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Table 1
Observing log (2013 May 18).
| Instrument | Elapsed time | Exp. timea | Airmass | Δλ | λ | p ∗ | Θ |
| (UT) | (s) | (μm) | (μm) | (%) | (deg) | ||
|
|
|||||||
| ALFOSC | 21:20–00:32 | 15 × 4 × 90 | 1.19–2.58 | 0.4–0.9 | 0.428 | 10.5 ± 0.3 | 112.2 ± 0.8 |
| 0.535 | 7.7 ± 0.2 | 112.3 ± 0.7 | |||||
| 0.631 | 6.4 ± 0.2 | 113.0 ± 1.1 | |||||
| 0.810 | 5.7 ± 0.6 | 114.8 ± 4.9 | |||||
| LIRIS | 21:32–23:05 | 6 × 2 × 400 | 1.22–1.57 | 0.9–1.5 | 1.035 | 4.0 ± 0.7 | 111.8 ± 4.9 |
| 1.250 | 4.2 ± 0.6 | 119.2 ± 4.2 | |||||
| LIRIS | 23:08–00:01 | 4 × 2 × 400 | 1.67–2.18 | 1.4–2.4 | 1.640 | 4.6 ± 0.8 | 109.8 ± 5.2 |
| 2.150 | 4.0 ± 1.2 | 106.3 ± 8.6 | |||||
Notes.
(a)
Number of polarimetric cycles as defined in Sect. 2, × number of frames in one cycle, × integration time per frame.
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