15440 Eioneus

Jupiter trojan from the Greek camp June 2018 yes 15440 Eioneus #C2FFFF CSS Catalina Stn. 19 November 1998 (15440) Eioneus 1998 WX 41992 LD Eione(i)an Eioneus(Greek mythology) Jupiter trojanGreekbackground 23 March 2018 (JD 2458200.5) 0 66.48 yr (24,280 d) 5.4151 AU 5.1821 AU 5.2986 AU 0.0220 12.20 yr (4,455 d) 240.92° 0.0808 ms / day 28.743° 120.55° 279.64° 0.0063 AU 2.7510 62.52 0.83 km66.48 3.8 km71.88 3.87 km 21.43 0.02 hlightcurve-plots-Stephens 0.072 0.0110.079 0.0090.0916 0.011 C (assumed)V–I 0.970 0.041 9.109.59.69.68 0.31 15440 Eioneus (provisional designation: 1998 WX 4) is a dark Jupiter trojan from the Greek camp, approximately 66 km mi off 2 us in diameter. It was discovered on 19 November 1998, by astronomers with the Catalina Sky Survey at the Catalina Station near Tucson, Arizona, in the United States. The assumed C-type asteroid belongs to the 60 largest Jupiter trojans. It has a rotation period of 21.43 hours and possibly a spherical shape. It was named from Greek mythology after Eioneus who was killed by Hector. Orbit and classification Eioneus is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population. It orbits the Sun at a distance of 5.2–5.4 astronomical units (AU) once every 12 years and 2 months (4,455 days; semi-major axis of 5.3 AU). Its orbit has an eccentricity of 0.02 and an inclination of 29° with respect to the ecliptic. The body's observation arc begins with a precovery published by the Digitized Sky Survey and taken at the Palomar Observatory in November 1951, or 47 years prior to its official discovery observation at Catalina. Naming This minor planet was numbered on 21 June 2000 (M.P.C. 40826). On 14 May 2021, the object was named from Greek mythology by the Working Group for Small Bodies Nomenclature (WGSBN), after the Greek warrior Eioneus who was killed by a spear from Hector during the Trojan War. Physical characteristics Eioneus is an assumed C-type asteroid, while the majority of large Jupiter trojans are D-types. It has a typical V–I color index of 0.97. Rotation period Since January 2013, a large number of a rotational lightcurve of Eioneus have been obtained from photometric observations by Robert Stephens at the Center for Solar System Studies in California.lightcurve-plots-Stephens Analysis of the best-rated lightcurve from June 2017 gave a longer-than-average rotation period of 21.43 0.02 h hours with a low brightness amplitude of 0.09 0.02 magnitude (U=2+), indicative of a rather spherical shape. Diameter and albedo According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Eioneus measures between 62.52 and 71.88 kilometers in diameter and its surface has an albedo between 0.072 and 0.092. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0585 and a diameter of 66.04 kilometers based on an absolute magnitude of 9.6. Notes lightcurve-plots-Stephens Lightcurve plots of (15440) 1998 WX4 from 2013, 2014, 2015, 2016 and 2017 by Robert Stephens at the Center for Solar System Studies U81. Quality code is n.a/n.a/2+/3-/3-. (lightcurve rating at CS3). Summary figures at the LCDB and CS3. References 30em 2018-05-20 last obs. JPL Small-Body Database Browser: 15440 (1998 WX4) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015440 Jet Propulsion Laboratory 14 June 2018 List of Jupiter Trojans Minor Planet Center 30 May 2018 https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html 14 June 2018 15440 (1998 WX4) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=15440 14 June 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 14 June 2018 WGSBN Bulletin Archive Working Group for Small Bodies Nomenclature 14 May 2021 https://www.wgsbn-iau.org/files/Bulletins/index.html 16 May 2021 (Bulletin #1) T. Grav A. K. Mainzer J. M. Bauer J. R. Masiero C. R. Nugent November 2012 WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy The Astrophysical Journal 759 1 10 2012ApJ...759...49G 10.1088/0004-637X/759/1/49 1209.1549 119101711 (online catalog) Asteroid (15440) 1998 WX4 – Proper elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=15440&pc=1.1.6 5 June 2018 Asteroid (15440) 1998 WX4 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15440 14 June 2018 14 June 2018 https://web.archive.org/web/20180614171853/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15440 dead E. F. Tedesco P. V. Noah M. Noah S. D. Price October 2004 IRAS Minor Planet Survey V6.0 https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 15 June 2018 15440 14 June 2018 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 (online, AcuA catalog p. 153) Robert D. Stephens Brian D. Warner October 2017 Lightcurve Analysis of L4 Trojan Asteroids at the Center for Solar System Studies 2017 April–June The Minor Planet Bulletin 44 4 312–316 1052-8091 2017MPBu...44..312S Robert D. Stephens Daniel R. Coley Brian D. Warner Linda, M. French October 2016 Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies The Minor Planet Bulletin 43 4 323–331 1052-8091 2016MPBu...43..323S Robert D. Stephens Daniel, R. Coley Linda M. French January 2016 Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies The Minor Planet Bulletin 43 1 15–22 1052-8091 2016MPBu...43...15S 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center 15440 2015440 15440 015440 015440 Category:Named minor planets 19981119