Direct imaging and dynamical mass of a benchmark T-type brown dwarf companion to HD 167665

Open Access

Table 5

Relative astrometry of HD 167665B.

JD-2450000	Instrument	∆RA	∆Dec	Correlation factor
		(mas)	(mas)
9276.382	GRAVITY	171.424 ± 0.754	68.985 ± 0.695	−0.870
9354.302	SPHERE/IRDIS	167.4 ± 2.8	59.5 ± 2.6	n/a
9453.062	GRAVITY	163.210 ± 0.354	42.514± 0.439	0.259

Notes. The error bars on the SPHERE measurements were derived assuming an error budget including the measurement uncertainties (image post-processing) and calibration uncertainties (pixel scale, north correction angle; see text).

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