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Pointing
20030730 report b

Pointing following SMU repair OK


Repeated X-table errors forced the removal & repair of the SMU on 14/15/16 July, although subsequent problems with the membrane delayed the return to observing until Jul 27.

The evening shift of 30 July was used in part to obtained allsky pointing data with SCUBA. 53 data were logged, and gave raw rms residuals in (daz,del) of (1.7",1.9"). There were strong thermal effects at the start of the night, most simply expressed as a linear relationship between the elevation residuals and mean antenna temperature. Accounting for this trend reduces the rms residuals in elevation to 1.4". There were no other strong geometric trends. Given this essentially nominal performance I shall not adjust the pointing model.

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

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