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Ciencia de los cometas. Propiedades del subsuelo y actividad temprana del cometa 67P/Churyumov-Gerasimenko
Samuel Gulkis1, Mark Allen2, Paul von Allmen2
1Jet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA. samuel.gulkis@jpl.nasa.gov.
Science (New York, N.Y.)
|January 24, 2015
Resumen
El cometa 67P/Churyumov-Gerasimenko fue descubierto
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Ciencia de los Cometas Ciencia de los Cometas
- Astrobiología Astrobiología.
Sus antecedentes:
- El transporte de calor y la sublimación del hielo son claves para entender la evolución de los cometas.
- El cometa 67P/Churyumov-Gerasimenko proporciona un estudio de caso único para estos procesos.
Objetivo del estudio:
- Para mapear las temperaturas del subsuelo y los espectros de vapor de agua del cometa 67P/Churyumov-Gerasimenko.
- Para investigar la relación entre el transporte de calor, la sublimación del hielo y la actividad cometaria.
Principales métodos:
- Utilizó el instrumento de microondas en el Rosetta Orbiter (MIRO) a longitudes de onda de 1.6 mm y 0.5 mm.
- Analizó mapas de temperatura subterránea y espectros de vapor de agua.
Principales resultados:
- La velocidad de producción de H2O varió de 0.3 a 1.2 kg s(-1), relacionada con la rotación y la forma del núcleo.
- La desgasificación de agua se localizó en el cometa.
- Cuello y cuello, cuello y cuello.
- región. región.
- Las temperaturas del subsuelo exhibieron variaciones estacionales y diurnas.
Conclusiones:
- La radiación submilimétrica se originó en profundidades similares a la profundidad de la piel térmica diurna.
- Una baja inercia térmica (1050 J K{-1) m{-2) s{-0.5)) sugiere una superficie aislante en polvo.
- Estos hallazgos ofrecen información sobre la formación y evolución de los cometas.
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