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Cassini observa el polo sur activo de Encélado
C C Porco1, P Helfenstein, P C Thomas
1Cassini Imaging Central Laboratory for Operations, Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA. carolyn@ciclops.org
Science (New York, N.Y.)
|March 11, 2006
Resumen
Cassini descubrió una región geológicamente activa en el polo sur de Encélado. Esta área presenta un terreno joven, temperaturas cálidas y chorros helados que suministran el anillo E de Saturno, probablemente de agua líquida subterránea.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrobiología Astrobiología.
- Geología Geología Geología.
Sus antecedentes:
- Encélado, la sexta luna más grande de Saturno, exhibe una actividad geológica única.
- Las observaciones anteriores insinuaban actividad subterránea, pero el mapeo detallado era limitado.
Objetivo del estudio:
- Para identificar y caracterizar la provincia geológicamente activa en el polo sur de Encélado.
- Para investigar la fuente de los chorros de partículas heladas que suministran el anillo E de Saturno.
Principales métodos:
- Análisis de imágenes de alta resolución del subsistema científico de imágenes de Cassini (ISS).
- Examen del albedo, el color, la temperatura y las características de la superficie dentro de la región activa.
Principales resultados:
- Identificación de una provincia distinta a aproximadamente 55 grados de latitud sur, delimitada por cordilleras y valles.
- Caracterización del terreno con albedo / color contrastante, temperaturas elevadas y características geológicas jóvenes.
- Observación de estrechas grietas tectónicas con hielo de grano grueso y las temperaturas más altas medidas.
- Confirmación de que los chorros helados que suministran el anillo E de Saturno se originan en esta provincia, impulsados por el vapor de agua de los depósitos de agua líquida subterránea.
Conclusiones:
- La región polar sur de Encélado es una zona geológicamente activa con evidencia de reciente reaparición en la superficie y agua líquida subterránea.
- Las características y fenómenos observados apoyan la hipótesis de un océano subsuperficial en Encélado.
- La forma de la luna sugiere un evento de calentamiento intenso en el pasado, posiblemente relacionado con la resonancia orbital.
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