Abstract
We report the discovery of an H r = 3.4 ± 0.1 dwarf planet candidate by the Pan-STARRS Outer Solar System Survey. 2010 JO179 is red with (g − r) = 0.88 ± 0.21, roughly round, and slowly rotating, with a period of 30.6 hr. Estimates of its albedo imply a diameter of 600–900 km. Observations sampling the span between 2005 and 2016 provide an exceptionally well determined orbit for 2010 JO179, with a semimajor axis of 78.307 ± 0.009 au; distant orbits known to this precision are rare. We find that 2010 JO179 librates securely within the 21:5 mean-motion resonance with Neptune on 100 Myr timescales, joining the small but growing set of known distant dwarf planets on metastable resonant orbits. These imply a substantial trans-Neptunian population that shifts between stability in high-order resonances, the detached population, and the eroding population of the scattering disk.
| Original language | English |
|---|---|
| Article number | L6 |
| Number of pages | 9 |
| Journal | Astrophysical Journal Letters |
| Volume | 855 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 28 Feb 2018 |
Keywords
- Kuiper belt objects: individual (2010 JO)
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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