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Fig. 1

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Contours showing the astrometric predictions of each companion relative to the host star in ascension (Δα) and declination (Δδ) using the orvara orbit fitting package (Brandt et al. 2021c), with the measured companion positions shown by the overplotted gray stars. Relative astrometric positions indicate whether a companion can be directly detected with imaging given its projected separation between the host star and the companion itself. The 1, 2, and 3σ contour levels of the predicted positions of each companion are plotted from a full orbit fit using just the radial velocities and the HGCA astrometry, with the astrometric predictions being shown for the year in which each companion was then subsequently directly imaged with VLT/SPHERE in order to visually compare the prior predictions to the direct detections. The measured position of each companion from the VLT/SPHERE imaging are shown by the overplotted gray stars. In the case of HD 142234, the left star corresponds to HD 142234 B and the right star corresponds to HD 142234 C. The measured positions of each companion from direct imaging observations agree well with the predicted positions from the orbit fitting using just the radial velocities and astrometry from the HGCA.

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