OSSOS. IV. DISCOVERY OF A DWARF PLANET CANDIDATE IN THE 9 : 2 RESONANCE WITH NEPTUNE

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Bannister , M T , Alexandersen , M , Benecchi , S D , Chen , Y-T , Delsanti , A , Fraser , W C , Gladman , B J , Granvik , M , Grundy , W M , Guilbert-Lepoutre , A , Gwyn , S D J , Ip , W-H , Jakubik , M , Jones , R L , Kaib , N , Kavelaars , J J , Lacerda , P , Lawler , S , Lehner , M J , Lin , H W , Lykawka , P S , Marsset , M , Murray-Clay , R , Noll , K S , Parker , A , Petit , J-M , Pike , R E , Rousselot , P , Schwamb , M E , Shankman , C , Veres , P , Vernazza , P , Volk , K , Wang , S-Y & Weryk , R 2016 , ' OSSOS. IV. DISCOVERY OF A DWARF PLANET CANDIDATE IN THE 9 : 2 RESONANCE WITH NEPTUNE ' Astronomical Journal , vol. 152 , no. 6 , 212 . DOI: 10.3847/0004-6256/152/6/212

Title: OSSOS. IV. DISCOVERY OF A DWARF PLANET CANDIDATE IN THE 9 : 2 RESONANCE WITH NEPTUNE
Author: Bannister, Michele T.; Alexandersen, Mike; Benecchi, Susan D.; Chen, Ying-Tung; Delsanti, Audrey; Fraser, Wesley C.; Gladman, Brett J.; Granvik, Mikael; Grundy, Will M.; Guilbert-Lepoutre, Aurelie; Gwyn, Stephen D. J.; Ip, Wing-Huen; Jakubik, Marian; Jones, R. Lynne; Kaib, Nathan; Kavelaars, J. J.; Lacerda, Pedro; Lawler, Samantha; Lehner, Matthew J.; Lin, Hsing Wen; Lykawka, Patryk Sofia; Marsset, Michael; Murray-Clay, Ruth; Noll, Keith S.; Parker, Alex; Petit, Jean-Marc; Pike, Rosemary E.; Rousselot, Philippe; Schwamb, Megan E.; Shankman, Cory; Veres, Peter; Vernazza, Pierre; Volk, Kathryn; Wang, Shiang-Yu; Weryk, Robert
Contributor: University of Helsinki, Particle Physics and Astrophysics
Date: 2016-12
Language: eng
Number of pages: 8
Belongs to series: Astronomical Journal
ISSN: 0004-6256
URI: http://hdl.handle.net/10138/183641
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 g - r = 0.59 +/- 0.11 and absolute magnitude H-r = 3.6 +/- 0.1; for an assumed albedo of p(V) = 12%, the object has a diameter of similar to 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.
Subject: Kuiper belt objects: individual (2015 RR245)
KUIPER-BELT OBJECTS
OUTER SOLAR-SYSTEM
SCATTERED DISK
DYNAMICAL INSTABILITY
SIZE DISTRIBUTION
OORT CLOUD
SKY SURVEY
POPULATION
ORIGIN
RADIUS
115 Astronomy, Space science
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