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Cráteres secundarios en Europa y sus implicaciones para las superficies con cráteres
Edward B Bierhaus1, Clark R Chapman, William J Merline
1Lockheed Martin, Space Exploration Systems, MS S8110, PO Box 179, Denver, Colorado 80201, USA. edward.b.bierhaus@lmco.com
Nature
|October 21, 2005
Resumen
Los pequeños cráteres en lunas heladas como Europa son en su mayoría impactos secundarios, no primarios. Este hallazgo sugiere que la mayoría de los pequeños cráteres en todo el sistema solar también son secundarios, lo que desafía las suposiciones anteriores sobre la datación de la superficie planetaria.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Estudios de cráteres de impacto Estudios de cráteres de impacto
- Exploración del sistema solar Exploración del sistema solar
Sus antecedentes:
- La investigación planetaria tradicionalmente asume que las poblaciones de cráteres de impacto reflejan principalmente impactos directos de asteroides y cometas.
- Las estimaciones de edad de las unidades geológicas en cuerpos de superficie sólida se basan en este supuesto de impacto primario.
- El registro de cráteres es crucial para comprender la evolución planetaria y las edades de la superficie.
Objetivo del estudio:
- Para analizar la población de cráteres en la luna de Júpiter Europa.
- Reevaluar el supuesto de que los cráteres pequeños son predominantemente el resultado de impactos primarios.
- Para investigar el origen de pequeños cráteres (diámetros < 1 km) en Europa.
Principales métodos:
- Análisis de la escasa población de cráteres en Europa.
- Examen estadístico de la distribución del tamaño del cráter.
- Comparación de los datos de cráteres observados con modelos de impacto.
Principales resultados:
- Los cráteres secundarios (formados por material expulsado de impactos más grandes) constituyen aproximadamente el 95% de los pequeños cráteres (< 1 km de diámetro) en Europa.
- Esto indica que los grandes impactos primarios generan significativamente más cráteres secundarios de lo estimado anteriormente.
- El estudio sugiere una escasez de pequeños cometas (< 100 m) en el sistema Joviano recientemente.
Conclusiones:
- La suposición de que los pequeños cráteres son principalmente de impactos directos es incorrecta para Europa.
- Es probable que las pequeñas poblaciones de cráteres en la Luna, Marte y otros cuerpos estén dominadas por impactos secundarios.
- La revisión de los modelos de cráteres es necesaria para una datación precisa de la edad y la comprensión de los procesos de la superficie planetaria.
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