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Carretero, J. C. Becker, J. De Vicente, J. Frieman, J. Garcia-Bellido, J. Gschwend, J. L. Marshall, K. Franson, K. Honscheid, K. Kuehn, K. Napier, L. Markwardt, L. N. da Costa, L. Zullo, M. A. G. Maia, M. Carrasco Kind, M. E. C. Swanson, M. March, M. Sako, M. Smith, M. Soares-Santos, N. Kuropatkin, P. Bernardinelli, P. Doel, P. Fosalba, R. A. Gruendl, R. C. Smith, R. L. C. Ogando, R. Miquel, R. Schindler, S. Allam, S. Avila, S. J. Hamilton, S. Millholland, T. F. Eifler, T. Khain, V. Scarpine, W. G. Hartley, W. Wester","submitted_at":"2018-05-14T18:01:02Z","abstract_excerpt":"We report the discovery and dynamical analysis of 2015 BP$_{519}$, an extreme Trans-Neptunian Object detected detected by the Dark Energy Survey at a heliocentric distance of 55 AU and absolute magnitude Hr= 4.3. The current orbit, determined from a 1110-day observational arc, has semi-major axis $a\\approx$ 450 AU, eccentricity $e\\approx$ 0.92 and inclination $i\\approx$ 54 degrees. 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