Ossos. Iv. discovery of a dwarf planet candidate in the 9:2 resonance with Neptune

Michele T. Bannister, Mike Alexandersen, Susan D. Benecchi, Ying-Tung Chen, Audrey Delsanti, Wesley C. Fraser, Brett J. Gladman, Mikael Granvik, Will M. Grundy, Aurélie Guilbert-Lepoutre, Stephen D J Gwyn, Wing-Huen Ip, Marian Jakubik, R. Lynne Jones, Nathan Kaib, J. J. Kavelaars, Pedro Lacerda, Samantha Lawler, Matthew J. Lehner, Hsing Wen LinPatryk Sofia Lykawka, Michael Marsset, Ruth Murray-Clay, Keith S. Noll, Alex Parker, Jean Marc Petit, Rosemary E. Pike, Philippe Rousselot, Megan E. Schwamb, Cory Shankman, Peter Veres, Pierre Vernazza, Kathryn Volk, Shiang-Yu Wang, Robert Weryk

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11 Citations (Scopus)
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We report the discovery and orbit of a new dwarf planet candidate, 2015 RR245, by the Outer Solar System Origins Survey (OSSOS). The orbit of 2015 RR245 is eccentric (e = 0.586), with a semimajor axis near 82 au, yielding a perihelion distance of 34 au. 2015 RR245 has g - r = 0.59 ± 0.11 and absolute magnitude Hr = 3.6 ± 0.1; for an assumed albedo of pV = 12%, the object has a diameter of ∼670 km. Based on astrometric measurements from OSSOS and Pan-STARRS1, we find that 2015 RR245 is securely trapped on ten-megayear timescales in the 9:2 mean-motion resonance with Neptune. It is the first trans-Neptunian object (TNO) identified in this resonance. On hundred-megayear timescales, particles in 2015 RR245-like orbits depart and sometimes return to the resonance, indicating that 2015 RR245 likely forms part of the long-lived metastable population of distant TNOs that drift between resonance sticking and actively scattering via gravitational encounters with Neptune. The discovery of a 9:2 TNO stresses the role of resonances in the long-term evolution of objects in the scattering disk and reinforces the view that distant resonances are heavily populated in the current solar system. This object further motivates detailed modeling of the transient sticking population.

Original languageEnglish
Article number212
JournalAstronomical Journal
Issue number6
Publication statusPublished - 01 Dec 2016


  • Kuiper belt objects: individual (2015 RR245)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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