2013 UH15

Extreme trans-Neptunian object October 2018 yes 2013 UH 15 #C2E0FF (first observed only)Las Campanas Obs. Las Campanas Obs. 29 October 2013 2013 UH 15 TNOESDOdistantETNO 27 April 2019 (JD 2458600.5) 5 1.96 yr (717 d) 305.39 AU 35.018 AU 170.20 AU 0.7943 2221 yr (811,042 d) 353.91° 0.0004 ms / day 26.090° 176.55° 282.97° 12.9 AU 128 km (est.)130 km (est.) 0.08 (assumed)0.09 (assumed) 7.7 2013 UH 15 is an extreme trans-Neptunian object from the extended scattered disc in the outermost region of the Solar System, approximately 130 km mi off 2 us in diameter. It was first observed on 29 October 2013, by astronomers at the Las Campanas Observatory in the southern Atacama Desert of Chile. The detached extended scattered disc object (ESDO) is on a highly eccentric orbit and belongs to the extreme trans-Neptunian objects. Orbit and classification 2013 UH 15 orbits the Sun at a distance of 35.0–305 AU once every 2221 years (811,042 days; semi-major axis of 170.2 AU). Its orbit has an exceptionally high eccentricity of 0.79 and an inclination of 26° with respect to the ecliptic. The body's observation arc begins with its official first observation at Las Campanas in October 2013. It has a minimum orbital intersection distance with Neptune of 12.9 AU. It belongs to a small group of detached objects with perihelion distances of 30 AU or more, and semi-major axes of 150 AU or more. These extreme trans-Neptunian objects (ETNOs) can not reach such orbits without some perturbing object, which leads to the speculation of Planet Nine. Numbering and naming As of 2025, this minor planet has neither been numbered nor named by the Minor Planet Center. The official discoverers will be defined when the object is numbered. Physical characteristics According to Johnston's Archive and to American astronomer Michael Brown, 2013 UH 15 measures 128 and 130 kilometers in diameter based on an assumed albedo of 0.09 and 0.08, respectively. Due to its small size, it is listed as "probably not" a dwarf planet (100–200 km) on Michael Brown's website, which uses a 5-class taxonomic system that ranges from "nearly certainly" to "possibly" for potential dwarf planet candidates. As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. See also List of unnumbered trans-Neptunian objects 2013 UH15 References 30em 2015-10-16 last obs. JPL Small-Body Database Browser: (2013 UH15) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3757871 Jet Propulsion Laboratory 26 October 2018 2013 UH15 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2013+UH15 26 October 2018 List Of Centaurs and Scattered-Disk Objects Minor Planet Center https://www.minorplanetcenter.net/iau/lists/t_centaurs.html 25 October 2018 Database Query: objects q>30, a>150 Minor Planet Center http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=30&semimajor_axis_min=150 25 October 2018 List of Known Trans-Neptunian Objects Johnston's Archive 7 October 2018 https://www.johnstonsarchive.net/astro/tnoslist.html 25 October 2018 How many dwarf planets are there in the outer solar system? California Institute of Technology Brown Michael E. https://web.gps.caltech.edu/~mbrown/dps.html 25 October 2018 2013 UH15 26 October 2018 External links List Of Centaurs and Scattered-Disk Objects, Minor Planet Center 2013UH15 3757871 # # Category:Minor planet object articles (unnumbered) 20131029