Astrometric and photometric characterization of η Tel B combining two decades of observations

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Volume 687 (July 2024)

A&A, 687 (2024) A301

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Table 4

Uncertainties used to calculate the error budget for the astrometry of the companion.

Epoch	σ_r	$σ_{R_{spec}}$ ${\sigma _{{{\rm{R}}_{{\rm{spec}}}}}}$	$σ_{R_{}}$ ${\sigma _{{{\rm{R}}_ }}}$	$σ_{R_{AF}}$ ${\sigma _{{{\rm{R}}_{{\rm{AF}}}}}}$	σ_PS	σ_θ	$σ_{Θ_{spec}}$ ${\sigma _{{{\rm{\Theta }}_{{\rm{spec}}}}}}$	$σ_{Θ_{}}$ ${\sigma _{{{\rm{\Theta }}_ }}}$	$σ_{Θ_{AF}}$ ${\sigma _{{{\rm{\Theta }}_{{\rm{AF}}}}}}$	σ_PO	σ_TN
	(pixels)	(pixels)	(pixels)	(%)	(mas pixel⁻¹)	(°)	(°)	(°)	(%)	(°)	(°)
2015-05-05	0.297	0.003	0.098	0.02	0.01	0.068	0.0005	0.016	0.02	0.11	0.145
2016-06-15	0.065	0.001	0.098	0.02	0.01	0.012	0.0001	0.016	0.02	0.11	0.060
2017-06-15	0.245	0.010	0.098	0.02	0.01	0.072	0.0015	0.016	0.02	0.11	0.040

Notes. The values correspond to errors associated with individual frames. The table only presents values related to the filters where the lowest uncertainties on each epoch were achieved: 2015-05-05 (H3); 2016-06-15 (BB_H), and 2017-06-15 (H2), thus referring to the filters also listed on Table 3.

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