Sagittarius A* cluster

The Sagittarius A* cluster is the cluster of stars in close orbit around Sagittarius A*, the supermassive black hole at the center of the Milky Way (in the Galactic Center).

As of 2020[update], S4714 is the current record holder of closest approach to Sagittarius A*, at about 12.6 astronomical units (1.88×109 km), almost as close as Saturn gets to the Sun, traveling at about 8% of the speed of light.

Its orbital period is 12 years, but an extreme eccentricity of 0.985 gives it the close approach and high velocity.

[2] The inferred orbits of stars around the supermassive black hole Sagittarius A* at the Milky Way's center are according to Gillessen et al. 2017,[3] with the exception of S2 which is from GRAVITY 2019,[4] S62 which is from Peißker et al. Jan 2020,[5] and S4711 up to S4715, which are also from Peißker et al., Aug 2020.

Tp is the epoch of pericenter passage, P is the orbital period in years and Kmag is the K-band apparent magnitude of the star.