Open Access

Table 2

Log of observations.

UT date 28-09-2017
Observing mode IRDIS_EXT
IRDIS filter K1K2
IFS band YH
IRDIS DIT 24s
IRDIS NDIT 32
IFS DIT 32s
IFS NDIT 7 × 22
Field rotation 44.1 deg
Strehl ratio 0.85−0.91
Airmass (start/end) 1.10−1.09
Seeing 0.4−0.7"
Coherence time (τ0) 5−12 ms

Notes. DIT stands for detector integration time. The Strehl ratio is measured at 1.6 μm. The seeing and coherence time are measured at 0.5 μm.

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