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Table 2.

HD 167971 astrometry.

VLBI coordinates of the emission’s peak
Epoch RA σRA Dec σDec
2006.59 274.5245618° 0.4 mas −12.2425887° 0.2 mas
2016.61 274.5245618° 1.9 mas −12.2425957° 0.9 mas

SB relative position from the VLBI coordinates(a)
Epoch ΔRA σΔRA ΔDec σΔDec

2006.59 −0.4 mas 0.4 mas 7.0 mas 0.3 mas
2016.61 −10.0 mas 2.0 mas −3.8 mas 1.0 mas

Gaia coordinates(b)
Epoch RA σRA Dec σDec

2016.61 274.5245619° 0.2 mas −12.2425958° 0.2 mas



The reported error bars include the uncertainty reported for the position of the binary system with respect to the radio emission derived from our model, and the intrinsic astrometric error of the radio maps.


The reported error bars include the Gaia uncertainty of the 2015.5 position and the uncertainties in the proper motions.

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