| 词条 | 2015 KE172 |
| 释义 |
| minorplanet = yes | name = {{mp|2015 KE|172}} | background = #C2E0FF | image = | image_size = | caption = Orbit of {{mp|2015 KE|172}} | discovery_ref = [1] | discoverer = OSSOS | discovery_site = Mauna Kea Obs. | discovered = 21 May 2015 {{small|(first observed only)}} | mpc_name = {{mp|2015 KE|172}} | alt_names = o5m72 | pronounced = | named_after = | mp_category = TNO {{·}}1:9 [3] distant [1] | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 4 | observation_arc = 3.26 yr (1,189 d) |earliest_precovery_date = 30 May 2014 | aphelion = 222.11 AU | perihelion = 44.137 AU | semimajor = 133.12 AU | eccentricity = 0.6685 | period = 1536 yr (561,018 d) | mean_anomaly = 0.1061° | mean_motion = {{Deg2DMS|0.0006|sup=ms}} / day | inclination = 38.280° | asc_node = 227.55° | arg_peri = 15.428° | mean_diameter = {{val|100|ul=km}} {{small|(est. at 0.09)}}[6] | rotation = | albedo = 0.09 {{small|(generic est.)}}[6] | spectral_type = | abs_magnitude = 8.2024 }}{{mp|2015 KE|172}}, internal designation o5m72, is a distant resonant trans-Neptunian object on an eccentric orbit in the outermost region of the Solar System, approximately {{convert|100|km|mi|abbr=off|sigfig=1|sp=us}} in diameter. It was first observed on 21 May 2015 by astronomers with the Outer Solar System Origins Survey at the Mauna Kea Observatories on the island of Hawaii, United States.[1] It came to perihelion (closest approach to the Sun) in October 2017 at a distance of {{Convert|44.1|AU|e9km|abbr=unit|lk=on}}. Its existence was first released in February 2018, and the observations and orbit were announced on 27 April 2018.[11] It belongs to the most distant resonant objects known to exist.[3] Description{{mp|2015 KE|172}} is one of two known resonant trans-Neptunian objects that stay in a distant 1:9 resonance with the ice giant Neptune.[3] The other object is {{mp|2007 TC|434}} which was announced on 20 February 2018.[3][15][16][1] They are currently the most distant resonant objects known with a secure resonant classification, and their detection allowed to estimate a 1:9-resonant population of 11 thousand objects with similar orbits and similar size.[3] It is thought that both objects originated from the scattered disc before they became locked into a mean-motion resonance with Neptune.[3]Based on a generic magnitude-to-diameter conversion, the object measures 100 kilometers in diameter,[6] for an absolute magnitude of 8.2, and an assumed albedo of 0.09, which is a typical figure seen among the diverse populations of distant objects. It orbits the Sun at a distance of 44.1–222 AU once every 1536 years (semi-major axis of 133.1 AU). Its orbit has a high eccentricity of 0.67 and an inclination of 38° with respect to the ecliptic. As of 2018, this minor planet has not been numbered.[1] References1. ^Orbit Fit and Astrometric record for 07TC434 [2][3][4][5][6][7]2. ^1 2 3 4 {{cite web |title = 2015 KE172 |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2015+KE172 |accessdate = 28 April 2018}} 3. ^1 {{cite web |title = 2007 TC434 |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2007+TC434 |accessdate = 28 April 2018}} 4. ^1 2 3 4 5 6 {{Cite journal |display-authors = 6 |first1 = Kathryn |last1 = Volk |first2 = Ruth A. |last2 = Murray-Clay |first3 = Brett J. |last3 = Gladman |first4 = Samantha M. |last4 = Lawler |first5 = Tze Yeung Mathew |last5 = Yu |first6 = Mike |last6 = Alexandersen |first7 = Michele T. |last7 = Bannister |first8 = Ying-Tung |last8 = Chen |first9 = Rebekah I. |last9 = Dawson |first10 = Sarah |last10 = Greenstreet |first11 = Stephen D. J. |last11 = Gwyn |first12 = J. J. |last12 = Kavelaars |first13 = Hsing Wen |last13 = Lin |first14 = Patryk Sofia |last14 = Lykawka |first15 = Jean-Marc |last15 = Petit |title = OSSOS IX: two objects in Neptune's 9:1 resonance -- implications for resonance sticking in the scattering population |journal = The Astronomical Journal |volume = 155 |issue = 6 |pages = 260 |bibcode = 2018AJ....155..260V |arxiv = 1802.05805 |doi= 10.3847/1538-3881/aac268|year = 2018 }} 5. ^1 2 3 {{cite web |title = Asteroid Size Estimator |publisher = CNEOS NASA/JPL |url = https://cneos.jpl.nasa.gov/tools/ast_size_est.html |access-date= 28 April 2018}} 6. ^1 {{cite web |title=MPEC 2018-H97 : 2015 KE172 |publisher=IAU Minor Planet Center |date=27 April 2018 |url=https://minorplanetcenter.net/mpec/K18/K18H97.html |accessdate=28 April 2018}} (K15KH2E) 7. ^1 {{cite web |title=MPEC 2018-D29 : 2007 TC434 |publisher=IAU Minor Planet Center |date=20 February 2018 |url=https://minorplanetcenter.net/mpec/K18/K18D29.html |accessdate=28 April 2018}} (K07Th4C) }} External links
4 : Resonant trans-Neptunian objects|Minor planet object articles (unnumbered)|Discoveries by OSSOS|Astronomical objects discovered in 2015 |
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