IRC+10216 was again tracked using RxA and the technique of repeated FIVEPOINTs between 06:34 HST and 09:30. It traversed the sky from (az,el) = (110,73) through transit at 07:40 HST at an elevation of 83.5^o, ending at (az,el) = (261,63). Plots of the residuals against azimuth are shown below :

The raw performance statistics are poor; rms's in (daz,del) of (1.5", 1.9"), due perhaps to the poor weather (grade 4 tau) which manifests most clearly at the end. However, the pattern of residuals is fairly similar to that seen in the previous experiment with RxA.

I continue to assimilate the meaning of recent tracking work.