# A Dwarf Planet Class Object in the 21:5 Resonance with Neptune

@article{Holman2018ADP,
title={A Dwarf Planet Class Object in the 21:5 Resonance with Neptune},
author={M. Holman and M. Payne and W. Fraser and P. Lacerda and M. Bannister and M. Lackner and Ying-Tung Chen and Hsing-Wen Lin and Kenneth W. Smith and Rositako Kotanekova and D. Young and K. Chambers and S. Chastel and L. Denneau and A. Fitzsimmons and H. Flewelling and T. Grav and M. Huber and Nick Induni and R. Kudritzki and A. Krolewski and R. Jedicke and N. Kaiser and E. Lilly and E. Magnier and Z. Mark and K. Meech and M.micheli and D. Murray and A. Parker and P. Protopapas and D. Ragozzine and P. Veres and R. Wainscoat and C. Waters and R. Weryk},
journal={The Astrophysical Journal},
year={2018},
volume={855}
}
We report the discovery of a $H_r = 3.4\pm0.1$ dwarf planet candidate by the Pan-STARRS Outer Solar System Survey. 2010 JO$_{179}$ is red with $(g-r)=0.88 \pm 0.21$, 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--2016 provide an exceptionally well-determined orbit for 2010 JO$_{179}$, with a semi-major axis of $78.307\pm0.009$ au, distant orbits known to this precision are rare… Expand

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