The Great Escape: Discovery of a nearby 1700 km/s star ejected from the Milky Way by Sgr A*

Sergey E. Koposov, Douglas Boubert, Ting S. Li +17

We present the serendipitous discovery of the fastest Main Sequence hyper-velocity star (HVS) by the Southern Stellar Stream Spectroscopic Survey (S5). The star S5-HVS1 is a $\sim…