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El campo de gravedad y la estructura interior de Encélado

L Iess¹, D J Stevenson, M Parisi

¹Dipartimento di Ingegneria Meccanica e Aerospaziale, Sapienza Università di Roma, via Eudossiana 18, 00184 Rome, Italy.

Science (New York, N.Y.)

|April 5, 2014

Resumen

Los datos de la misión Cassini revelan que Encélado tiene un océano bajo la superficie. Este mar regional, ubicado a 30-40 km de profundidad, explica las anomalías de masa y sugiere un interior diferenciado para Saturno.

Área de la Ciencia:

Ciencias planetarias Ciencias planetarias.
Astrogeología y Astrogeología.
La geofísica es la geofísica.

Sus antecedentes:

Encélado, una pequeña luna activa de Saturno, es un objetivo clave para la misión Cassini.
Comprender su estructura interna es crucial para evaluar su potencial habitabilidad.

Objetivo del estudio:

Para determinar el campo de gravedad cuádrupolo y la asimetría hemisférica de Encélado.
Para investigar la estructura del subsuelo y la composición interna de Encelado.

Principales métodos:

Análisis de los datos Doppler de tres sobrevuelos de la nave espacial Cassini.
Cálculo de los coeficientes armónicos cuádrupolos (J2, C22) y el momento de inercia.

Principales resultados:

Una anomalía de masa negativa en la región del polo sur, compensada por una anomalía subterránea positiva.
Evidencia de un mar subterráneo regional a profundidades de 30-40 km, que se extiende hasta ~ 50 ° S latitud.
Leve desviación del equilibrio hidrostático y un momento de inercia que sugiere un cuerpo diferenciado con un núcleo de baja densidad.

Conclusiones:

Los datos del campo gravitatorio apoyan firmemente la existencia de un océano subterráneo en Encélado.
Encélado exhibe una diferenciación interna significativa, con implicaciones para su actividad geológica y evolución.

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