English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/3088
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 3 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título : An investigation of errors in estimates of the cometary nuclei active area fractions
Autor : Gutiérrez, Pedro J. ; Rodrigo Montero, Rafael ; Ortiz, José Luis ; Davidsson, B.
Palabras clave : Comets : general
Solar system : general
Fecha de publicación : ene-2003
Editor: EDP Sciences
Citación : Astronomy and Astrophysics, 401, pp 755-761, (2003)
Resumen: Active area fractions of cometary nuclei are often estimated by comparing the observed water production rates with theoretical rates obtained by applying the fast rotator or subsolar point approximations to spherical model nuclei. Any discrepancy between observed and theoretical production rates is interpreted as a certain degree of dust mantling (or in some cases hyper activity) of the object. We here investigate the typical errors introduced in such active area fraction estimates by the usage of oversimplified spherical model nuclei. This is done by first calculating the production rates of slowly rotating irregular model bodies with different activity patterns on their surfaces and arbitrary spin axis orientations, for which solar illumination is treated properly. Next, the production rates of the spherical model objects under averaged insolation are compared to the production rates of the complex model objects in an attempt to recover the known active area fraction of the latter bodies. We then find that the fast rotator and subsolar point approximations generally yield large over– and underestimates of the active area fraction, depending on the characteristics of the simulated complex nuclei. Acceptable relative errors (<100%) only occur at small heliocentric distances, and the subsolar point approximation yields somewhat better results than the fast rotator approximation.
Descripción : The final version is available at: http://www.aanda.org
URI : http://hdl.handle.net/10261/3088
DOI: 10.1051/0004-6361:20030167
ISSN: 1432-0746
Aparece en las colecciones: (IAA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
91.pdf324 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.