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Anne Verbiscer1, Richard French, Mark Showalter
1Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA. verbiscer@virginia.edu
Science (New York, N.Y.)
|February 10, 2007
Resumen
La luna de Saturno Encélado, un cuerpo geológicamente activo, expulsa partículas de hielo que aumentan el albedo de otras lunas en el anillo E. Las observaciones del Hubble confirman que estos satélites tienen albedos cerca o por encima de la unidad.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
Sus antecedentes:
- Encélado es una luna geológicamente activa de Saturno.
- El anillo E de Saturno es un anillo vasto y tenue compuesto de partículas de hielo de agua.
- El albedo de los cuerpos celestes indica la cantidad de luz que reflejan.
Objetivo del estudio:
- Para investigar la fuente de albedos inusualmente altos observados en satélites dentro del anillo E de Saturno.
- Para analizar el impacto de la actividad de Encelado en los cuerpos celestes circundantes.
Principales métodos:
- Utilizó las observaciones del Telescopio Espacial Hubble.
- Centrado en los datos obtenidos en verdadera oposición el 13 y 14 de enero de 2005.
- Se analizaron los albedos geométricos medios de los satélites incrustados dentro del anillo E.
Principales resultados:
- Encélado expulsa activamente partículas de hielo de agua.
- Estas partículas contribuyen a los altos albedo de otros satélites en el anillo E.
- Los albedos geométricos medios observados de estos satélites se aproximan o exceden la unidad.
Conclusiones:
- La actividad criovolcánica de Encélado es responsable de la apariencia brillante de los satélites del anillo E.
- Las partículas de hielo de la luna mejoran significativamente la reflectividad de sus vecinos.
- Este fenómeno pone de relieve la interacción dinámica entre Encélado y su entorno.
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