(471325) 2011 KT19
|Discovered by||Mount Lemmon Srvy.|
|Discovery site||Mount Lemmon Obs.|
|Discovery date||31 May 2011|
|A Chinese adjective meaning "rebellious" |
|Epoch JD 2457600.5|
|Uncertainty parameter 2|
|Observation arc||1779 days (4.87 yr)|
(471325) 2011 KT19 was discovered by the Mount Lemmon Survey on 31 May 2011. Its rediscovery was announced in August 2016 by a team of astronomers using the Pan-STARRS telescope. It was soon linked with a supposed prograde centaur (2011 KT19; inclination = 38° and semi-major axis = 28 AU) that had been lost due to a short observation arc. 2011 KT19 is in a 7:9 resonance with Neptune. Currently it is the only object with a nearly polar orbit that is in resonance with a planet. Notably, it is part of a group of objects that orbit the Sun in a highly inclined orbit; the reasons for this unusual orbit are unknown as of August 2016.
The orbital characteristics of 2011 KT19 have been compared to those of 2008 KV42 (Drac). The orbits of 2011 KT19, 2008 KV42, and four other objects appear to occupy a common plane, with three in prograde and three in retrograde orbits. The probability of this alignment occurring by chance is 0.016%. These orbits should leave a common plane in a few million years because the precession of prograde and retrograde orbits are in opposite directions. Simulations including the hypothetical Planet Nine did not maintain a common orbital plane and the plane does not coincide with the plane of the predicted high-inclination large semi-major axis objects of that model. Other simulations with a few Earth-mass dwarf planet on a high-inclination orbit also failed to reproduce the alignment.
|The orbit of 2011 KT19 in relation to Pluto and the planets of the Solar System|
|The orbit of Niku (purple), is shown with another steep retrograde TNO, Drac (yellow), and the other planets. Pluto's orbit is in red.|
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- Chen, Ying-Tung; Lin, Hsing Wen; Holman, Matthew J; Payne, Matthew J; et al. (5 August 2016). "Discovery of A New Retrograde Trans-Neptunian Object: Hint of A Common Orbital Plane for Low Semi-Major Axis, High Inclination TNOs and Centaurs". The Astrophysical Journal. 827: L24. arXiv:1608.01808. Bibcode:2016ApJ...827L..24C. doi:10.3847/2041-8205/827/2/L24.
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- Morais, M. H. M.; Nomouni, F. (2017). "First transneptunian object in polar resonance with Neptune". Letters. Monthly Notices of the Royal Astronomical Society. arXiv:1708.00346. Bibcode:2017MNRAS.472L...1M. doi:10.1093/mnrasl/slx125.
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