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Descubrimiento del sistema triple de asteroides 87 Sylvia El descubrimiento del sistema triple de asteroides

Franck Marchis¹, Pascal Descamps, Daniel Hestroffer

¹University of California at Berkeley, Department of Astronomy, 601 Campbell Hall, Berkeley, California 94720, USA. fmarchis@berkeley.edu

|August 12, 2005

Resumen

Los científicos descubrieron el primer sistema de asteroides triples en el cinturón principal, con un gran asteroide primario y dos lunas más pequeñas. Este hallazgo ofrece información sobre la formación y estructura de los asteroides.

Área de la Ciencia:

La astronomía y la astrofísica.
Ciencias planetarias Ciencias planetarias.

Sus antecedentes:

Los asteroides binarios han sido confirmados, pero no se conocían previamente sistemas triples.
Los asteroides son restos del sistema solar primitivo, ofreciendo pistas sobre su formación.

Objetivo del estudio:

Para informar de la primera detección inequívoca de un sistema triple de asteroides.
Para caracterizar los componentes del sistema y la dinámica orbital.
Para inferir el mecanismo de formación y la estructura interna del asteroide primario.

Principales métodos:

Detección por observación del sistema triple.
Estimación de los elementos orbitales de las lunas pequeñas.
Refinamiento de la forma del asteroide primario utilizando datos orbitales.
Cálculo de la masa y la densidad para determinar la estructura interna.

Principales resultados:

Descubrimiento de un sistema triple en el cinturón principal: 87 Sylvia (280 km) con dos lunas pequeñas a 710 km y 1.360 km.
Las órbitas lunares son ecuatoriales, circulares y progradas, lo que indica un origen común.
87 Sylvia exhibe una estructura de montones de escombros con una porosidad del 25-60%.

Conclusiones:

El sistema triple probablemente se formó a partir de un solo evento de colisión disruptiva.
El asteroide primario se acrecentó a partir de fragmentos, mientras que las lunas se formaron a partir de escombros.
Este descubrimiento valida las predicciones teóricas anteriores de tales sistemas.

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