San Nicolás de los Arroyos — Province of Buenos Aires.

Official source account — 2021 annual report, printed page 31: A witness at San Nicolás de los Arroyos photographed a bright point and attributed movements to it. CIAE compared the surrounding stellar pattern with a Stellarium reconstruction and matched the object to Sirius. The agency explained the apparent motion as an autokinetic effect, in which an isolated stationary light seems to move in darkness. It classified the stellar identification Type A. The summaries distinguish reported observations from the agency’s proposed explanations. Source Type A/B ratings describe explanatory confidence and are not encounter classes. The map uses an approximate GeoNames locality centroid, not the observation point.