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Campo de gravedad, forma y momento de inercia de Titán
Luciano Iess1, Nicole J Rappaport, Robert A Jacobson
1Dipartimento di Ingegneria Aerospaziale ed Astronautica, Università La Sapienza, via Eudossiana 18, 00184 Rome, Italy. luciano.iess@uniroma1.it
Resumen
La Cassini también es Cassini.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geofísica es la geofísica.
- La astrometría es la astrometría.
Sus antecedentes:
- La estructura interna y la forma de Titán son clave para entender su evolución.
- Los modelos anteriores sugerían un interior diferenciado, pero faltaban datos precisos.
Objetivo del estudio:
- Para determinar la masa precisa y el campo de gravedad de Titán utilizando datos de seguimiento de radio de la nave espacial Cassini.
- Para investigar la estructura interna de Titán, su estado de diferenciación y su forma.
Principales métodos:
- Seguimiento de radio preciso de la nave espacial Cassini durante su misión.
- Análisis de armónicos gravitacionales y el resultante geoide y topografía.
Principales resultados:
- Se determinaron las armónicas de masa y gravedad de Titán (hasta el grado 3).
- El campo cuádrupolo indica la relajación hidrostática debido a las fuerzas de marea y de rotación.
- Un momento inferido del factor de inercia de ~0.34 sugiere una diferenciación incompleta.
- La forma de equilibrio de Titán es un elipsoide triaxial con diferencias específicas de semiejes.
- Las variaciones del geoide no hidrostático son pequeñas en relación con las anomalías topográficas.
Conclusiones:
- La estructura interna de Titán implica una separación imperfecta entre roca y hielo o un núcleo de silicato rico en agua.
- La compensación observada sugiere un interior cálido de hielo en profundidad.
- La forma y el campo de gravedad de Titán son consistentes con un cuerpo hidrostáticamente relajado.
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