Journal Article

Portrait of Theobalda as a young asteroid family

Bojan Novaković

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 3, pages 1477-1486
Published in print September 2010 | ISSN: 0035-8711
Published online September 2010 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2010.17051.x
Portrait of Theobalda as a young asteroid family

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The (778) Theobalda asteroid family has attracted little attention so far, but in our study we show that it is important in several ways. In this paper, we investigate the origin and evolution of the Theobalda family. First, we identify the family as a statistically relevant group in the space of synthetic proper elements. Using the hierarchical clustering method and the adopted cut-off velocity of dcut-off= 85 ms−1, we have found that the Theobalda family currently consists of 128 members. This family is located in the outer belt, near the proper semimajor axis ap≈ 3.175 au. This region is crossed by several three-body mean motion resonances, which give rise to significant chaotic zones. Consequently, the majority of family members reside on chaotic orbits. Using two independent methods, chaotic chronology and backward integration, we have found the Theobalda family to be only 6.9 ± 2.3 Myr old. We have also estimated that the family was likely produced by the cratering impact on a parent body of diameter DPB≈ 78 ± 9 km.

Keywords: methods: numerical; celestial mechanics; minor planets, asteroids: general

Journal Article.  8539 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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