Table 1
Log of the NACO observations of L2 Pup and its associated PSF calibrators, β Col and α Lyn.
| MJD | Star | Filter | DIT [ms] | AM |
| [μm] | × NDIT | |||
|
|
||||
| 56 364.1751 | α Lyn | 3.74 | 8.4 × 3900 | 2.189 |
| 56 364.1757 | α Lyn | 4.05 | 8.4 × 3900 | 2.194 |
| 56 372.0463 | β Col | 1.75 | 7.2 × 4200 | 1.202 |
| 56 372.0468 | β Col | 1.64 | 7.2 × 4200 | 1.204 |
| 56 372.0476 | β Col | 1.28 | 7.2 × 4200 | 1.207 |
| 56 372.0482 | β Col | 1.26 | 7.2 × 4200 | 1.210 |
| 56 372.0489 | β Col | 1.24 | 7.2 × 4200 | 1.212 |
| 56 372.0495 | β Col | 1.09 | 7.2 × 4200 | 1.215 |
| 56 372.0501 | β Col | 1.08 | 7.2 × 4200 | 1.218 |
| 56 372.0508 | β Col | 1.04 | 7.2 × 4200 | 1.220 |
| 56 372.0515 | β Col | 2.12 | 7.2 × 4200 | 1.224 |
| 56 372.0521 | β Col | 2.17 | 7.2 × 4200 | 1.226 |
| 56 372.0534∗ | β Col | 3.74 | 8.4 × 3900 | 1.232 |
| 56 372.0540∗ | β Col | 4.05 | 8.4 × 3900 | 1.235 |
|
|
||||
| 56 372.0609 | L2 Pup | 1.75 | 7.2 × 4200 | 1.119 |
| 56 372.0613 | L2 Pup | 1.75 | 7.2 × 4200 | 1.120 |
| 56 372.0626 | L2 Pup | 1.64 | 7.2 × 4200 | 1.122 |
| 56 372.0630 | L2 Pup | 1.64 | 7.2 × 4200 | 1.123 |
| 56 372.0637 | L2 Pup | 1.28 | 7.2 × 4200 | 1.124 |
| 56 372.0641 | L2 Pup | 1.28 | 7.2 × 4200 | 1.125 |
| 56 372.0648 | L2 Pup | 1.26 | 7.2 × 4200 | 1.127 |
| 56 372.0652 | L2 Pup | 1.26 | 7.2 × 4200 | 1.128 |
| 56 372.0659 | L2 Pup | 1.24 | 7.2 × 4200 | 1.129 |
| 56 372.0663 | L2 Pup | 1.24 | 7.2 × 4200 | 1.130 |
| 56 372.0670 | L2 Pup | 1.09 | 7.2 × 4200 | 1.131 |
| 56 372.0674 | L2 Pup | 1.09 | 7.2 × 4200 | 1.132 |
| 56 372.0678 | L2 Pup | 1.09 | 7.2 × 4200 | 1.133 |
| 56 372.0685 | L2 Pup | 1.08 | 7.2 × 4200 | 1.134 |
| 56 372.0689 | L2 Pup | 1.08 | 7.2 × 4200 | 1.135 |
| 56 372.0693 | L2 Pup | 1.08 | 7.2 × 4200 | 1.136 |
| 56 372.0700 | L2 Pup | 1.04 | 7.2 × 4200 | 1.138 |
| 56 372.0704 | L2 Pup | 1.04 | 7.2 × 4200 | 1.139 |
| 56 372.0708 | L2 Pup | 1.04 | 7.2 × 4200 | 1.140 |
| 56 372.0716 | L2 Pup | 2.12 | 7.2 × 4200 | 1.141 |
| 56 372.0720 | L2 Pup | 2.12 | 7.2 × 4200 | 1.142 |
| 56 372.0727 | L2 Pup | 2.17 | 7.2 × 4200 | 1.144 |
| 56 372.0731 | L2 Pup | 2.17 | 7.2 × 4200 | 1.145 |
| 56 372.0770 | L2 Pup | 3.74 | 8.4 × 3900 | 1.154 |
| 56 372.0775 | L2 Pup | 3.74 | 8.4 × 3900 | 1.155 |
| 56 372.0781 | L2 Pup | 4.05 | 8.4 × 3900 | 1.157 |
| 56 372.0786 | L2 Pup | 4.05 | 8.4 × 3900 | 1.158 |
Notes. MJD is the average modified Julian date of the exposures. DIT is the individual exposure time of the NACO frames, and NDIT is the total number of frames recorded. AM is the airmass. ∗ The observations of β Col in the L band (3.74 and 4.05 μm) were affected by a centering problem and were therefore replaced by another PSF standard (α Lyn).
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