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Abstract:

The Trojan asteroids orbit about the Lagrangian points of Jupiter and the residence times about their present location are very long for most of them. If these bodies originated in the outer Solar System, they should be mainly composed of water ice, but, in contrast with comets, all the volatiles close to the surface would have been lost long ago. Irrespective of the rotation period, and hence the surface temperature and ice sublimation rate, a dust layer exists always on the surface. We show that the timescale for resurfacing the entire surface of the Trojan asteroids is similar to that of the flattening of the red spectrum of the new dust by solar-proton irradiation. This, if the cut-off radius of the size distribution of the impacting objects is between 1 mm and 1 m and its slope is -3, for the entire size range. Therefore, the surfaces of most Trojan asteroids should be composed mainly of unirradiated dust. © 2009 Elsevier Inc. All rights reserved.

Registro:

Documento: Artículo
Título:Collisions, cosmic radiation and the colors of the Trojan asteroids
Autor:Melita, M.D.; Strazzulla, G.; Bar-Nun, A.
Filiación:Instituto de Astronomía y Física del Espacio, Buenos Aires, Argentina
INAF-Osservatorio Astrofisico di Catania, Italy
Department of Geophysics and Planetary Sciences, Tel Aviv University, Tel Aviv, Israel
Palabras clave:Asteroids; Comets; Origin; Solar System; Surfaces; Trojan asteroids
Año:2009
Volumen:203
Número:1
Página de inicio:134
Página de fin:139
DOI: http://dx.doi.org/10.1016/j.icarus.2009.04.024
Título revista:Icarus
Título revista abreviado:Icarus
ISSN:00191035
CODEN:ICRSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00191035_v203_n1_p134_Melita

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Citas:

---------- APA ----------
Melita, M.D., Strazzulla, G. & Bar-Nun, A. (2009) . Collisions, cosmic radiation and the colors of the Trojan asteroids. Icarus, 203(1), 134-139.
http://dx.doi.org/10.1016/j.icarus.2009.04.024
---------- CHICAGO ----------
Melita, M.D., Strazzulla, G., Bar-Nun, A. "Collisions, cosmic radiation and the colors of the Trojan asteroids" . Icarus 203, no. 1 (2009) : 134-139.
http://dx.doi.org/10.1016/j.icarus.2009.04.024
---------- MLA ----------
Melita, M.D., Strazzulla, G., Bar-Nun, A. "Collisions, cosmic radiation and the colors of the Trojan asteroids" . Icarus, vol. 203, no. 1, 2009, pp. 134-139.
http://dx.doi.org/10.1016/j.icarus.2009.04.024
---------- VANCOUVER ----------
Melita, M.D., Strazzulla, G., Bar-Nun, A. Collisions, cosmic radiation and the colors of the Trojan asteroids. Icarus. 2009;203(1):134-139.
http://dx.doi.org/10.1016/j.icarus.2009.04.024