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Las primeras imágenes del asteroide 243 ida
Science (New York, N.Y.)
|September 9, 1994
Resumen
La misión Galileo reveló el asteroide 243 Ida, un cuerpo irregular de 56 km con diversas características geológicas. Su antigua superficie sugiere una edad mínima de mil millones de años para la familia Koronis.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología de los asteroides Geología de los asteroides
- Exploración del espacio Exploración espacial
Sus antecedentes:
- La nave espacial Galileo proporcionó las primeras imágenes en primer plano del asteroide 243 Ida.
- El asteroide Ida es un objeto irregular con dimensiones de 56x24x21 kilómetros.
- Ida pertenece a la familia de asteroides Koronis.
Objetivo del estudio:
- Para analizar las características geológicas y las características de la superficie del asteroide 243 Ida.
- Para determinar la edad de la superficie y el equilibrio de cráteres de Ida.
- Para inferir la edad de la familia de asteroides Koronis.
Principales métodos:
- Análisis de imágenes de alta resolución de la nave espacial Galileo.
- Mapeo de características geológicas, incluidas ranuras, bloques, caídas y variaciones de albedo.
- Análisis de la morfología del cráter y de la distribución tamaño-frecuencia.
Principales resultados:
- La superficie de Ida exhibe una rica variedad de características geológicas: ranuras, bloques, caídas, variaciones de albedo, cadenas de cráteres y diversas morfologías de cráteres.
- Se observó una distribución no uniforme de los grandes bloques y ubicaciones preferenciales para los lineamientos y cráteres de suelo oscuro.
- Se infiere una capa de regolito sustancial, con una alta densidad de cráteres que indica un equilibrio de saturación de cráteres.
Conclusiones:
- La superficie del asteroide 243 Ida es geológicamente compleja y antigua.
- La densidad de cráteres sugiere una superficie en equilibrio, apoyando una edad mínima estimada de mil millones de años para Ida.
- Esta edad proporciona una estimación de edad mínima para la familia de asteroides Koronis, que es más antigua de lo que se anticipaba anteriormente.
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