astro.wikisort.org - Asteroid

(471325) 2011 KT₁₉ (nicknamed Niku; /niːkuː/) is a trans-Neptunian object that has an unusual 110° tilted solar orbital plane and retrograde orbit around the Sun.[2][7][8]

(471325) 2011 KT₁₉

Discovery[1]
Discovered by	Mount Lemmon Srvy. List Ying-Tung Chen Hsing Wen Lin Matthew J. Holman Matthew J. Payne Wesley C. Fraser Pedro Lacerda Wing-Huen Ip Wen-Ping Chen Rolf-Peter Kudritzki Robert Jedicke Richard J. Wainscoat John L. Tonry Eugene A. Magnier Christopher Waters Nick Kaiser Shiang-Yu Wang Matthew Lehner
Discovery site	Mount Lemmon Obs.
Discovery date	31 May 2011
Designations
Pronunciation	/ˈniːkuː/
Named after	A Chinese adjective meaning "rebellious" [2]
Minor planet category	TNO[3] · centaur[4] damocloid
Orbital characteristics[3]
Epoch JD 2457600.5
Uncertainty parameter 2
Observation arc	1779 days (4.87 yr)
Aphelion	47.427 AU
Perihelion	23.7805 AU
Semi-major axis	35.604 AU
Eccentricity	0.33208
Orbital period (sidereal)	212.45 years
Mean anomaly	29.487°
Inclination	110.1537°
Longitude of ascending node	243.77772°
Argument of perihelion	322.174°
TJupiter	−1.552
Physical characteristics
Mean diameter	75–250 km[5] 161 km[4]
Apparent magnitude	22[6]
Absolute magnitude (H)	7.2[5][3]

While the object has not received a formal name, it received the moniker "Niku" (逆骨), meaning "rebellious" in the Chinese language, by its discoverers.[9][10]

Details

(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.[1][7] 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.[11] 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.[12]

The orbital characteristics of 2011 KT₁₉ have been compared to those of 2008 KV42 (Drac). The orbits of 2011 KT₁₉, 2008 KV₄₂, 2002 XU93, 2010 WG9, 2007 BP102, 2011 MM4, 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.[7]

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.

References

External links

• (471325) 2011 KT19 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (471325) 2011 KT19

(471325) 2011 KT19 ist ein Planetoid, der am 31. Mai 2011 im Rahmen der Mount Lemmon Survey entdeckt wurde und zur Gruppe der Transneptunischen Objekte gehört. Der Asteroid läuft auf einer mäßig exzentrischen Bahn in über 212 Jahren um die Sonne. Die Bahnexzentrizität seiner Bahn beträgt 0,33, wobei diese 110,15° gegen die Ekliptik geneigt ist, so dass er eine retrograde Umlaufbahn aufweist.

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- [en] (471325) 2011 KT19

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[ru] (471325) 2011 KT19

(471325) 2011 KT19 — транснептуновый объект с очень большим наклонением и ретроградным движением. Был открыт 31 мая 2011 года, но затем потерян. Переоткрыт в августе 2016 года группой астрономов с помощью телескопа Pan-STARRS, расположенного на вершине вулкана Мауна-Кеа на острове Гавайи[3][4].

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