2008 LC18

Neptune trojan January 2022 yes 2008 LC 18 #C7FF8F 7 June 2008 S. S. Sheppard C. Trujillo Mauna Kea Obs. 2008 LC 18 Neptune trojan centaur distant 21 November 2025 (JD 2461000.5) 4 15.75 yr (5,753 days) 32.448 AU 27.326 AU 29.887 AU 0.0857 163.39 yr (59,679 days) 204.47° 0.0060 ms / day 27.595° 88.581° 5.8080° 98 km (est. at 0.10) 100 km 23.2 8.21 2008 LC 18 is a Neptune trojan first observed on 7 June 2008 by American astronomers Scott Sheppard and Chad Trujillo using the Subaru Telescope at Mauna Kea Observatories on Hawaii, United States. It was the first object found in Neptune's trailing Lagrangian point and measures approximately 100 kilometers in diameter. Orbit and classification Neptune trojans are resonant trans-Neptunian objects in a 1:1 mean-motion orbital resonance with Neptune. These trojans have a semi-major axis and an orbital period very similar to Neptune's (30.10 AU; 164.8 years). 2008 LC 18 belongs to the trailing group, which follow 60° behind Neptune's orbit. It orbits the Sun with a semi-major axis of 29.887 AU at a distance of 27.3–32.4 AU once every 163 years and 5 months (59,679 days). Its orbit has an eccentricity of 0.09 and an inclination of 27.6° with respect to the ecliptic. This object has the second highest inclination of any known Neptune trojan after 2011 HM 102, which has 29.3°. Search for Neptune trojans The search for yes trojans of Neptune has been impeded by the fact that this region of space is currently along the line of sight to the center of the Milky Way, an area of the sky crowded with stars. 2008 LC 18 was found in a location where background stars are obscured by a dust cloud. The discovery of one Neptune yes trojan in a searched area of 19 square degrees suggests that there may be 150 Neptune yes trojans with a diameter greater than ~80 km (24th magnitude), similar to the estimate of such objects in Neptune's swarm. New Horizons probe 2008 LC 18 was not close enough for investigation by the New Horizons spacecraft when it crossed Neptune's region en route to Pluto in 2013–2014, but its discovery showed that other, more accessible Neptune trojans could potentially have been found before that time. 2008 LC 18 was 2 AU from Pluto in 1997.2008 LC18 at JPL Horizons Change "Observer Location" to @Pluto 2008 LC 18 crossed the ecliptic plane in 2011. 2016, it is 33 AU from Neptune. Physical characteristics The discoverers estimate that the body has a mean-diameter of 100 kilometers based on a magnitude of 23.2. Based on a generic magnitude-to-diameter conversion, it measures approximately 98 kilometers in diameter using an absolute magnitude of 8.2 with an assumed albedo of 0.10. Numbering and naming Due to its orbital uncertainty, this minor planet has not been numbered and its official discoverers have not been determined. If named, it will follow the naming scheme already established with 385571 Otrera, which is to name these objects after figures related to the Amazons, an all-female warrior tribe that fought in the Trojan War on the side of the Trojans against the Greek.https://www.iau.org/static/science/scientific_bodies/working_groups/97/wg-sbn-triennial-report-2015-2018.pdf DIVISION F / Working Group for Small Body Nomenclature Working Group for Small Body Nomenclature. THE TRIENNIAL REPORT (2015 Sept 1 – 2018 Feb 15) 10 April 2018 25 August 2018 IAU Ticha, J. etal 25 August 2018 https://web.archive.org/web/20180825143250/https://www.iau.org/static/science/scientific_bodies/working_groups/97/wg-sbn-triennial-report-2015-2018.pdf dead References 30em 2024-03-08 last obs. JPL Small-Body Database Browser: (2008 LC18) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3544362 Jet Propulsion Laboratory 4 August 2017 2008 LC18 Minor Planet Center http://www.minorplanetcenter.net/db_search/show_object?object_id=2008+LC18 4 August 2017 List of Neptune Trojans Minor Planet Center 10 July 2017 http://www.minorplanetcenter.org/iau/lists/NeptuneTrojans.html 4 August 2017 Asteroid Size Estimator CNEOS/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 4 August 2017 Scott S. Sheppard Chadwick A. Trujillo September 2010 Detection of a Trailing (L5) Neptune Trojan Science 329 5997 1304 2010Sci...329.1304S 10.1126/science.1189666 20705814 7657932 free 2010-10-18 Reaching the Mid-Mission Milestone on the Way to Pluto! New Horizons : The PI's Perspective http://www.spaceref.com/news/viewsr.html?pid=35138 2019-04-09September 2024 InternetArchiveBot yes Lakdawalla Emily 2008 LC15, the first Trojan asteroid discovered in Neptune's L5 point 13 August 2010 The Planetary Society http://www.planetary.org/blogs/emily-lakdawalla/2010/2623.html 4 August 2017 External links AstDys-2 about 2008 LC 18 u4oeJ34FkLQ Scott Sheppard and the hunt for Neptune Trojans (time 1:40 min.) 2008LC18 3544362 # Category:Minor planet object articles (unnumbered) # # # 20080607