Astrometric orbit by Mason et al. (2010) of HD 155826. The published orbit (see Table 2) is shown as a red solid line, the dash dotted line is the line of nodes. The black points are individual measurements retrieved from the Washington Double Star Catalog. The green point is the new astrometric point based on FSU-A visibility measurements. The solid lines connecting the individual measurements with the orbit indicate the expected position for the given orbital solution.