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Un radio similar al de Plutón y un alto albedo para el planeta enano Eris debido a una ocultación

B Sicardy¹, J L Ortiz, M Assafin

¹LESIA-Observatoire de Paris, CNRS, Université Pierre et Marie Curie, Université Paris-Diderot, 11, Rue Marcelin Berthelot, 92195 Meudon cedex, France. bruno.sicardy@obspm.fr

|October 28, 2011

Resumen

El planeta enano Eris, un objeto transneptuniano distante, tiene un radio de 1.163 km y un alto albedo, similar al de Plutón. Los científicos no detectaron ninguna atmósfera significativa, lo que sugiere un colapso debido a su ambiente frío.

Área de la Ciencia:

La astronomía y la astrofísica.
Ciencias planetarias Ciencias planetarias.
Los objetos transneptunianos son objetos transneptunianos.

Sus antecedentes:

Eris es un planeta enano y un objeto transneptuniano, significativamente más lejos de la Tierra que Plutón.
Su gran distancia hace que estudiar su tamaño y su atmósfera sea un desafío.

Objetivo del estudio:

Determinar las características físicas de Eris, incluyendo su tamaño, forma y propiedades atmosféricas.
Para comparar Eris con Plutón basado en datos recién adquiridos.

Principales métodos:

Observación de una ocultación estelar de múltiples cuerdas por Eris el 6 de noviembre de 2010.
Análisis de la curva de luz para inferir la forma, el radio y la densidad de Eris.

Principales resultados:

Eris es esférica con un radio de 1.163 ± 6 km y una densidad de 2.52 ± 0.05 g/cm3.
Se midió un alto albedo geométrico visible (Pv = 0,96).
No se detectó ninguna atmósfera significativa, con una presión superficial por debajo de ~1 nanobar.

Conclusiones:

Eris es comparable en tamaño a Plutón, lo que le ha valido el apodo de "gemelo de Plutón".
Su superficie brillante puede ser el resultado de una atmósfera colapsada, potencialmente sublimándose a medida que se acerca al perihelio.
Los hallazgos proporcionan información sobre la naturaleza de los planetas enanos en el sistema solar exterior.

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