Notes. Both site and astCat are directly extracted from OCNS2019 (Yuan et al. 2021). The code site is the IAU observatory code. The astCat catalog is the star catalog or ephemerides used in astrometric reductions: the MPC code⁸ if a known star catalog is used, a question mark if an unknown star catalog is used, a plus sign if known ephemerides are used, and a slash if neither a star catalog nor ephemerides are used. The value N_g is the number of the observation nights, N the number of each type of observed coordinates, and RMS the root mean square of the post-fit residuals from our orbit fitting process. It should be emphasized that the observations listed in this table do not include those rejected by the 3σ criteria applied by the orbit fitting process and the post-fit residuals have been corrected with the observational model parameters determined by the orbit fitting process. The coordinate types include position angle, p, separation, s, the two components of absolute coordinates, right ascension α and declination δ, those of relative coordinates, Δα and Δδ, and those of differential coordinates, Δαcosδ and Δδ. All residuals in p are normalized by multiplying s and those in α and Δα by cos δ.