Physical properties and orbital stability of the Trojan asteroids

All the Trojan asteroids orbit about the Sun at roughly the same heliocentric distance as Jupiter. Differences in the observed visible reflection spectra range from neutral to red, with no ultra-red objects found so far. Given that the Trojan asteroids are collisionally evolved, a certain degree of...

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Guardado en:
Detalles Bibliográficos
Publicado: 2008
Materias:
Asteroids
Comets
composition
dynamics
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00191035_v195_n2_p686_Melita
http://hdl.handle.net/20.500.12110/paper_00191035_v195_n2_p686_Melita
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00191035_v195_n2_p686_Melita
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spelling paper:paper_00191035_v195_n2_p686_Melita2023-06-08T14:40:14Z Physical properties and orbital stability of the Trojan asteroids Asteroids Comets composition dynamics All the Trojan asteroids orbit about the Sun at roughly the same heliocentric distance as Jupiter. Differences in the observed visible reflection spectra range from neutral to red, with no ultra-red objects found so far. Given that the Trojan asteroids are collisionally evolved, a certain degree of variability is expected. Additionally, cosmic radiation and sublimation are important factors in modifying icy surfaces even at those large heliocentric distances. We search for correlations between physical and dynamical properties, we explore relationships between the following four quantities; the normalised visible reflectivity indexes (S′), the absolute magnitudes, the observed albedos and the orbital stability of the Trojans. We present here visible spectroscopic spectra of 25 Trojans. This new data increase by a factor of about 5 the size of the sample of visible spectra of Jupiter Trojans on unstable orbits. The observations were carried out at the ESO-NTT telescope (3.5 m) at La Silla, Chile, the ING-WHT (4.2 m) and NOT (2.5 m) at Roque de los Muchachos observatory, La Palma, Spain. We have found a correlation between the size distribution and the orbital stability. The absolute-magnitude distribution of the Trojans in stable orbits is found to be bimodal, while the one of the unstable orbits is unimodal, with a slope similar to that of the small stable Trojans. This supports the hypothesis that the unstable objects are mainly byproducts of physical collisions. The values of S′ of both the stable and the unstable Trojans are uniformly distributed over a wide range, from 0%/1000 Å to about 15%/1000 Å. The values for the stable Trojans tend to be slightly redder than the unstable ones, but no significant statistical difference is found. © 2008 Elsevier Inc. All rights reserved. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00191035_v195_n2_p686_Melita http://hdl.handle.net/20.500.12110/paper_00191035_v195_n2_p686_Melita
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Asteroids
Comets
composition
dynamics
spellingShingle Asteroids
Comets
composition
dynamics
Physical properties and orbital stability of the Trojan asteroids
topic_facet Asteroids
Comets
composition
dynamics
description All the Trojan asteroids orbit about the Sun at roughly the same heliocentric distance as Jupiter. Differences in the observed visible reflection spectra range from neutral to red, with no ultra-red objects found so far. Given that the Trojan asteroids are collisionally evolved, a certain degree of variability is expected. Additionally, cosmic radiation and sublimation are important factors in modifying icy surfaces even at those large heliocentric distances. We search for correlations between physical and dynamical properties, we explore relationships between the following four quantities; the normalised visible reflectivity indexes (S′), the absolute magnitudes, the observed albedos and the orbital stability of the Trojans. We present here visible spectroscopic spectra of 25 Trojans. This new data increase by a factor of about 5 the size of the sample of visible spectra of Jupiter Trojans on unstable orbits. The observations were carried out at the ESO-NTT telescope (3.5 m) at La Silla, Chile, the ING-WHT (4.2 m) and NOT (2.5 m) at Roque de los Muchachos observatory, La Palma, Spain. We have found a correlation between the size distribution and the orbital stability. The absolute-magnitude distribution of the Trojans in stable orbits is found to be bimodal, while the one of the unstable orbits is unimodal, with a slope similar to that of the small stable Trojans. This supports the hypothesis that the unstable objects are mainly byproducts of physical collisions. The values of S′ of both the stable and the unstable Trojans are uniformly distributed over a wide range, from 0%/1000 Å to about 15%/1000 Å. The values for the stable Trojans tend to be slightly redder than the unstable ones, but no significant statistical difference is found. © 2008 Elsevier Inc. All rights reserved.
title Physical properties and orbital stability of the Trojan asteroids
title_short Physical properties and orbital stability of the Trojan asteroids
title_full Physical properties and orbital stability of the Trojan asteroids
title_fullStr Physical properties and orbital stability of the Trojan asteroids
title_full_unstemmed Physical properties and orbital stability of the Trojan asteroids
title_sort physical properties and orbital stability of the trojan asteroids
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00191035_v195_n2_p686_Melita
http://hdl.handle.net/20.500.12110/paper_00191035_v195_n2_p686_Melita
_version_ 1768543784376729600

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