Table 1
Observation details.
| UT datea | Instrument | Mode | DIT/NDIT/NEXPb | Airmass | Seeingc (arcsec) | τ0 d (ms) | πe (deg) |
|---|---|---|---|---|---|---|---|
| 2019 May 09 | SPHERE | IRDIFS | 48/3/16 | 1.02-1.03 | 0.78 ± 0.09 | 2.7 ± 0.3 | 43.8 |
| 2019 Jul. 06 | SPHERE | IRDIFS | 48/3/16 | 1.02-1.03 | 0.66 ± 0.10 | 5.3 ± 0.6 | 43.3 |
| 2021 Jul. 16 | SPHERE | IRDIFS | 4/32/25 | 1.02-1.05 | 0.64 ± 0.11 | 3.3 ± 0.5 | 78.3 |
| 2022 May 04 | SPHERE | IRDIFS_EXT | 4/32/24 | 1.02-1.05 | 0.84 ± 0.18 | 4.5 ± 1.0 | 78.4 |
| 2022 Jul. 19 | GRAVITY | ON-AXIS | 100/4/8 | 1.03-1.13 | 1.26 ± 0.19 | 1.8 ± 0.2 | 46.0 |
| 2023 May 08 | GRAVITY | ON-AXIS | 100/4/7 | 1.03-1.13 | 0.95 ± 0.09 | 3.6 ± 0.5 | 35.2 |
| 2023 Jul. 01 | GRAVITY | ON-AXIS | 100/4/4 | 1.08-1.17 | 0.79 ± 0.12 | 6.4 ± 5.2 | 12.2 |
Notes. (a)UT date at the start of the observations. (b)Detector integration time, number of integrations per exposure, and number of exposures. The listed values of the SPHERE observations are taken from IRDIS. (c,d)Sample mean and standard deviation of the DIMM seeing and coherence time. (e) Rotation by the parallactic angle.
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