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El asteroide 21 Lutetia: masa baja, alta densidad
M Pätzold1, T P Andert, S W Asmar
1Rheinisches Institut für Umweltforschung, Abteilung Planetenforschung, an der Universität zu Köln, 50931 Cologne, Germany. martin.paetzold@uni-koeln.de
Science (New York, N.Y.)
|October 29, 2011
Resumen
Los datos de la nave espacial Rosetta revelaron que el asteroide 21 Lutetia tiene una masa de 1.700 × 10 ^ 18 kg y una densidad a granel de 3.4 × 10 ^ 3 kg / m ^ 3, ofreciendo información sobre su composición.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Investigación de asteroides Investigación de asteroides.
- Análisis de misiones espaciales Análisis de misiones espaciales
Sus antecedentes:
- El asteroide 21 Lutetia es un objetivo clave para comprender la composición y formación de asteroides.
- Estudios anteriores carecían de mediciones precisas de masa y densidad para 21 Lutetia.
Objetivo del estudio:
- Para determinar con precisión la masa del asteroide 21 Lutetia.
- Para calcular la densidad a granel de 21 Lutetia para inferir su estructura interna y composición.
Principales métodos:
- Utilizó datos de desplazamiento Doppler de las señales de radio de la nave espacial Rosetta durante su sobrevuelo de 21 Lutetia.
- Se aplicó un ajuste de mínimos cuadrados a las observaciones de frecuencia residual, corrigiendo las contribuciones de Doppler que no son de Lutetia.
- Datos de volumen integrados de la cámara Rosetta OSIRIS para calcular la densidad masiva.
Principales resultados:
- Se ha determinado que la masa del asteroide 21 Lutetia es de (1,700 ± 0,017) × 10^18 kg.
- Se calculó la densidad a granel de 21 Lutetia como (3,4 ± 0,3) × 10 ^ 3 kg / m ^ 3,3.
- Estas mediciones proporcionan datos cruciales para la composición de asteroides y estudios interiores.
Conclusiones:
- La masa precisa y la densidad de 21 Lutetia se han establecido a través de mediciones de naves espaciales.
- La densidad de masa determinada ofrece pistas significativas con respecto a la composición y estructura interna del asteroide.
- Este estudio mejora nuestra comprensión de los asteroides tipo C y su lugar en el sistema solar.
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