July 8, 2022

16 stars of the S cluster

An article published in “The Astrophysical Journal” reports the identification of the star with the closest orbit around Sagittarius A*, the supermassive black hole at the center of the Milky Way. A team of researchers cataloged it as S4716 after finding it in data collected over twenty years with the Keck Observatory, the VLT, and the VLTI. The star S4716 completes an orbit in about 4 Earth years and its distance from Sagittarius A* is as close as 100 times the Earth’s from the Sun. Its discovery, which breaks the record of the star S4711, is surprising and will help to better understand how stars in that area formed and moved, as it’s difficult to think that it formed this close to a supermassive black hole.