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La historia de colisiones violentas del asteroide 4 Vesta
S Marchi1, H Y McSween, D P O'Brien
1NASA Lunar Science Institute, Boulder, CO, USA. marchi@boulder.swri.edu
Science (New York, N.Y.)
|May 15, 2012
Resumen
La superficie de Vesta muestra una significativa diferencia norte-sur en la formación de cráteres debido a las grandes colisiones. El hemisferio sur resurgió por impactos, el más grande ocurrió hace aproximadamente mil millones de años.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Investigación de asteroides Investigación de asteroides.
- Formación del sistema solar Formación del sistema solar
Sus antecedentes:
- Vesta es un protoplaneta grande y diferenciado en el cinturón principal de asteroides.
- Se formó al principio de la historia del sistema solar.
- La nave espacial Dawn proporcionó extensas imágenes de la superficie de Vesta.
Objetivo del estudio:
- Para analizar el registro de cráteres de Vesta y la historia de la superficie.
- Para entender la historia del impacto y su efecto en los hemisferios de Vesta.
- Para correlacionar los eventos de impacto con la formación de la familia de asteroides Vesta.
Principales métodos:
- Análisis de imágenes de alta resolución de la nave espacial Dawn.
- Mapeo y caracterización de cráteres de impacto.
- Reconstrucción de la historia de la colisión.
Principales resultados:
- Vesta exhibe una pronunciada dicotomía norte-sur en su registro de cráteres.
- El hemisferio norte conserva terrenos más antiguos.
- El hemisferio sur fue alterado significativamente por dos grandes eventos de impacto, el más reciente hace aproximadamente mil millones de años.
Conclusiones:
- La evolución de la superficie de Vesta está dominada por los impactos.
- Los principales impactos del hemisferio sur restablecen su superficie.
- El evento de gran impacto más joven se alinea con la edad estimada de la familia de asteroides Vesta, lo que sugiere un origen común.
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