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Table 1
Observing log.
| UT Date | Instrument | Filter | NDITa × DITb | NDITa × DITb (Fluxc) | Δπd | True North | Pixel scale |
|---|---|---|---|---|---|---|---|
| (s) | (s) | (°) | (°) | (mas pixel−1) | |||
| 2017-05-18 | NACO | L′ | 30 114 × 0.2 | 2400 × 0.1 | 113 | − 0.44 ± 0.10 | 27.20 ± 0.05 |
| 2017-05-19 | NACO | M′ | 71 200 × 0.05 | 2400 × 0.04 | 96 | − 0.44 ± 0.10 | 27.20 ± 0.05 |
| 2017-05-03 | SPHERE-IFS | Y –H + SAM | 384 × 4 | 49.5 | 1.78 ± 0.05 | 7.46 ± 0.02 | |
| 2017-05-03 | SPHERE-IRDIS | K1 + SAM | 720 × 2 | 49.5 | 1.78 ± 0.05 | 12.267 ± 0.01 | |
| 2017-05-03 | SPHERE-IRDIS | K2 + SAM | 720 × 2 | 49.5 | 1.78 ± 0.05 | 12.263 ± 0.01 | |
| 2018-05-12 | SPHERE-IFS | Y –H | 40 × 96 | 47 × 2 | 31.7 | 1.76 ± 0.06 | 7.46 ± 0.02 |
| 2018-05-12 | SPHERE-IRDIS | K1 | 40 × 96 | 101 × 0.84 | 31.7 | 1.76 ± 0.06 | 12.267 ± 0.01 |
| 2018-05-12 | SPHERE-IRDIS | K2 | 40 × 96 | 101 × 0.84 | 31.7 | 1.76 ± 0.06 | 12.263 ± 0.01 |
Notes. (a) NDIT refers to the total number of integrations. (b)DIT refers to the integration time of each image. (c)Flux refers to thesequence of images taken to measure the number of detector counts and PSF shape of the primary star. (d) Δ π is the maximum change in parallactic angle during the sequence.
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