Notes. The solutions are listed in three blocks (I to III) as discussed in the text. The first column identifies the orbits with letters to facilitate the discussion in the text. Columns 2–8 list the orbit’s Keplerian elements (semi-major axis, a, eccentricity, e, mutual orbital period, T, time of perihelion relative to UT 2016 August 22, t_per, and the angle between the line of sight on UT 2016 August 22 and the line of apsides, α₀), the sense of rotation and the system mass given by Kepler’s third law M_S = (4π²a³)∕(GT²). The following 24 columns show whether an orbit solution reproduces the measured distance within its error bars during the concerned epoch regardless of its sign (green if true). Marked in yellow is the solution (II.c) that we adopt as the best fit to our data (Fig. 5), because it best reproduces the pre-perihelion data and indeed all datasets from 2011 to mid-2018. It is also the only solution with a mass-compatible equivalent matching all data from the inactive phase (block III and refined parameter grid in Fig. 4).