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Sublimación en puntos brillantes en (1) Ceres
A Nathues1, M Hoffmann1, M Schaefer1
1Max Planck Institute for Solar System Research, Goettingen, Germany.
Nature
|December 15, 2015
Resumen
Se descubrieron puntos brillantes y sublimación de hielo de agua en Ceres, lo que sugiere que acrecentó material más allá de la "línea de nieve" del sistema solar. Esto indica actividad geológica en el planeta enano.
Área de la Ciencia:
- Ciencias planetarias
- Astrogeología
- La exploración del sistema solar
Sus antecedentes:
- Ceres, el objeto más grande del cinturón de asteroides, es un planeta enano diferenciado.
- A diferencia de las lunas heladas de Júpiter y Saturno, Ceres carece de fuerzas de marea, lo que sugiere una inercia geológica.
- Las detecciones anteriores de vapor de agua y agua unida en Ceres insinuaron la presencia de hielo en la superficie.
Objetivo del estudio:
- Para investigar la composición y la actividad de las áreas brillantes localizadas en Ceres.
- Para entender los procesos geológicos que ocurren en el planeta enano.
- Para determinar el origen de los materiales acumulados por Ceres.
Principales métodos:
- Análisis de imágenes de una cámara en órbita.
- Identificación espectroscópica de la composición de la superficie.
- Observación de las variaciones diurnas de las características de la superficie.
Principales resultados:
- Descubrimiento de áreas brillantes localizadas en Ceres, consistentes con sulfatos de magnesio hidratados.
- Identificación de un hoyo brillante en el cráter Occator que exhibe probable sublimación de hielo de agua.
- Observación de nubes de neblina diurna dentro del cráter Occator, probablemente por sublimación de hielo o polvo.
Conclusiones:
- Ceres exhibe actividad geológica, particularmente en el cráter Occator.
- La presencia de hielo de agua y composiciones minerales específicas sugieren que Ceres ha acumulado material más allá de la línea de nieve del sistema solar.
- Estos hallazgos desafían la suposición de inercia geológica para los objetos en el cinturón de asteroides que carecen de fuerzas de marea.
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