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Arcos y grupos en el anillo hidrológico uraniano

Science (New York, N.Y.)

|January 27, 1995

Resumen

Las imágenes de la Voyager revelan que el anillo lambda de Urano tiene variaciones significativas de brillo y una forma única. Estas características sugieren una luna oculta, pero ninguna luna conocida orbita en la ubicación predicha.

Área de la Ciencia:

Ciencias planetarias Ciencias planetarias.
La astronomía es la astronomía.
Sistemas de anillos Sistemas de anillos.

Sus antecedentes:

El anillo uraniano lambda, parte del sistema de anillos de Urano, exhibe estructuras complejas.
Las observaciones anteriores carecían de la resolución para detallar las variaciones a escala fina dentro del anillo.

Objetivo del estudio:

Para analizar las imágenes de alta resolución de la Voyager del anillo lambda de Urano.
Para investigar las variaciones longitudinales de brillo y forma del anillo.
Para determinar la causa dinámica de las características observadas en los anillos.

Principales métodos:

Reprocesamiento de las imágenes de archivo de las Voyager de Urano.
Análisis fotométrico de las variaciones de brillo de los anillos.
Modelado de dinámica orbital para explicar la estructura de los anillos.

Principales resultados:

El anillo lambda muestra variaciones de brillo longitudinales significativas, comparables a los anillos F de Saturno y los anillos Adams de Neptuno.
Se identificó una periodicidad dominante de cinco ciclos (72 grados) y estructuras más finas.
La forma del anillo se caracteriza por la excentricidad y una variación de amplitud radial de 4 km con una periodicidad de seis ciclos (60 grados).

Conclusiones:

Las características observadas en los anillos son consistentes con las perturbaciones de resonancia de una luna no descubierta.
El semieje mayor inferido de la luna es de 56.479 km.
La masa lunar requerida sugiere que debería haber sido detectable por la Voyager, lo que plantea un misterio.

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