Rincón del Doll — laboratory investigation of reported space-debris fragments

Official source account — 2021 annual report, printed page 87: CIAE examined a metal sample reportedly recovered near Rincón del Doll in 1991 and later described as translucent or exotic. Chemical and microstructural tests identified precipitation-hardening stainless steel consistent with terrestrial aerospace alloys; laser backlighting showed no translucency. CIAE considered the composition, recovery history and regional debris fall compatible with Salyut 7 or its attached module. It classified the explanation Type A, while the precise fragment provenance remained dependent on the reported chain of custody. 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.