Table 2.
Determined diattenuations with their errors and computed retardances of the part of the model describing the telescope and M4 in the Y-, J-, H-, and Ks-band.
| Parameter | Valid before or after | BB_Y | BB_J | BB_H | BB_Ks |
|---|---|---|---|---|---|
| April 16, 2017 | |||||
| ϵUT | Before | 0.0236 ± 0.0002 | 0.0167 ± 0.0001 | 0.01293 ± 8 × 10−5 | 0.0106 ± 0.0003 |
| After | 0.0175 ± 0.0003 | 0.0121 ± 0.0002 | 0.0090 ± 0.0001 | 0.0075 ± 0.0005 | |
| ϵM4 | Before | 0.0182 ± 0.0002 | 0.0128 ± 0.0001 | 0.00985 ± 8 × 10−5 | 0.0078 ± 0.0003 |
| After | 0.0182 ± 0.0003 | 0.0130 ± 0.0002 | 0.0092 ± 0.0001 | 0.0081 ± 0.0005 | |
| 𝛥UT = (°) | Before and after | 171.9 | 173.4 | 175.0 | 176.3 |
| 𝛥M4 (°) | Before and after | 171.9 | 173.4 | 175.0 | 176.3 |
Notes. The second column shows when the parameters are valid, i.e., before and/or after the re-aluminization of M1 and M3 that took place between April 3 and April 16, 2017. The diattenuations of the UT and M4 that are valid before April 16, 2017 are determined from the observations of HD 176425 in 2016, and those valid after April 16, 2017 are determined from the observations of HD 217343 in 2018.
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