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La velocidad de giro del asteroide (54509) 2000 PH5 está aumentando debido al efecto YORP
Patrick A Taylor1, Jean-Luc Margot, David Vokrouhlicky
1Department of Astronomy, Cornell University, Ithaca, NY 14853-6801, USA. ptaylor@astro.cornell.edu
Science (New York, N.Y.)
|March 10, 2007
Resumen
El efecto Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP), causado por la luz solar, es responsable del aumento de la velocidad de giro del asteroide cercano a la Tierra 2000 PH5.5. Este hallazgo apoya el efecto YORP.
Área de la Ciencia:
- * Ciencias planetarias Ciencias planetarias
- * Dinámica de los asteroides * Dinámica de los asteroides
- * La exploración del sistema solar.
Sus antecedentes:
- * Los asteroides cercanos a la Tierra (NEAs) exhiben diversas velocidades de giro, con un notable déficit de rotadores rápidos.
- * Se supone que el efecto Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP), un par de re-radiación térmica, influye en los estados de espín de NEA.
- * La comprensión de la evolución del giro de la NEA es crucial para la evaluación del peligro de impacto y la comprensión de las poblaciones de asteroides.
Objetivo del estudio:
- * Para investigar la causa del espín observado del asteroide cercano a la Tierra (54509) 2000 PH5.5.
- * Para validar el efecto YORP como un factor significativo en la dinámica de rotación de NEA.
- * Explorar las implicaciones de los cambios de espín inducidos por YORP para las poblaciones de asteroides y la formación binaria.
Principales métodos:
- * Análisis combinado de datos de observación óptica y radar a largo plazo del asteroide 2000 PH5.5.
- * Comparación de los cambios medidos en la velocidad de giro con las predicciones teóricas del efecto YORP.
- * Utilizó propiedades físicas determinadas por radar (tamaño, forma, estado de giro) de 2000 PH5 para la validación del modelo.
Principales resultados:
- * Se detectó un aumento continuo en la velocidad de giro del asteroide 2000 PH5.
- * El spin-up observado está en fuerte acuerdo con las predicciones teóricas del efecto YORP para las características del 2000 PH5.
- * Confirmó el papel del efecto YORP en la aceleración de la rotación de esta NEA.
Conclusiones:
- * El efecto YORP se confirma como el principal impulsor de la aceleración de giro del asteroide 2000 PH5.5.
- * Esto proporciona una fuerte evidencia para el efecto YORP que explica la distribución anómala de la velocidad de giro en pequeños asteroides.
- * El efecto YORP es un mecanismo plausible para la formación de sistemas binarios de asteroides.
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