A star used in the Galactic-centre stellar-orbit experiments. The two designations refer to the same object in the SIMBAD catalogue.[ref]
S2 in SIMBAD by Centre de données astronomiques de Strasbourg. Identifiers EG97 S2 and GKM98 S0-2
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S2 is a star located in the vicinity of the supermassive black hole at the center of the Milky Way Galaxy, specifically in the region known as Sagittarius A* (Sgr A*). It is an interesting object for astronomers because it has a highly elliptical orbit around the black hole, completing a revolution roughly every 16 years.