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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).
There are a number of stars in close orbit around Sagittarius A*, which are collectively known as "S stars". [73] These stars are observed primarily in K band infrared wavelengths, as interstellar dust drastically limits visibility in visible wavelengths.
10 Δεκ 2008 · One of the stars has now completed a full orbit around the black hole. By watching the motions of 28 stars orbiting the Milky Way's most central region with admirable patience and amazing precision, astronomers have been able to study the supermassive black hole lurking there. It is known as "Sagittarius A*" (pronounced "Sagittarius A star").
“Following stars on close orbits around Sagittarius A* allows us to precisely probe the gravitational field around the closest massive black hole to Earth, to test General Relativity, and to determine the properties of the black hole,” explains Genzel. The new observations, combined with the team’s previous data, confirm that the stars ...
14 Δεκ 2021 · Animated sequence of ESO’s Very Large Telescope Interferometer (VLTI) images of stars around the Milky Way’s central black hole. This animation shows the orbits of the stars S29 and S55 as they move close to Sagittarius A* (center), the supermassive black hole at the heart of the Milky Way.
12 Μαΐ 2022 · These calculations, done by tracking how stars orbit Sagittarius A*, provided strong evidence that the radio source is so massive and dense that it could be nothing but a black hole.
26 Ιουν 2003 · The center of the Milky Way lies behind a dusty cloud of gas and a clustering of stars in the constellation Sagittarius. The closest object to the actual centre, discovered in 1974, is a bright compact source of radio waves known as Sagittarius A*.
