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Tamaño y forma de la luna de Saturno Titán, Titán
Howard A Zebker1, Bryan Stiles, Scott Hensley
1Department of Geophysics, Stanford University, Stanford, CA 94305, USA. zebker@stanford.edu
Science (New York, N.Y.)
|April 4, 2009
Resumen
La luna de Saturno Titán tiene una forma ligeramente oblada, con mediciones precisas que revelan sus dimensiones. Esta forma única sugiere que Titán puede haberse formado más cerca de Saturno, lo que influye en sus características geológicas y la distribución de los lagos de hidrocarburos.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Astrogeología y Astrogeología.
- Dinámica del sistema de Saturno Dinámica del sistema de Saturno
Sus antecedentes:
- Titán, la luna más grande de Saturno, exhibe complejos procesos geológicos y atmosféricos.
- Estudios anteriores sugirieron que la forma de Titán estaba cerca del equilibrio hidrostático.
- La misión Cassini proporcionó datos sin precedentes sobre las características físicas de Titán.
Objetivo del estudio:
- Para determinar con precisión la forma y las dimensiones de Titán utilizando los datos de Cassini.
- Para investigar las implicaciones de la forma de Titán en su formación y evolución.
- Para correlacionar la forma de Titán con las características de la superficie y la distribución de hidrocarburos.
Principales métodos:
- Análisis del subsistema de imágenes de Cassini y datos de radar de apertura sintética.
- Aplicación de una expansión armónica esférica de cuarto orden para derivar los radios.
- Comparación de la forma observada con modelos de elipsoides triaxiales de rotación sincrónica y hidrostática.
Principales resultados:
- Los radios polar norte, polar sur y ecuatorial medio de Titán se midieron con alta precisión.
- El radio medio de Titán es de 2574,73 +/- 0,09 km.
- La forma de Titán es mejor aproximada por un elipsoide triaxial que orbita más cerca de Saturno.
Conclusiones:
- La forma ligeramente oblata de Titán sugiere que puede haberse formado más cerca de Saturno.
- La mayoría de las características de la superficie no están correlacionadas con la topografía, lo que indica procesos distintos a la tectónica.
- Los radios polares deprimidos apoyan un modelo de hidrocarburos geopotenciales para el confinamiento de lagos en latitudes altas.
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