Table 2
SPHERE astrometry relative to the star of HR 2562 B.
| Epoch | Filter | ρ (mas) | PA (deg) | Δ RA (mas) | ΔDec (mas) | Pixel scale (mas/pix) | North correction angle (°) |
|---|---|---|---|---|---|---|---|
| IRDIS | |||||||
| 2016.95 | H | 637.8 ± 6.4 | 297.81 ± 0.54 | −564.1 ± 4.9 | 297.6 ± 4.1 | 12.251 ± 0.009 | −1.808 ± 0.043 |
| 2017.10 | H | 644.0 ± 2.3 | 297.82 ± 0.19 | −569.6 ± 1.8 | 300.5 ± 1.4 | 12.251 ± 0.009 | −1.712 ± 0.058 |
| 2017.75 | K1 | 661.2 ± 1.3 | 297.97 ± 0.16 | −583.9 ± 1.1 | 310.1 ± 0.8 | 12.267 ± 0.009 | −1.735 ± 0.043 |
| 2017.75 | K2 | 658.9 ± 1.6 | 298.08 ± 0.17 | −581.4 ± 1.2 | 310.2 ± 1.0 | 12.263 ± 0.009 | −1.735±0.043 |
| IFS | |||||||
| 2017.10 | Y J | 643.8 ± 3.2 | 297.51 ± 0.28 | −571.0 ± 2.7 | 297.4 ± 1.8 | 7.46 ± 0.02 | −102.19 ± 0.11 |
| 2017.75 | Y JH | 657.5 ± 2.6 | 297.65 ± 0.21 | −582.4 ± 2.1 | 305.1 ± 1.5 | 7.46 ± 0.02 | −102.22 ± 0.11 |
Notes. The astrometric error bars were derived assuming an error budget including the measurement and systematic errors. The uncertainties in the estimation of the location of the star were derived to be 2.7 and 0.94 mas for the December 2016 and February 2017 IRDIS data sets, respectively. For the February 2017 IFS data set, this uncertainty is estimated to be 0.11 mas. The September 2017 data sets were acquired simultaneously with the satellite spots in the field of view.
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