… for astrometric binaries during the forthcoming ESA Gaia mission. Finally, orbital inclinations
… systems with reliable astrometric orbital elements involve main sequence stars for which the …

… Summary of the 1992–2021 astrometric data and best fitting orbits for the stars S2, S29, S38,
and S55. The black cross marks the position of the compact radio source Sgr A* and mass …

… observations of KIII stars between those of the O-type stars. These reference … the astrometric
orbital parameters presented in this study. Combined with the size of the apparent orbits and …

… The following parameters potentially control our ability to derive an astrometric orbit from the
… solutions derived in the present paper are too many to display the astrometric orbit for all …

… If we compare these classical definitions of orbital elements of a binary star with those
reported in our formulae, we see that we can easily transpose the appropriate definitions to …

… We implement seven stellar-orbit models to simulate both astrometric and spectroscopic
observations of S2 beginning near its next pericenter passage in 2018. Each model takes into …

… Using that the combined data set can be described very well by a Keplerian orbit (Figure
3). For the 211 degrees of freedom (96 astrometric epochs which count twice and 36 radial …

… ROA has developed its own software, which allows the accurate determination of the
astrometric position of stars, and efficiently differentiates the background stars from other positive …

… 99770 b’s orbital properties and mass, we simultaneously fit a model to its relative astrometry
(from the imaging data) and the host star’s proper motions and astrometric acceleration […

… distributions for the fitting orbital parameters. We test this method on Hipparcos stars with
known orbital solutions in the catalog and further apply it to 1561 stars with stochastic solutions, …