Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-16
Astrophys.J.640:L83-L86,2006
Astronomy and Astrophysics
Astrophysics
3 figures, submitted to ApJL
Scientific paper
10.1086/503098
We report the discovery of the first trans-neptunian object, designated 2004 XR190, with a nearly-cirular orbit beyond the 2:1 mean-motion resonance. Fitting an orbit to 23 astrometric observations spread out over 12 months yields an orbit of a=57.2\pm0.4, e=0.08\pm0.04, and i=46.6 deg. All viable orbits have perihelia distances q>49 AU. The very high orbital inclination of this extended scattered disk object might be explained by several models, but its existence again points to a large as-yet undiscovered population of transneptunian objects with large orbital perihelia and inclination.
Allen Rhiannon Lynne
Gladman Brett
Kavelaars John J.
Nicholson Phil
Parker Joel William
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