Other
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..241l&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 241-242
Other
3
Scientific paper
It has been known for a long time that asteroid 4 Vesta presents a crust of basaltic composition. This object is also the main member of the largest asteroidal family in the inner asteroid belt: the Vesta family. The fact that most of the members of the dynamical family with known chemical properties are composed of basalts, -so called V-type asteroids-, and the discovery of the large crater (~450 km) on the surface of Vesta, led to the conclusion that Vesta family was originated on a large cratering event. However, there are several recently identified V-type asteroids that, from the dynamical point of view, do not belong to the Vesta family. This fact raised the question about the origin of such basaltic bodies. There are two possible explanations: (i) they are not related to the same cratering event that formed the Vesta family, or (ii) they were fugitives from the family and arrived to their present locations due to some dynamical mechanism. In this work, we have analyzed this last possibility. First, we have re-determined the Vesta family using the recently updated proper elements database provided by Milani and Kneevi(http://hamilton.dm.unipi.it/astdys). This new family has been compared to the sample of the known V-type asteroids (http://www.daf.on.br/lazzaro/S3OS2-Pub/s3os2.htm). We have found that there are about 20 V-type asteroids that do not belong to the Vesta family. Then, we have performed a detailed dynamical study of the phase space around 4 Vesta, using the direct numerical simulations and the spectral analysis method. We have detected a dense presence of weak two- and three-body mean motion resonances and secular resonances in this region, and analyzed their effects, together with the effect of Yarkovsky forces, on the long term evolution of the actual and fictitious objects. The results indicate that both mean-motion and secular resonances may transport the asteroids outside the Vesta family. However, the dynamical times needed to deliver the objects under question to their present locations, are too large if compared to the estimated age of the family. Also, the effect of Yarkovsky forces is only relevant over very long time scales. In view of this, we need to find other scenarios to explain the existence of the V-type asteroids outside the Vesta family.
Duffard René
Lazzaro Daniela
Michtchenko Tatiana A.
Roig Fernando
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