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Imágenes del asteroide 21 Lutetia: un remanente planetesimal del sistema solar temprano
1Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany. sierks@mps.mpg.de
Science (New York, N.Y.)
|October 29, 2011
Resumen
El asteroide 21 Lutetia muestra una geología compleja y una alta densidad, lo que sugiere que es un planetesimal primordial. Este hallazgo contrasta con los asteroides más pequeños, que probablemente sean fragmentos o pilas de escombros.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Investigación de asteroides Investigación de asteroides.
- Geología Geología Geología.
Sus antecedentes:
- Misiones anteriores revelaron que los asteroides más pequeños a menudo están fragmentados o son pilas de escombros.
- La naturaleza del asteroide 21 Lutetia seguía siendo menos comprendida en comparación con los cuerpos más pequeños.
Objetivo del estudio:
- Para investigar las características geológicas y la densidad del asteroide 21 Lutetia.
- Para determinar si 21 Lutetia representa una clase diferente de asteroides en comparación con los más pequeños.
Principales métodos:
- Análisis de imágenes de las cámaras del Sistema de Imágenes Remotas Ópticas, Espectroscópicas e Infrarrojas (OSIRIS) de la nave espacial Rosetta.
Principales resultados:
- 21 Lutetia exhibe una geología compleja, que incluye una gruesa capa de regolito y deslizamientos de tierra en la región polar norte.
- La densidad medida de 3.4 ± 0.3 g/cm3 se encuentra entre las más altas registradas para asteroides.
- Las características de la superficie sugieren una edad antigua.
Conclusiones:
- La compleja geología, la superficie antigua y la alta densidad sugieren fuertemente que 21 Lutetia es un planetesimal primordial.
- Las características de Lutetia lo diferencian de los asteroides más pequeños y fragmentados previamente estudiados.
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