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OSSOS. IV. Discovery of a Dwarf Planet Candidate in the 9:2 Resonance with NeptuneWe 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 approximately 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) identied 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.
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Reprint (Version printed in journal)
Bannister, Michele T. (Victoria Univ. Victoria, British Columbia, Canada)
Alexandersen, Mike (Academia Sinica Taipei, Taiwan, Province of China)
Benecchi, Susan (Planetary Science Inst. Tucson, AZ, United States)
Chen, Ying-Tung (Academia Sinica Taipei, Taiwan, Province of China)
Delsanti, Audrey (Aix-Marseille Univ. Marseille, France)
Fraser, Wesley C. (Queens Univ. Belfast, United Kingdom)
Gladman, Brett (British Columbia Univ. Vancouver, British Columbia, Canada)
Granvik, Mikael (Helsinki Univ. Helsinki, Finland)
Grundy, Will M. (Lowell Observatory Flagstaff, AZ, United States)
Guilbert-Lepoutre, Aurelie (Bourgogne Univ. France)
Gwyn, Stephen D. (National Research Council of Canada Vancouver, British Columbia, Canada)
Ip, Wing-Huen (Central Univ. Taiwan)
Jakubik, Marian (Slovak Academy of Sciences Tatranska Lomnica, Slovakia)
Jones, R. Lynne (Washington Univ. Washington, DC, United States)
Kaib, Nathan (Oklahoma Univ. Norman, OK, United States)
Kavelaars, J. J. (Victoria Univ. Victoria, British Columbia, Canada)
Lacerda, Pedro (Queens Univ. Belfast, United Kingdom)
Lawler, Samantha (National Research Council of Canada Vancouver, British Columbia, Canada)
Lehner, Matthew J. (Academia Sinica Taipei, Taiwan, Province of China)
Wen Hsing, Lin (Central Univ. Taiwan)
Lykawka, Patryk Sofia (Kindai Univ. Osaka, Japan)
Marsset, Michael (Aix-Marseille Univ. Marseille, France)
Murray-Clay, Ruth (California Univ. Santa Barbara, CA, United States)
Noll, Keith S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Parker, Alex (Southwest Research Inst. Boulder, CO, United States)
Petit, Jean-Marc (Bourgogne Univ. France)
Pike, Rosemary E. (Victoria Univ. Victoria, British Columbia, Canada)
Rousselot, Philippe (Bourgogne Univ. France)
Schwamb, Megan E. (Gemini Observatory Hilo, HI, United States)
Shankman, Cory (Victoria Univ. Victoria, British Columbia, Canada)
Veres, Peter (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Vernazza, Pierre (Aix-Marseille Univ. Marseille, France)
Volk, Kathryn (Arizona Univ. Tucson, AZ, United States)
Wang, Shiang-Yu (Academia Sinica Taipei, Taiwan, Province of China)
Weryk, Robert (Hawaii Univ. Honolulu, HI, United States)
Date Acquired
July 3, 2017
Publication Date
December 5, 2016
Publication Information
Publication: The Astronomical Journal
Volume: 152
Issue: 6
ISSN: 0004-6256
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