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Title: Discovery and physical characterization of a large scattered disk object at 92 au

We report the observation and physical characterization of the possible dwarf planet 2014 UZ$$_{224}$$ ("DeeDee"), a dynamically detached trans-Neptunian object discovered at 92 AU. This object is currently the second-most distant known trans-Neptunian object with reported orbital elements, surpassed in distance only by the dwarf planet Eris. The object was discovered with an $r$-band magnitude of 23.0 in data collected by the Dark Energy Survey between 2014 and 2016. Its 1140-year orbit has $$(a,e,i) = (109~\mathrm{AU},2 0.54, 26.8^{\circ})$$. It will reach its perihelion distance of 38 AU in the year 2142. Integrations of its orbit show it to be dynamically stable on Gyr timescales, with only weak interactions with Neptune. We have performed followup observations with ALMA, using 3 hours of on-source integration time to measure the object's thermal emission in the Rayleigh-Jeans tail. As a result, the signal is detected at 7$$\sigma$$ significance, from which we determine a $V$-band albedo of $$18.0^{+4.0}_{-2.9}\mathrm{(stat)}^{+1.5}_{-1.2}\mathrm{(sys)}$$ percent and a diameter of $$541^{+47}_{-51}\mathrm{(stat)}^{+19}_{-20}\mathrm{(sys)}$$~km, assuming a spherical body with uniform surface properties.
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Publication Date:
Report Number(s):
arXiv:1702.00731; FERMILAB-PUB-17-027-AE; DES-2016-0198
Journal ID: ISSN 2041-8213; 1515437; TRN: US1700543
Grant/Contract Number:
AC02-07CH11359; AC05-00OR22725; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 839; Journal Issue: 1; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
DES Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; infrared: planetary systems; Kuiper belt: general; methods: observational; techniques: photometric
OSTI Identifier:
1346353
Alternate Identifier(s):
OSTI ID: 1352812; OSTI ID: 1360906