17492 Hippasos

Trojan asteroid June 2018 yes 17492 Hippasos #C2FFFF F. Börngen Karl Schwarzschild Obs. 10 December 1991 (17492) Hippasos 1991 XG 11989 UA 10 Hippasian ˈ h ɪ p ə s ə s'Hippasus' in Noah Webster (1884) A Practical Dictionary of the English Language Hippasus (Hippasos)(Greek mythology) Jupiter trojanTrojanEnnomos 23 March 2018 (JD 2458200.5) 0 40.69 yr (14,862 d) 5.4914 AU 4.7972 AU 5.1443 AU 0.0675 11.67 yr (4,262 d) 241.97° 0.0845 ms / day 29.199° 89.019° 218.74° 0.2721 AU 2.7430 53.98 0.78 km55.67 km (calculated) 17.75 0.01 hlightcurve-plot-Stephens 0.057 (assumed)0.066 0.008 C (assumed) 9.910.0 17492 Hippasos (ˈ h ɪ p ə s ə sprovisional designation 1991 XG 1) is a Jupiter trojan and member of the Ennomos family from the Trojan camp, approximately 54 km mi off 2 us in diameter. It was discovered on 10 December 1991, by astronomer Freimut Börngen at the Karl Schwarzschild Observatory in Tautenburg, Germany. The Jovian asteroid belongs to the 80 largest Jupiter trojans and has a rotation period of 17.8 hours. It was named after the Trojan prince Hippasus (Hippasos) from Greek mythology. Orbit and classification Hippasos is a Jovian asteroid in the so-called Trojan camp, located in the Lagrangian point, 60° behind Jupiter, orbiting in a 1:1 resonance with the Gas Giant (see Trojans in astronomy). It orbits the Sun at a distance of 4.8–5.5 AU once every 11 years and 8 months (4,262 days; semi-major axis of 5.14 AU). Its orbit has an eccentricity of 0.07 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 Siding Spring Observatory in September 1977, more than 14 years prior to its official discovery observation at Tautenburg. Asteroid family Hippasos is a member of the Ennomos family (009), one of few known Jovian asteroid families, named after 4709 Ennomos (see also 4709 Ennomos Small Ennomos family). A different HCM analysis finds this asteroid to be the parent body of its own Hippasos family, first described by Jakub Rozehnal and Miroslav Brož in 2014. According to the astronomers' model, the Hippasos family consists of 104 known members, and was formed 1 to 2 billion years ago. The extrapolated size of the original body is between 67 and 168 kilometers, which is strongly influenced by the amount of possible interlopers into the family. Naming This minor planet was named from Greek mythology after the Trojan prince Hippasus (Hippasos). The son of King Priam supported Aeneas in the Trojan War. The official naming citation was published by the Minor Planet Center on 9 March 2001 (M.P.C. 42365). Physical characteristics Hippasos is an assumed C-type asteroid, while most larger Jupiter trojans are D-type asteroids. Rotation period In December 2013, a rotational lightcurve of Hippasos was obtained from photometric observations by Robert Stephens at the Center for Solar System Studies in Landers, California. Lightcurve analysis gave a well-defined rotation period of 17.75 0.01 hours with a brightness amplitude of 0.21 magnitude (U=3).lightcurve-plot-Stephens Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Hippasos measures 53.98 kilometers in diameter and its surface has an albedo 0.066, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 55.67 kilometers based on an absolute magnitude of 10.0. Notes lightcurve-plot-Stephens Lightcurve plot of (17492) Hippasos from Nov 2013 by Robert Stephens at the Center for Solar System Studies U81. Quality code is 3- (lightcurve rating at CS3). Summary figures at the LCDB and CS3 website. References 30em 2018-05-25 last obs. JPL Small-Body Database Browser: 17492 Hippasos (1991 XG1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2017492 Jet Propulsion Laboratory 18 June 2018 17492 Hippasos (1991 XG1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=17492 18 June 2018 List of Jupiter Trojans Minor Planet Center V. Carruba 1 June 2018 https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html 18 June 2018 Asteroid (17492) Hippasos – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=17492&pc=1.1.6 18 June 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 18 June 2018 Asteroid 17492 Hippasos Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=17492+Hippasos https://web.archive.org/web/20180618230219/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=17492+Hippasos dead 18 June 2018 18 June 2018 D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 119280014 J. Rozehnal M. Brož July 2014 Long-term evolution of asteroid families among Jovian Trojans http://sirrah.troja.mff.cuni.cz/yarko-site/publications/Rozehnal_Broz_2014_ACM_poster.pdf Asteroids 452 2014acm..conf..452R 5 July 2018 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) 17492 18 June 2018 Robert D. Stephens Linda M. French Chelsea Davitt Daniel R. Coley April 2014 At the Scaean Gates: Observations Jovian Trojan Asteroids, July- December 2013 The Minor Planet Bulletin 41 2 95–100 1052-8091 2014MPBu...41...95S External links 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 (15001)-(20000) – Minor Planet Center 17492 17492 17493 Wildcat 017492 017492 Category:Discoveries by Freimut Börngen Category:Named minor planets 19911210