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La geología y la geofísica del objeto del Cinturón de Kuiper (486958) Arrokoth

J R Spencer¹, S A Stern², J M Moore³

¹Southwest Research Institute, Boulder, CO 80302, USA. spencer@boulder.swri.edu.

Science (New York, N.Y.)

|February 15, 2020

Resumen

La misión New Horizons exploró Arrokoth, un objeto primitivo del Cinturón de Kuiper. Este antiguo cuerpo revela información sobre la formación temprana del Sistema Solar con su geología y proceso de acreción únicos.

Área de la Ciencia:

Ciencias planetarias
Formación del sistema solar
Objetos del Cinturón de Kuiper

Sus antecedentes:

El Cinturón de Kuiper Clásico Frío comprende cuerpos primitivos que preservan las primeras condiciones del Sistema Solar.
Arrokoth (2014 MU69) es un binario de contacto en el Cinturón de Kuiper, visitado por New Horizons.

Objetivo del estudio:

Para analizar las características físicas y geológicas de Arrokoth.
Para entender los mecanismos de acreción de los objetos del Cinturón de Kuiper.

Principales métodos:

Análisis de imágenes y datos de alta resolución de la nave espacial New Horizons en el sobrevuelo de Arrokoth.
Evaluación de las características de la superficie, incluidos cráteres, anillos y satélites.

Principales resultados:

Arrokoth exhibe una superficie lisa y ligeramente craterizada con una geología compleja, distinta de otros cuerpos visitados.
No se detectaron anillos o satélites de más de 180 metros en un radio de 8000 km.
La baja densidad del cráter sugiere una edad de la superficie que se remonta a la formación del Sistema Solar.
Los polos alineados y los ecuadores de los lóbulos de Arrokoth restringen su formación.

Conclusiones:

La naturaleza prístina de Arrokoth ofrece una ventana única en el sistema solar temprano.
La morfología del objeto proporciona restricciones en los procesos de acreción de los cuerpos primordiales.

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