Table 3.
Observation conditions for each sequence of selected data.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|
| Sequence | Asterism | Beginning | Distance | Zenith | LGS elongation | LGS | LGS Flux | r0 (cm) | |
| number | name | of sequence | LLT-WHT | angle | above 20% (arcsec) | FWHM | (103e−) | ||
| (UTC) | (m) | (deg) | observed | for 39 m | (arcsec) | ||||
| 1 | A349 | 28/09 05h51m | 36.1 | 6 | 15.9 | 16.9 | 2.0 | 1.2 | 11.3 |
| 2 | A34 | 28/09 21h22m | 37.8 | 33 | 16.9 | 20.8 | 2.0 | 1.5 | 10.6 |
| 3 | A34 | 28/09 21h49m | 38.8 | 39 | 16.4 | 22.4 | 2.0 | 1.3 | 10.8 |
| 4 | A53 | 28/09 22h51m | 31.8 | 18 | 15.1 | 19.7 | 1.9 | 1.5 | 11.7 |
| 5 | A53 | 28/09 23h13m | 33.3 | 15 | 14.5 | 18.2 | 1.9 | 1.5 | 12.0 |
| 6 | A53 | 29/09 02h37m | 39.0 | 35 | 12.3 | 14.7 | 2.0 | 1.2 | 13.4 |
| 7 | A53 | 29/09 03h02m | 39.0 | 40 | 12.2 | 16.0 | 2.2 | 1.1 | 12.5 |
| 8 | A53 | 29/09 03h26m | 38.8 | 45 | 11.2 | 16.1 | 2.1 | 0.9 | 14.7 |
| 9 | A349 | 29/09 04h43m | 32.1 | 20 | 13.1 | 16.9 | 2.0 | 1.7 | 12.4 |
| 10 | A349 | 29/09 05h05m | 33.7 | 15 | 14.0 | 16.7 | 2.1 | 1.7 | 10.5 |
| 11 | A349 | 29/09 05h27m | 35.2 | 10 | 15.8 | 17.6 | 2.1 | 1.9 | 10.8 |
| 12 | A349 | 29/09 05h50m | 36.2 | 6 | 16.5 | 18.1 | 2.1 | 2.0 | 10.0 |
| 13 | G413 | 02/10 01h24m | 33.3 | 20 | 13.8 | 16.8 | 2.1 | 1.0 | 10.8 |
| 14 | G413 | 02/10 01h44m | 34.4 | 19 | 14.3 | 17.3 | 1.9 | 1.2 | 14.8 |
| 15 | G413 | 02/10 02h07m | 35.5 | 19 | 14.2 | 16.3 | 1.7 | 1.2 | 22.1 |
Notes. Sequences not separated by a solid line follow each other in time and target the same asterism. Column 1: sequence number. Column 2: asterism name. Column 3: date and time of the beginning of the sequence. Column 4: mean distance between the LLT and the centre of the WHT pupil, projected perpendicular to the WHT pointing direction. Column 5: zenith angle in degrees. Columns 6 and 7: spot elongation above 20% of the maximum spot intensity for the observed spot (6) and computed for a 39 m distance to the LLT and an observation at zenith (7). Column 8: FWHM along the LGS spot minor axis. Column 9: flux recorded on the LS camera per subaperture per frame. Column 10: r0 derived from the TS measurements by fitting the temporal variance of the Zernike coefficients (obtained with open-loop reconstruction of the slopes) with the distribution given by Noll (1976) and computed for a wavelength of 500 nm. Columns 6–10 give values averaged over the subapertures and acquisitions. The three highlighted rows correspond to data analysed in greater detail in the rest of the paper.
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