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El efecto de oposición de la luna: la contribución de una retrodispersión coherente
Science (New York, N.Y.)
|April 23, 1993
Resumen
El efecto de la oposición lunar, un aumento de brillo cerca del ángulo de fase cero, es causado principalmente por la retrodispersión coherente, no por la ocultación de sombras. Este hallazgo impacta en cómo interpretamos las observaciones fotométricas de los cuerpos del sistema solar.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La óptica es la óptica.
- La astronomía es la astronomía.
Sus antecedentes:
- El efecto de oposición, un aumento de brillo cerca del ángulo de fase cero, es un fenómeno observado desde hace mucho tiempo.
- Las explicaciones anteriores atribuían principalmente este efecto a la ocultación de las sombras.
Objetivo del estudio:
- Para investigar la causa subyacente del efecto de la oposición lunar.
- Para diferenciar entre el ocultamiento de sombras y los mecanismos de retrodispersión coherentes.
Principales métodos:
- Reflectancia medida de muestras de suelo lunar a través de varios ángulos de fase.
- Analizó la luz en ambos estados de polarización lineal y circular.
Principales resultados:
- Se observó una disminución en la relación de polarización lineal en el pico de oposición.
- Se observó un aumento en la relación de polarización circular en el pico de oposición.
- Estos cambios de polarización proporcionan evidencia de una retrodispersión coherente.
Conclusiones:
- La retrodispersión coherente es la causa dominante del efecto de la oposición lunar.
- La ocultación de sombras juega un papel mínimo en el efecto de oposición.
- Revisa la interpretación de los datos fotométricos para los cuerpos celestes, incluida la Tierra.
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