Leonardo Kosaca (1) — Federal Capital; Buenos Aires

Official source account — 2020 annual report, printed page 69: Leonardo Kosaca watched a light for about thirty minutes as it descended westward and disappeared behind buildings, recording photographs and video. CIAE's reconstruction placed Sirius low in the same sector. Only one comparable point appeared in the video. The agency identified the star and attributed the changing colours to atmospheric scintillation near the horizon, classifying the case 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.