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La geomorfología, el color y las propiedades térmicas de Ryugu: implicaciones para los procesos del cuerpo madre
S Sugita1,2, R Honda3, T Morota4
1The University of Tokyo, Tokyo 113-0033, Japan. sugita@eps.s.u-tokyo.ac.jp.
Science (New York, N.Y.)
|March 21, 2019
Resumen
La misión Hayabusa2 reveló el asteroide Ryugu
Área de la Ciencia:
- Ciencias planetarias
- La astronomía
- La exploración espacial
Sus antecedentes:
- El asteroide Ryugu es un asteroide carbonoso cercano a la Tierra.
- Se cree que se formó a partir de un cuerpo padre rico en hielo de agua y moléculas orgánicas.
- Comprender la composición y la historia de Ryugu ofrece información sobre los primeros materiales del Sistema Solar.
Objetivo del estudio:
- Para analizar las características de la superficie y la composición del asteroide 162173 Ryugu.
- Para investigar el origen y la evolución de los asteroides carbonosos.
- Para evaluar el potencial de Ryugu como objetivo de la misión de retorno de muestras.
Principales métodos:
- Imágenes multicolores globales de la nave espacial Hayabusa2.
- Análisis geomorfológico de las características de la superficie como crestas, dicotomía, rocas y cráteres.
- Análisis de las propiedades espectrales de los materiales superficiales y las rocas.
Principales resultados:
- Ryugu exhibe una cresta circum-equatorial, dicotomía este-oeste, rocas abundantes y cráteres de impacto.
- Las estimaciones de la edad de la superficie sugieren un reciente resurgimiento del medidor superior.
- Ryugu es uno de los cuerpos más oscuros conocidos del Sistema Solar, con propiedades rocosas que sugieren una deshidratación moderada.
Conclusiones:
- Las características de la superficie de Ryugu y las propiedades de la roca son consistentes con un cuerpo padre que experimentó calentamiento interno y deshidratación.
- La uniformidad en el color apoya una historia de deshidratación parcial.
- Estos hallazgos mejoran nuestra comprensión de la formación y evolución de los asteroides carbonosos.
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