S4716
S4716is anS starlocated at the center of theMilky Way galaxyorbiting the supermassive blackholeSgr A*at the speed of 8,000 kilometres per second in closest approach of 100AU.As of July 2022, the orbital period of S4716 was the shortest known of any star in the Milky Way galaxy. It orbits the Sgr A* in 4.0 years, on an elliptical orbit with an eccentricity of 0.75. Its closest approach to Sgr A* is 15 billion kilometers (about the distance to the space probe Voyager 2 in 2022, or three times the distance of Neptune from the Sun), while its farthest approach is 100 billion kilometers. The star can be detected by NIRC2 (Keck),OSIRIS(Keck), SINFONI (VLT), NACO (VLT) and GRAVITY (VLT).[1]
The star's radius is 2.45 solar radii.[citation needed]
References
[edit]- ^Peißker, Florian; Eckart, Andreas; Zajaček, Michal; Britzen, Silke (2022-07-05)."Observation of S4716 -- a Star with a 4 yr Orbit around Sgr A*".The Astrophysical Journal.933(1): 49.arXiv:2207.02142v1.Bibcode:2022ApJ...933...49P.doi:10.3847/1538-4357/ac752f.S2CID250279828.
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