| 词条 | 2011 QF99 |
| 释义 |
| minorplanet = yes | background = #C7FF8F | name = {{mp|2011 QF|99}} | discoverer = | discovery_site = Mauna Kea Obs. | discovered = 29 August 2011 {{small|(first observation only)}} | mpc_name = {{mp|2011 QF|99}} | alt_names = | mp_category = Uranus trojan [2] centaur {{·}}distant [4] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 3 | observation_arc = 3.97 yr (1,449 days) | aphelion = 22.422 AU | perihelion = 15.659 AU | semimajor = 19.040 AU | eccentricity = 0.1776 | period = 83.08 yr (30,346 days) | mean_anomaly = 283.84° | mean_motion = {{Deg2DMS|0.0119|sup=ms}} / day | inclination = 10.833° | asc_node = 222.52° | arg_peri = 288.25° | dimensions = 60 km {{small|(calculated)}}[2] | albedo = 0.05 {{small|(assumed)}}[2] | mass = | density = | abs_magnitude = 9.6 {{small|(R-band)}}[2] 9.7 }} Asteroid {{mp|2011 QF|99}} is a minor planet from the outer Solar System and the first known Uranus trojan to be discovered. It measures approximately 60 kilometers in diameter, assuming an albedo of 0.05.[2][11] It was first observed 29 August 2011 during a deep survey of trans-Neptunian objects conducted with the Canada–France–Hawaii Telescope, but its identification as Uranian trojan was not announced until 2013.[2][13] {{mp|2011 QF|99}} temporarily orbits near Uranus's {{L4}} Lagrangian point (leading Uranus). It will continue to librate around {{L4|nolink=yes}} for at least 70,000 years and will remain a Uranus co-orbital for up to three million years before becoming a centaur. {{mp|2011 QF|99}} is thus a temporary Uranus trojan—a centaur captured some time ago.[2][15]Uranus trojans are generally expected to be unstable and none of them are thought to be of primordial origin. A simulation led to the conclusion that at any given time, 0.4% of the centaurs in the scattered population within 34 AU would be Uranus co-orbitals, of which 64% (0.256% of all centaurs) would be in horseshoe orbits, 10% (0.04%) would be quasi-satellites, and 26% (0.104%) would be trojans (evenly split between the {{L4|nolink=yes}} and {{L5|nolink=yes}} groups).[2] A second Uranian Trojan, {{mpl|2014 YX|49}}, was announced in 2017.[17] References1. ^1 {{cite web |title = 2011 QF99 |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2011+QF99 |accessdate = 12 October 2017}} [1][2][3][4][5][6]2. ^1 2 3 4 5 6 7 8 {{Cite journal | last1 = Alexandersen | first1 = M. | last2 = Gladman | first2 = B. | last3 = Greenstreet | first3 = S. | last4 = Kavelaars | first4 = J. J. | last5 = Petit | first5 = J. -M. | last6 = Gwyn | first6 = S. | doi = 10.1126/science.1238072 | title = A Uranian Trojan and the Frequency of Temporary Giant-Planet Co-Orbitals | journal = Science | volume = 341 | issue = 6149 | pages = 994–997 | date = 2013 | pmid = 23990557| pmc = | arxiv = 1303.5774|bibcode = 2013Sci...341..994A |url= https://arxiv.org/pdf/1303.5774.pdf}} 3. ^1 {{cite web | last = Choi | first = C. Q. | title = First 'Trojan' Asteroid Companion of Uranus Found | work = Space.com web site | publisher = TechMediaNetwork | date = 2013-08-29 | url = http://www.space.com/22590-uranus-trojan-asteroid-discovery.html | accessdate = 2013-09-03}} 4. ^1 {{cite journal|last=Alexandersen|first=M.|last2=Kavelaars|first2=J.|last3=Petit|first3=J.|last4=Gladman|first4=B.|title=MPEC 2013-F19: 2011 QF99|date=18 March 2013|url=http://www.minorplanetcenter.net/mpec/K13/K13F19.html|publisher=IAU|accessdate=3 September 2013}} 5. ^1 {{cite journal |last2=de la Fuente Marcos |first2=Raúl |last1=de la Fuente Marcos |first1=Carlos |title=Comparative orbital evolution of transient Uranian co-orbitals: exploring the role of ephemeral multibody mean motion resonances |journal=Monthly Notices of the Royal Astronomical Society |date= 22 May 2014 |volume=441 |issue=3 |arxiv=1404.2898 |doi=10.1093/mnras/stu733 |pages=2280–2295 |bibcode = 2014MNRAS.441.2280D }} 6. ^1 {{cite journal |last2=de la Fuente Marcos |first2=Raúl |last1=de la Fuente Marcos |first1=Carlos |title=Asteroid 2014 YX49: a large transient Trojan of Uranus |journal=Monthly Notices of the Royal Astronomical Society |date= 15 May 2017 |volume=467 |issue=2 |arxiv=1701.05541 |doi=10.1093/mnras/stx197 |pages=1561–1568|bibcode=2017MNRAS.467.1561D }} }} External links
3 : Uranus trojans|Minor planet object articles (unnumbered)|Astronomical objects discovered in 2011 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。