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Table 1.

Astrometric measurements and calibrations of all observation epochs.

Epoch Instrument Pixel scale (mas/pixel) True north (deg) Separation (arcsec) Position angle (deg)
1998.1339 WFPC2 45.52 ± 0.01 31.69 ± 0.005 1.314 ± 0.039 258.26 ± 1.21
2006.1311 NACO 13.24 ± 0.18 0.18 ± 1.24 1.299 ± 0.018 260.30 ± 1.24
2017.1311 SPHERE/IRDIS 12.263 ± 0.009 −1.71 ± 0.06 1.314 ± 0.002 261.41 ± 0.12
2017.4617 SPHERE/IRDIS 12.251 ± 0.009 −1.75 ± 0.11 1.319 ± 0.001 261.40 ± 0.23

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