A Uranian Trojan and the frequency of temporary giant-planet co-orbitals

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DOIResolve DOI: http://doi.org/10.1126/science.1238072
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TypeArticle
Journal titleScience
ISSN0036-8075
Volume341
Issue6149
Pages994997; # of pages: 4
Subjectdatabase; Neptune; numerical model; planetary surface; Uranus; article; astronomy; cosmological phenomena; data base; priority journal; quantitative study
AbstractTrojan 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.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number21270664
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Record identifier2cb58b7c-f88d-42ce-a83c-a5a7d5bf1eaf
Record created2014-02-17
Record modified2016-05-09
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