(79983) 1999 DF9

Trans-Neptunian object of the Kuiper belt July 2024 yes (79983) 1999 DF 9 #C2E0FF 20 February 1999 J. X. LuuC. TrujilloD. C. Jewitt Kitt Peak National Obs. (79983) 1999 DF 9 TNOcubewano 4 September 2017 (JD 2458000.5) 2 17.06 yr (6,231 days) 53.567 AU 39.830 AU 46.698 AU 0.1471 319.12 yr (116,560 days) 19.489° 0.0031 ms / day 9.8105° 334.84° 178.63° 0 265 km (calculated)306 km 6.65 h 0.10 (assumed) B–V = 0.920 0.060V–R = 0.710 0.050V–I = 1.360 0.060 5.797 0.110 (R)6.0 (79983) 1999 DF 9 is a trans-Neptunian object of the Kuiper belt, classified as a non-resonant cubewano, that measures approximately 270 kilometers in diameter. Discovery It was discovered on 20 February 1999, by American and British astronomers Jane Luu, Chad Trujillo and David C. Jewitt at the U.S. Kitt Peak National Observatory in Arizona. As no precoveries were taken, the minor planet's observation arc begins with its discovery observation in 1999. Classification and orbit The minor planet is a classical Kuiper belt object or "cubewano", which are not in an orbital resonance with Neptune and do not cross the giant planet's orbit. It orbits the Sun at a distance of 39.8–53.6 AU once every 319 years and 1 month (116,560 days). Its orbit has an eccentricity of 0.15 and an inclination of 10° with respect to the ecliptic. This makes it a relatively eccentric body for a classical Kuiper belt object, which typically have low-eccentricities of 0.10 or less. Physical characteristics In February 2001, a rotational lightcurve was published for this minor planet from photometric observations by Portuguese astronomer Pedro Lacerda and the discovering astronomer Jane Luu. Lightcurve analysis gave a relatively short rotation period of 6.65 hours with a brightness variation of 0.40 magnitude (U=2). The Collaborative Asteroid Lightcurve Link assumes a low albedo of 0.10 and calculates a mean-diameter of 265 kilometers, based on an absolute magnitude of 6.0, while Johnston's Archive give a diameter of 306 kilometers for an albedo of 0.09. Numbering and naming This minor planet was numbered by the Minor Planet Center on 4 May 2004. As of 2025, it has not been named. References 13 March 2016 last obs. JPL Small-Body Database Browser: 79983 (1999 DF9) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2079983 Jet Propulsion Laboratory 1 June 2017 79983 (1999 DF9) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=79983 31 August 2016 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 O. R. Hainaut H. Boehnhardt S. Protopapa October 2012 Colours of minor bodies in the outer solar system. II. A statistical analysis revisited Astronomy and Astrophysics 546 20 2012A&A...546A.115H 10.1051/0004-6361/201219566 1209.1896 54776793 List of Known Trans-Neptunian Objects Johnston's Archive Robert Johnston 7 October 2018 http://www.johnstonsarchive.net/astro/tnoslist.html 12 November 2018 79983 31 August 2016 Pedro Lacerda Jane Luu April 2006 Analysis of the Rotational Properties of Kuiper Belt Objects The Astronomical Journal 131 4 2314–2326 2006AJ....131.2314L 10.1086/501047 astro-ph/0601257 14950702 N. Peixinho A. Delsanti A. Guilbert-Lepoutre R. Gafeira P. Lacerda October 2012 The bimodal colors of Centaurs and small Kuiper belt objects Astronomy and Astrophysics 546 12 2012A&A...546A..86P 10.1051/0004-6361/201219057 1206.3153 55876118 Marc W. Buie Marc W. Buie Orbit Fit and Astrometric record for 79983 SwRI (Space Science Department) http://www.boulder.swri.edu/~buie/kbo/astrom/79983.html 17 February 2018 External links List Of Transneptunian Objects, Minor Planet Center https://newton.spacedys.com/cgi-bin/astdys/astibo?objects:1999DF9;mainJanuary 2021 InternetArchiveBot yes Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Discovery Circumstances: Numbered Minor Planets (75001)-(80000) – Minor Planet Center 79983 79983 (79983) 1999 DF 9 079983 079983 Category:Discoveries by Chad Trujillo Category:Discoveries by David C. Jewitt 19990220