearance of the 'spikes'.