OSSOS. IV. DISCOVERY of A DWARF PLANET CANDIDATE in the 9:2 RESONANCE with NEPTUNE

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题名:	OSSOS. IV. DISCOVERY of A DWARF PLANET CANDIDATE in the 9:2 RESONANCE with NEPTUNE
作者:	葉永烜;Lin, Hsing Wen;Aurélie, Guilbert-Lepoutre;Chen, Ying-Tung;Gladman, Brett;Grundy, William M.;Jakubik, Marian;Ip, Wing-Huen;Granvik, Mikael;Wang, Shiang-Yu;Schwamb, Megan E.;Lacerda, Pedro;Shankman, Cory;Volk, Kathryn;Lehner, Matthew J.;Weryk, Robert;Kavelaars, Jj;Jones, R. Lynne;Fraser, Wesley C.;Kaib, Nathan A.;Alexandersen, Mike;Parker, Alex;Benecchi, Susan D.;Marsset, Michael;Gwyn, Stephen D. J.;Petit, Jean-Marc;Pike, Rosemary E.;Vernazza, Pierre;Vereš, Peter;Bannister, Michele T.;Noll, Keith S.;Lykawka, Patryk Sofia;Lawler, Samantha;Delsanti, Audrey;Rousselot, Philippe;Ruth, Murray-Clay
贡献者:	理學院天文研究所
关键词:	[PHYS.ASTR.EP] Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP];[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph];Astronomy and Astrophysics;Astronomy, Space science;Astrophysics - Earth and Planetary Astrophysics;dk/atira/pure/subjectarea/asjc/1900/1912;dk/atira/pure/subjectarea/asjc/1900/1912;name=Space and Planetary Science;dk/atira/pure/subjectarea/asjc/3100/3103;dk/atira/pure/subjectarea/asjc/3100/3103;name=Astronomy and Astrophysics;DYNAMICAL INSTABILITY;Earth and Planetary Astrophysics (astro-ph.EP);FOS: Physical sciences;individual (2015 RR245) [Kuiper belt objects];Kuiper belt objects: individual (2015 RR245);KUIPER-BELT OBJECTS;OORT CLOUD;ORIGIN;OUTER SOLAR-SYSTEM;POPULATION;RADIUS;SCATTERED DISK;SIZE DISTRIBUTION;SKY SURVEY;Space and Planetary Science
日期:	2016-12-01
上传时间:	2026-04-21 14:58:58 (UTC+8)
出版者:	IOP Publishing Ltd.;American Astronomical Society
摘要:	摘要： ABSTRACT 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 <jats:inline-formula> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ajaa4532ieqn1.gif" xlink:type="simple" /> </jats:inline-formula> and absolute magnitude <jats:inline-formula> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ajaa4532ieqn2.gif" xlink:type="simple" /> </jats:inline-formula> for an assumed albedo of p V = 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. 出版者： American Astronomical Society 出版日期： 2016-12-01 出處： The Astronomical Journal, 2016-12, Vol.152, p.212- 資源來源： Institute of Physics Journals 識別號： ISSN: 0004-6256 識別號： EISSN: 1538-3881 識別號： DOI: 10.48550/arxiv.1607.06970 識別號： DOI: 10.3847/0004-6256/152/6/212
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