Detection of faint stars near Sagittarius A* with GRAVITY

@article{Abuter2021DetectionOF,
  title={Detection of faint stars near Sagittarius A* with GRAVITY},
  author={Roberto Abuter and Ant{\'o}nio Amorim and Michi Baub{\"o}ck and J. P. Berger and Henri Bonnet and Wolfgang Brandner and Yann Cl'enet and Yigit Dallilar and Richard I. Davies and P. Tim de Zeeuw and Jason Dexter and Anderson Drescher and Frank Eisenhauer and Natascha M. F{\"o}rster Schreiber and P. Garcia and Feng Gao and Eric Gendron and Reinhard Genzel and Stefan Gillessen and Maryam Habibi and X. Haubois and Gernot Hei{\ss}el and Th. Henning and Stephen Hippler and M. Horrobin and Alejandra Jim{\'e}nez-Rosales and L. Jochum and L. Jocou and A. Kaufer and Pierre Kervella and Sylvestre Lacour and Vincent Lapeyr{\`e}re and Jean-Baptiste Le Bouquin and Pierre L'ena and Dieter Lutz and M. Nowak and Thomas Ott and T. Paumard and K. Perraut and Guy Perrin and Oliver Pfuhl and Sebastian Rabien and Gustavo Rodr'iguez-Coira and Jinyi Shangguan and T. Taro Shimizu and Silvia Scheithauer and J. Stadler and Odele Straub and C. Straubmeier and Eckhard Sturm and Linda J. Tacconi and Frederic H. Vincent and Sebastiano D. von Fellenberg and Idel Waisberg and Felix Widmann and Ekkehard Wieprecht and Erich Wiezorrek and Julien Woillez and S. Yazici and G{\'e}rard Zins},
  journal={Astronomy \& Astrophysics},
  year={2021}
}
The spin of the supermassive black hole that resides at the Galactic Center can, in principle, be measured by accurate measurements of the orbits of stars that are much closer to Sgr A* than S2, the orbit of which recently provided the measurement of the gravitational redshift and the Schwarzschild precession. The GRAVITY near-infrared interferometric instrument combining the four 8m telescopes of the VLT provides a spatial resolution of 2–4 mas, breaking the confusion barrier for adaptive… 
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