Table 1
Log of SPHERE observations.
| Date UT | Filter | Field rotation | Pol. cycle | DIT | Nexp | Texp | Seeing | τ0 | TN |
|---|---|---|---|---|---|---|---|---|---|
| (°) | (s) | (s) | (″) | (ms) | (°) | ||||
| 2015-05-16 | IRDIS-H23 | 42.70 | – | 64 | 64 | 4096 | 0.83 ± 0.07 | 3.6 ± 0.3 | –1.712 |
| 2015-05-16 | IFS-YJ | 42.70 | – | 64 | 64 | 4096 | 0.83 ± 0.07 | 3.6 ± 0.3 | –1.712 |
| 2016-03-30 | IRDIS-K12 | 42.57 | – | 64 | 64 | 4096 | 0.86 ± 0.16 | 3.1 ± 0.6 | –1.756 |
| 2016-03-30 | IFS-YH | 42.57 | – | 64 | 64 | 4096 | 0.86 ± 0.16 | 3.1 ± 0.6 | –1.756 |
| 2017-03-21 | IRDIS - H | stabilized | 10 | 64 | 80 | 5120 | 0.75 ± 0.12 | 3.4 ± 0.7 | –1.700 |
| 2017-06-15 | IRDIS-K12 | 59.35 | – | 96 | 64 | 6144 | 0.52 ± 0.10 | 6.1 ± 2.0 | –1.739 |
| 2017-06-15 | IFS-YH | 59.35 | – | 96 | 64 | 6144 | 0.52 ± 0.10 | 6.1 ± 2.0 | –1.739 |
Notes. The columns from left to right indicate the date of observations in UT, the filter, the field rotation, the number of polarimetric cycles, the individual exposure time (DIT) in seconds, the total number of exposures, the total exposure time in seconds, the DIMM seeing measured in arcseconds, the correlation time τ0 in milliseconds, the variation of the flux during the sequence in %, and the true north (TN) offset in degrees.
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