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Un meteorito basáltico anómalo del cinturón principal más interno
Philip A Bland1, Pavel Spurny, Martin C Towner
1IARC, Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK. p.a.bland@imperial.ac.uk
Science (New York, N.Y.)
|September 19, 2009
Resumen
Una reciente caída de meteoritos, distinta del asteroide 4 Vesta, sugiere una nueva fuente de meteoritos basálticos. Su órbita indica un origen en el cinturón principal interno, apoyando modelos de evolución planetesimal.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Cosmoquímica es la cosmoquímica.
- La astronomía es la astronomía.
Sus antecedentes:
- La mayoría de los meteoritos basálticos se originan en el asteroide 4 Vesta.
- Comprender los orígenes de los meteoritos proporciona información sobre la evolución temprana del sistema solar.
Objetivo del estudio:
- Para investigar el origen de un meteorito basáltico con propiedades orbitales inusuales.
- Para explorar la posibilidad de precursores de asteroides tipo V no relacionados con Vesta para los meteoritos.
Principales métodos:
- Triangulación de las observaciones de bolas de fuego para determinar las órbitas de los meteoritos y las ubicaciones de caída.
- Análisis de la composición isotópica del oxígeno.
- Modelado orbital para inferir el origen del cuerpo padre del meteorito.
Principales resultados:
- Una reciente caída de meteorito exhibió características orbitales e isótopos de oxígeno distintos de los vinculados a 4 Vesta.
- El modelado orbital sugirió que el meteorito se originó en el cinturón de asteroides principal más interno.
- El cuerpo progenitor es probablemente un asteroide tipo V, pero no está relacionado con Vesta.
Conclusiones:
- Los precursores de asteroides tipo V para los meteoritos basálticos pueden existir en el cinturón principal interno, separado de 4 Vesta.
- Los hallazgos se alinean con los modelos que predicen la formación y supervivencia de asteroides diferenciados en la región del planeta terrestre.
- Esto sugiere un origen más diverso para los meteoritos basálticos de lo que se suponía anteriormente.
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