Poor weather allowed us to gather a regular CW run on 08 Feb :

    Datasets El Dirn     HST     mean leg temperatures   Humidity
                        start      start   middle   end       %
  ( 20020125 90 cw       06:05     -0.8     -0.5   -0.3      65 )
    20020208 90 cw       22:55     -3.5     -3.5   -3.4      90

• The new data at are again of full amplitude - i.e. showing no sign of the 'small-amplitude' syndrome captured on 17 Oct.

• The difference between the model resulting from the new data and those from 25 Jan is shown below :
  

• The formal differences in (F1,F2,F3) between these data are described by the rms scatters of (1.08", 0.48", 0.63") c.f. (0.50", 0.51", 0.65") previously. The larger-than-normal difference (in F1) is probably due to the fairly cold temperatures prevailing.

• The new model was installed at 11:50 HST 11 Feb 2002.

• The data were also analysed for symmetry properties -- the time line shows all is OK.

• . . . and the Strain Gauge measures are added to the record - all seems OK, although, as with symmetry, the impact of the very low temperatures may be detected in these new data.

All-sky Pointing UT 20020210
44 points SCUBA pointing results were logged, a majority in the period 02:00-05:00 HST. They are shown below :

Residuals had rms's of (2.7",2.6") but there were 5 odd data which I felt justified in removing, to give a rather nice (1.6", 1.9") from the remaining 39 data. These 5 were

• g343.0 at el=11degs : possibly useful for determining TF or tweaking the refraction algorithm, but only in conjunction with other low-el data (next lowest was ~25degs).
• 1656+477 at el=30 : v.weak to the point of vanishing : the array noise seemed stronger, and I worry about centroid determinations under such circumstances.
• 3 data taken above el=77 (0529+075, 0529+075, 1116+128, all in the south). These sit ~8" from the mean of the others in azimuth, in the sense that the telescope was shooting behind the source. I am worried that this is tracking problem, but this would need confirmation by similar observations of northern sources.