2004 KV18

Neptune trojan February 2018 yes 2004 KV 18 #C2E0FF 24 May 2004 Mauna Kea Obs. 2004 KV 18 Neptune trojanTNOdistant 21 November 2025 (JD 2461000.5) 4 17.19 yr (6,277 days) 35.688 AU 24.488 AU 30.088 AU 0.1861 165.04 yr (60,281 days) 90.039° 0.0060 ms / day 13.607° 235.69° 293.85° 56 km (assumed)71 km (est. at 0.10) 8.74 2004 KV 18 is an eccentric Neptune trojan trailing Neptune's orbit in the outer Solar System, approximately 70 kilometers in diameter. It was first observed on 24 May 2004, by astronomers at the Mauna Kea Observatories on Hawaii, United States. It was the eighth Neptune trojan identified and the second in Neptune's Lagrangian point. Orbit and classification Neptune trojans are resonant trans-Neptunian objects (TNO) 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). 2004 KV 18 belongs to the trailing group, which follow 60° behind Neptune's orbit. It orbits the Sun with a semi-major axis of 30.088 AU at a distance of 24.5–35.7 AU once every 165 years and 0.5 months (60,281 days). Its orbit has a notably high eccentricity of 0.19 and an inclination of 14° with respect to the ecliptic. Orbital instability 2004 KV 18 is not a primordial Neptune trojan, and will leave the region on a relatively short time scale. The orbit of a Neptune trojan can only be stable when the eccentricity is less than 0.12.6 Its lifetime as a trailing Neptune trojan is on the order of 100,000 years into the future. Physical properties Diameter and albedo Based on a generic magnitude-to-diameter conversion, it measures approximately 71 kilometers in diameter using an absolute magnitude of 8.9 and an assumed albedo of 0.10. It is one of the smaller bodies among the first 17 Neptune trojans discovered so far, which measure between 60 and 200 kilometers (for an absolute magnitude of 9.3–6.6 and an assumed albedo of 0.10). Other estimates, implying a higher albedo than 0.10, gave a diameter of approximately 56 kilometers. 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 2021-07-31 last obs. JPL Small-Body Database Browser: (2004 KV18) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3463399 Jet Propulsion Laboratory 4 August 2017 2004 KV18 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2004+KV18 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 2004 KV18 The Tracking News – Observations of small Solar-System bodies http://www.hohmanntransfer.com/mn/11/11209_0728.htm#K11O47 4 August 2017 31 March 2016 https://web.archive.org/web/20160331121244/http://www.hohmanntransfer.com/mn/11/11209_0728.htm#K11O47 dead Pu Guan Li-Yong Zhou Jian Li November 2012 Trailing (L5) Neptune Trojans: 2004 KV18 and 2008 LC18 Research in Astronomy and Astrophysics 12 11 1549–1562 2012RAA....12.1549G 10.1088/1674-4527/12/11/009 1205.2206 119194002 Li-Yong Zhou Rudolf Dvorak Yi-Sui Sun September 2009 The dynamics of Neptune Trojan - I. The inclined orbits Monthly Notices of the Royal Astronomical Society 398 3 1217–1227 2009MNRAS.398.1217Z 10.1111/j.1365-2966.2009.15203.x free 0906.5075 14557308 External links MPEC 2011-O47 : 2004 KV18, MPEC –Minor Planet Electronic Circular 2004KV18 3463399 # Category:Minor planet object articles (unnumbered) 20040524