2015 KE172

Trans-Neptunian object April 2018 yes 2015 KE 172 #C2E0FF Orbit of 2015 KE 172 OSSOS Mauna Kea Obs. 21 May 2015(first observed only) 2015 KE 172 o5m72 (internal designation) TNO1:9distant 23 March 2018 (JD 2458200.5) 4 3.26 yr (1,189 d) 30 May 2014 222.11 AU Tm on 44.137 AU Tm on 133.12 AU Tm on 0.6685 1536 yr (561,018 d) 0.1061° 0.0006 ms / day 38.280° 227.55° 15.428° 100 km (est. at 0.09) 0.09 (generic est.) 8.2024 2015 KE 172 is a distant resonant trans-Neptunian object on an eccentric orbit in the outermost region of the Solar System, approximately 100 km mi off 1 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. It came to perihelion (closest approach to the Sun) in October 2017 at a distance of 44.1 AU e9km unit on. Its existence was first released in February 2018, and the observations and orbit were announced on 27 April 2018. It belongs to the most distant resonant objects known to exist. Description thumb|left|Orbital diagram of 2015 KE 172 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. The other object is 2007 TC 434 which was announced on 20 February 2018.Orbit Fit and Astrometric record for 07TC434 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. It is thought that both objects originated from the scattered disc before they became locked into a mean-motion resonance with Neptune. Based on a generic magnitude-to-diameter conversion, the object measures 100 kilometers in diameter, 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 2025, this minor planet has not been numbered. References 30em 2017-08-31 last obs. JPL Small-Body Database Browser: (2015 KE172) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3819579 Jet Propulsion Laboratory 28 April 2018 2015 KE172 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2015+KE172 28 April 2018 2007 TC434 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2007+TC434 28 April 2018 6 Kathryn Volk Ruth A. Murray-Clay Brett J. Gladman Samantha M. Lawler Tze Yeung Mathew Yu Mike Alexandersen Michele T. Bannister Ying-Tung Chen Rebekah I. Dawson Sarah Greenstreet Stephen D. J. Gwyn J. J. Kavelaars Hsing Wen Lin Patryk Sofia Lykawka Jean-Marc Petit OSSOS IX: two objects in Neptune's 9:1 resonance – implications for resonance sticking in the scattering population The Astronomical Journal 155 6 260 2018AJ....155..260V 1802.05805 10.3847/1538-3881/aac268 2018 119406588 free Asteroid Size Estimator CNEOS NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 28 April 2018 MPEC 2018-H97 : 2015 KE172 IAU Minor Planet Center 27 April 2018 https://minorplanetcenter.net/mpec/K18/K18H97.html 28 April 2018 (K15KH2E) MPEC 2018-D29 : 2007 TC434 IAU Minor Planet Center 20 February 2018 https://minorplanetcenter.net/mpec/K18/K18D29.html 28 April 2018 (K07Th4C) External links List Of Centaurs and Scattered-Disk Objects, Minor Planet Center List of Transneptunian Objects, Minor Planet Center How many dwarf planets are there in the outer solar system?, Michael Brown List of Known Trans-Neptunian Objects, Johnston's Archive 3819579 Category:Trans-Neptunian objects in a 1:9 resonance Category:Minor planet object articles (unnumbered) Category:Discoveries by OSSOS 20150521