On October 16, 2002, an international team led by Rainer Schödel of the Max Planck Institute for Extraterrestrial Physics reported the observation of the motion of the star S2 near Sagittarius A* over a period of ten years.
Strelec A* á zvézdica (Sagittarius A*, okrajšava Sgr A*) je svetel in zelo gost vir radijskega sevanja v središču naše Galaksije kot del večjega astronomskega pojava v tem območju (Strelec A) na razdalji 26.000 svetlobnih let.