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Article Dans Une Revue Science Année : 2013

A Uranian Trojan and the Frequency of Temporary Giant-Planet Co-Orbitals

Résumé

Trojan objects share a planet’s orbit, never straying far from the triangular Lagrangian points, 60° ahead of (L4) or behind (L5) the planet. We report the detection of a Uranian Trojan; in our numerical integrations, 2011 QF99 oscillates around the Uranian L4 Lagrange point for >70,000 years and remains co-orbital for ∼1 million years before becoming a Centaur. We constructed a Centaur model, supplied from the transneptunian region, to estimate temporary co-orbital capture frequency and duration (to a factor of 2 accuracy), finding that at any time 0.4 and 2.8% of the population will be Uranian and Neptunian co-orbitals, respectively. The co-orbital fraction (∼2.4%) among Centaurs in the International Astronomical Union Minor Planet Centre database is thus as expected under transneptunian supply.

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Dates et versions

hal-01108906 , version 1 (23-01-2015)

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Mike Alexandersen, Brett Gladman, Sarah Greenstreet, J. J. Kavelaars, Jean-Marc C. Petit, et al.. A Uranian Trojan and the Frequency of Temporary Giant-Planet Co-Orbitals. Science, 2013, 341 (6149), pp.994-997. ⟨10.1126/science.1238072⟩. ⟨hal-01108906⟩
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