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Published on: February 12, 2013
Nuevos horizontes cartografía de Europa y Ganímedes
W M Grundy1, B J Buratti, A F Cheng
1Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA. mshowalter@seti.org
Science (New York, N.Y.)
|October 13, 2007
Resumen
Los datos de New Horizons revelan que las lunas de Júpiter Europa y Ganímedes tienen hielo de agua y contaminantes hidratados, lo que sugiere fuentes de material externo para Europa y mejora los mapas de composición de Ganímedes.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La astronomía es la astronomía.
- Exploración del espacio Exploración espacial
Sus antecedentes:
- Las lunas heladas de Júpiter, Europa y Ganímedes, son objetivos clave en la búsqueda de vida extraterrestre.
- Las observaciones anteriores proporcionaron datos limitados sobre la composición de estas lunas.
Objetivo del estudio:
- Para analizar los datos del sobrevuelo de la nave espacial New Horizons por Europa y Ganímedes.
- Mapear la composición de la superficie y las propiedades de dispersión de los satélites jovianos.
Principales métodos:
- Utilizó imágenes espectrales visibles e infrarrojas de la nave espacial New Horizons.
- Analizó la absorción de hielo de H2O y las firmas de contaminantes hidratados.
- Características de superficie mapeadas y propiedades de dispersión de luz.
Principales resultados:
- Los datos de infrarrojos revelaron la absorción de hielo H2O y contaminantes hidratados en ambas lunas.
- La evidencia apoya una fuente exógena para los materiales superficiales no helados de Europa.
- Los mapas de composición del hemisferio orientado a Júpiter de Ganímedes fueron mejorados significativamente.
- Las imágenes visuales de Europa detallan sus valles arqueados y la dispersión de luz isotrópica.
Conclusiones:
- Los hallazgos proporcionan información crucial sobre la composición de la superficie y la historia de Europa y Ganímedes.
- Los datos apoyan las teorías de deposición de material externo en Europa.
- Los mapas de composición mejorados ayudan a la futura investigación de Ganímedes.
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