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Iapetus: propiedades de superficie únicas y una dicotomía de color global de las imágenes de Cassini
Tilmann Denk1, Gerhard Neukum, Thomas Roatsch
1Institut für Geologische Wissenschaften, Freie Universität Berlin, 12249 Berlin, Germany. Tilmann.Denk@fu-berlin.de
Science (New York, N.Y.)
|December 17, 2009
Resumen
Las observaciones de la nave espacial Cassini revelan que Iapetus tiene una dicotomía de color global, con los principales materiales del hemisferio siendo más rojos. Esto sugiere un origen exógeno e inició procesos térmicos que forman sus distintos patrones de albedo.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrogeología y Astrogeología.
- Procesos de la superficie Procesos de la superficie
Sus antecedentes:
- La luna de Saturno Iapetus exhibe una distinta dicotomía de color global y patrones de albedo.
- Observaciones anteriores han notado variaciones en el brillo de la superficie y el color a través de Iapetus.
Objetivo del estudio:
- Para analizar los datos del subsistema científico de imágenes de Cassini de Iapetus.
- Para investigar el origen de las dicotomías de color global y albedo de Iapetus.
- Para determinar los procesos que dan forma a las características de la superficie de Iapetus, incluidos los cráteres de impacto.
Principales métodos:
- Imágenes repetidas de Japeto utilizando el subsistema de Ciencias de la Imagen de la nave espacial Cassini desde 2004.
- Análisis de imágenes de alta resolución que revelan cráteres de impacto hasta ~10 metros por píxel.
- Examen de las orientaciones de la pared del cráter y las variaciones de color en los hemisferios.
Principales resultados:
- Se observaron numerosos cráteres de impacto a través de la superficie de Japeto.
- Pequeños cráteres brillantes en el hemisferio oscuro sugieren un espesor de manta oscura de metros o menos.
- Las paredes del cráter muestran efectos diferenciales de iluminación y temperatura, lo que indica la sublimación de hielo de agua.
- Se identificó una dicotomía de color global, con los materiales del hemisferio principal más rojos que los materiales del hemisferio posterior.
Conclusiones:
- La sublimación del hielo de agua impulsada por la temperatura es un proceso clave para los patrones de albedo local en Iapetus.
- La dicotomía de color global, caracterizada por materiales más rojos del lado delantero, apunta a un origen exógeno.
- La dicotomía de color global probablemente inició los procesos térmicos responsables de la dicotomía de albedo global en Iapetus.
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