| 词条 | (471325) 2011 KT19 | ||
| 释义 |
| minorplanet = yes | background = #C2E0FF | name = {{mp|471325|2011 KT|19}} | image = | image_size = | caption = | discovery_ref = [1] | discoverer = Mount Lemmon Srvy.
| discovery_site = Mount Lemmon Obs. | discovered = 31 May 2011 | mpc_name = | pronounced = {{IPAc-en|n|iː|k|uː}} | alt_names = | adjectives = | named_after = A Chinese adjective meaning "rebellious" [2] | mp_category = TNO | orbit_ref = | epoch = JD 2457600.5 | uncertainty = 2 | observation_arc = 1779 days (4.87 yr) | aphelion = 47.427 AU | perihelion = 23.7805 AU | semimajor = 35.604 AU | eccentricity = 0.33208 | period = 212.45 years | avg_speed = | inclination = 110.1537° | asc_node = 243.77772° | arg_peri = 322.174° | mean_anomaly = 29.487° | tisserand = −1.552 | satellites = | physical_characteristics = | sidereal_day = | dimensions = 75–250 km[5] | albedo = | single_temperature = | spectral_type = | abs_magnitude = 7.2[1] | magnitude = 22[2] }}{{mp|471325|2011 KT|19}} (nicknamed Niku; {{IPAc-en|n|iː|k|uː}}) is a trans-Neptunian object that has an unusual 110° tilted solar orbital plane and retrograde orbit around the Sun.[3][4][5] Details{{mp|471325|2011 KT|19}} 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 ({{mp|2011 KT|19}}; inclination = 38° and semi-major axis = 28 AU) that had been lost due to a short observation arc.[1][4] {{mp|2011 KT|19}} 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.[6] 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.[7]The orbital characteristics of {{mp|2011 KT|19}} have been compared to those of {{mpl|2008 KV|42}} (Drac). The orbits of {{mp|2011 KT|19}}, {{mp|2008 KV|42}}, 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.[4]
References1. ^1 {{cite web |title=IAU Minor Planet Center - 2011 KT19 |url=http://www.minorplanetcenter.net/db_search/show_object?object_id=2011+KT19 |website=Minor Planet Center |publisher=IAU |accessdate=12 August 2016}} [8]2. ^{{cite web |title=AstDyS (471325) 2011KT19 Ephemerides |url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=2011KT19 |accessdate=18 February 2017}} 3. ^1 {{cite web |url=https://web.archive.org/web/20160811163627if_/https://www.newscientist.com/article/2100700-mystery-object-in-weird-orbit-beyond-neptune-cannot-be-explained/ |work=New Scientist |title=Mystery object in weird orbit beyond Neptune cannot be explained |date=10 August 2016 |accessdate=11 August 2016}} 4. ^1 2 {{cite journal |first1=Ying-Tung |last1=Chen |first2=Hsing Wen |last2=Lin |first3=Matthew J |last3=Holman |first4=Matthew J |last4=Payne |first5=Wesley C |last5=Fraser |first6=Pedro |last6=Lacerda |first7=Wing-Huen |last7=Ip |first8=Wen-Ping |last8=Chen |first9=Rolf-Peter |last9=Kudritzki |first10=Robert |last10=Jedicke |first11=Richard J |last11=Wainscoat |first12=John L |last12=Tonry |first13=Eugene A |last13=Magnier |first14=Christopher |last14=Waters |first15=Nick |last15=Kaiser |first16=Shiang-Yu |last16=Wang |first17=Matthew |last17=Lehner |arxiv=1608.01808 |title=Discovery of A New Retrograde Trans-Neptunian Object: Hint of A Common Orbital Plane for Low Semi-Major Axis, High Inclination TNOs and Centaurs |date=5 August 2016 |display-authors=4 |doi=10.3847/2041-8205/827/2/L24 |volume=827 |journal=The Astrophysical Journal |page=L24|bibcode = 2016ApJ...827L..24C }} 5. ^{{Cite web |url=http://www.sciencefriday.com/segments/what-makes-the-solar-system-like-a-crime-scene/ |title=What Makes the Solar System Like a Crime Scene? - Science Friday |last= |first= |date=19 August 2016 |website= |publisher= |language=en-US |access-date=19 August 2016}} 6. ^{{cite journal |last1=Morais |first1=M. H. M. |last2=Nomouni |first2=F. |title=First transneptunian object in polar resonance with Neptune |date=2017 |arxiv=1708.00346 |doi=10.1093/mnrasl/slx125 |journal=Monthly Notices of the Royal Astronomical Society |department=Letters |bibcode=2017MNRAS.472L...1M }} 7. ^{{cite web |first=Andrew |last=Dalton |url=https://www.engadget.com/2016/08/10/beyond-neptune-niku-discovery/ |title=There's something weird going on beyond Neptune |work=Engadget |publisher=AOL |date=10 August 2016 |accessdate=11 August 2016}} 8. ^1 2 {{cite web |title=MPEC 2011-L09 : 2011 KT19 |publisher=IAU Minor Planet Center |date=2 June 2011 |url=http://www.minorplanetcenter.net/iau/mpec/K11/K11L09.html}} (K11K19T; E-assumed due to short arc) }} External links
3 : Trans-Neptunian objects|Discoveries by MLS|Astronomical objects discovered in 2011 |
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