Table 1.
Log of the SPHERE observations (IRDIS and ZIMPOL).
| Filter | Date | Obs time | Sky time | λ0 | Δλ | Seeing |
|---|---|---|---|---|---|---|
| (UT) | (min) | (min) | (μm) | (μm) | (″) | |
| (1) | (2) | (3) | (4) | (5) | (6) | (7) |
| H | 10–11/12/2014 | 17.07 | 6.40 | 1.625 | 0.290 | 0.91 to 1.22 |
| Ks | 10–11/12/2014 | 11.33 | 2.00 | 2.182 | 0.300 | 0.73 to 0.78 |
| Cnt H | 12–14/09/2016 | 85.33 | 32.00 | 1.573 | 0.023 | 0.87 to 1.07 |
| Cnt K1 | 12–14/09/2016 | 85.33 | 42.67 | 2.091 | 0.034 | 0.82 to 1.13 |
| Cnt K2 | 12–14/09/2016 | 106.67 | 42.27 | 2.266 | 0.032 | 0.75 to 0.98 |
| NR | 12/10/2016 | 12.25 | – | 0.6459 | 0.0567 | ≈0.89 |
Notes. (1) Filter name according to the SPHERE user manual. (2) Date of the observation (UT). (3) Observation integration duration, combining all the HWP and dithering positions. (4) Sky observation integration time, taken with one preferential HWP position (see text). (5) Filter central wavelength (in μm). (6) Filter full width at half maximum (in μm). (7) Seeing (in arcseconds) as measured by the observatory, corrected for airmass. This is different from the achieved angular resolution, which is around 60 mas in the NIR and 100−150 mas in the red, as described in text.
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