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Amy A Simon¹, Hannah H Kaplan², Victoria E Hamilton²

¹Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA. amy.simon@nasa.gov.

Science (New York, N.Y.)

|October 9, 2020

Resumen

El asteroide Bennu

Área de la Ciencia:

Ciencias planetarias
Astrogeología
Geoquímica orgánica

Sus antecedentes:

El asteroide (101955) Bennu es un asteroide carbonoso en una órbita que cruza la Tierra.
Se cree que Bennu se formó a partir de fragmentos de una antigua colisión en el cinturón principal de asteroides.

Objetivo del estudio:

Para investigar las propiedades de la superficie y la composición del asteroide Bennu.
Analizar la distribución y la naturaleza de los materiales orgánicos y carbonatados en la superficie de Bennu.

Principales métodos:

Resolución espacial de la espectroscopia visible y del infrarrojo cercano de Bennu.
Análisis de las características de absorción, particularmente una banda de 3,4 micrómetros, a través de la superficie del asteroide.

Principales resultados:

Se detectó una característica de absorción ubicua de 3,4 micrómetros, atribuida a los materiales orgánicos y carbonatados.
La forma y la profundidad de esta característica varían a través de la superficie de Bennu, con las absorciones más profundas encontradas en rocas individuales.
No se encontró correlación entre la característica de absorción de 3,4 micrómetros y la temperatura, la reflectancia, la pendiente espectral o los minerales hidratados.

Conclusiones:

La superficie de Bennu exhibe una distribución heterogénea de materiales orgánicos y carbonatados.
Las variaciones en la característica de absorción de 3,4 micrómetros pueden deberse a diferencias en la abundancia de material, exposición reciente o procesos de intemperie espacial.
Estos hallazgos contribuyen a comprender la composición y la evolución de los asteroides carbonosos.

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