The Santa Filomena meteorite shower: Trajectory, classification, and opaque phases as indicators of metamorphic conditions

• DOI: 10.1111/maps.13976
• Publication Date: 2023-04-12T12:00:45Z
• Authors: Amanda Tosi; Maria Elizabeth Z...; Diana Paula Andrade; Othon Cabo Winter; Daniela Cardozo M...; Rafael Sfair; Karen Ziegler; Pablo Daniel Perez; Sergio Suarez; Iara Deniz Ornellas; Marcelo Zurita; Julio Cezar Mendes; Alexander Wilhelm...; Wania Wolff
• Keywords: Ordinary chondrite; Parent body; Iron meteorite; Kamacite; Shock metamorphism

Abstract On August 19, 2020, at 13:18—UTC, a meteor event ended as meteorite shower in Santa Filomena, city the Pernambuco State, northeast Brazil. The heliocentric orbital parameters resulting from images by cameras of weather broadcasting system were semimajor axis = 2.1 ± 0.1 au, eccentricity e 0.55 0.03, and inclination i 0.15 o 0.05. data identified body an Apollo object, Earth‐crossing object with pericenter interior to Earth's orbit. chemical, mineralogical, petrological evaluations, well physical analysis, followed several traditional techniques. was H5‐6 S4 W0 ordinary chondrite genomict breccia. large amount metal made metallographic evaluation based on opaque phases possible. monocrystalline kamacite crystals suggest higher type distorted Neumann lines imply least two different shock events. absence plessite phase shows that did not reach highest levels S5 S6. well‐defined polycrystalline taenite is indicative petrologic types 4 5 due conserved internal tetrataenite rim boundaries. presence taenites characteristics Agrell Effect Filomena reheat above 700°C. martensite confirms reheating temperatures <800°C slow cooling rate. Ni contents sizes zoned particles indicate rate ranging 1 10 K Myr −1 .