A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty

@article{Abuter2019AGD,
  title={A geometric distance measurement to the Galactic center black hole with 0.3\% uncertainty},
  author={Roberto Abuter and Ant{\'o}nio Amorim and M. Bauboeck and J. P. Berger and Henri Bonnet and Wolfgang Brandner and Yann Cl{\'e}net and Vincent Coud{\'e} du Foresto and P. T. de Zeeuw and Jason Dexter and G. Duvert and Andreas Eckart and Frank Eisenhauer and Natascha M. Forster Schreiber and P. Garcia and Feng Gao and Eric Gendron and Reinhard Genzel and Ortwin Gerhard and Stefan Gillessen and Maryam Habibi and X. Haubois and Th. Henning and Stephen Hippler and M. Horrobin and Alejandra Jim{\'e}nez-Rosales and L. Jocou and Pierre Kervella and Sylvestre Lacour and Vincent Lapeyr{\`e}re and J.-B. Le Bouquin and P. L{\'e}na and Thomas Ott and T. Paumard and K. Perraut and Guy Perrin and Oliver Pfuhl and Sebastian Rabien and G. Rodriguez Coira and G'erard Rousset and Silvia Scheithauer and Amiel Sternberg and Odele Straub and C. Straubmeier and Eckhard Sturm and Linda J. Tacconi and Frederic H. Vincent and S. D. von Fellenberg and Idel Waisberg and Felix Widmann and Ekkehard Wieprecht and Erich Wiezorrek and Julien Woillez and S. Yazici},
  journal={Astronomy \& Astrophysics},
  year={2019}
}
We present a 0.16% precise and 0.27% accurate determination of R0, the distance to the Galactic center. Our measurement uses the star S2 on its 16-year orbit around the massive black hole Sgr A* that we followed astrometrically and spectroscopically for 27 years. Since 2017, we added near-infrared interferometry with the VLTI beam combiner GRAVITY, yielding a direct measurement of the separation vector between S2 and Sgr A* with an accuracy as good as 20 μas in the best cases. S2 passed the… 

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