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20080528 report

RxA pointing model update


Following the mounting of SCUBA2 and the repeated inclinometry we have acquired 15 RxA pointing data in grade 2 weather.

         UT       FE       No.     CA  +- dS       IE  +-  dZ
                                      (daz)           (del)
       20080528   RxA       15     +7.4 +- 2.4     -4.0 +- 1.9

A full 7-parameter fit can reduce the rms's (dS,dZ) to (1.8",1.7") but the last datum (taken at low elevation and at ~06:30 HST, when the Sun was well up) is the most discrepant, and without it

         UT       FE       No.     CA  +- dS       IE  +-  dZ
                                      (daz)           (del)
       20080528   RxA       14     +7.8 +- 1.7     -4.2 +- 1.8

This (RxA) model update was made at 07:00 HST on 28 May 2008, and a subsequent pointing showed it to have 'taken' well. The RxW(B) collimations -- most recently adjusted while RxA collimations were not (0,0) -- were adjusted to

   uaz  (X)  =  +9.4
   uel  (Y)  = -24.7

Unfortunately attempts to check this adjustment this night failed with data reduction errors. Other FEs, like HARP, needed no such collimation adjustment.

Contact: Holly Thomas. Updated: Wed May 28 07:45:31 HST 2008

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