11429 Demodokus

Trojan asteroid July 2018 yes 11429 Demodokus #C2FFFF 011429-asteroid shape model (11429) Demodokus.png Shape model of Demodokus from its lightcurve C. J. van HoutenI. van Houten-G.T. Gehrels Palomar Obs. 24 September 1960 (11429) Demodokus 4655 P-L1996 RZ 32PLS4655 d ᵻ ˈ m ɒ d ə k ə s Δημόδοκος Dēmodokos(Greek mythology) Jupiter trojanGreekbackground 23 March 2018 (JD 2458200.5) 0 57.65 yr (21,056 d) 5.3994 AU 5.1057 AU 5.2525 AU 0.0280 12.04 yr (4,397 d) 173.02° 0.0819 ms / day 17.081° 6.3025° 89.223° 0.2122 AU 2.9110 37.63 1.31 km46.30 km (calculated) 50.16 0.06 hlightcurve-plots-CS3 0.057 (assumed)0.086 0.017 C (assumed) 10.40 11429 Demodokus d ᵻ ˈ m ɒ d ə k ə s is a mid-sized Jupiter trojan from the Greek camp, approximately 38 km mi off 2 us in diameter. It was discovered during the Palomar–Leiden survey at the Palomar Observatory in 1960 and later named after the blind singer Demodocus from Greek mythology. The dark Jovian asteroid has a longer-than average rotation period of 50.2 hours. Discovery Demodokus was discovered on 24 September 1960, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by astronomer Tom Gehrels at the Palomar Observatory in California. The body's observation arc begins with its official discovery observation at Palomar. Palomar–Leiden survey The survey designation "P-L" stands for "Palomar–Leiden", named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroids. Naming This minor planet was named from Greek mythology after Demodocus, the blind singer at the court of King Alcinous, who is the ruler of the Phaiacians in Homer's Odyssey. The official naming citation was published by the Minor Planet Center on 24 January 2000 (M.P.C. 38201). Orbit and classification Demodokus is a dark Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's Lagrangian point, 60° ahead on its orbit (see Trojans in astronomy). It is also a non-family asteroid of the Jovian background population. It orbits the Sun at a distance of 5.1–5.4 AU once every 12.04 years (4,397 days; semi-major axis of 5.25 AU). Its orbit has an eccentricity of 0.03 and an inclination of 17° with respect to the ecliptic. Physical characteristics Demodokus is an assumed C-type asteroid, while the majority of larger Jupiter trojans are D-types. Rotation period In February 2014, a rotational lightcurve of Demodokus was obtained over five consecutive nights of photometric observations by Robert Stephens at the Center for Solar System Studies. Lightcurve analysis gave a longer-than average rotation period of 50.16 0.06 hours with a relatively low brightness amplitude of 0.18 magnitude (U=2).lightcurve-plots-CS3 Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Demodokus measures 37.63 kilometers in diameter and its surface has an albedo of 0.086, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 46.3 kilometers based on an absolute magnitude of 10.4. Notes lightcurve-plots-CS3 Lightcurve plots of (11429) Demodokus from Feb 2014 by Robert Stephens at the Center for Solar System Studies U81. Quality code is 2+ (lightcurve rating at CS3). Summary figures at the LCDB and CS3. References 30em 2018-05-19 last obs. JPL Small-Body Database Browser: 11429 Demodokus (4655 P-L) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011429 Jet Propulsion Laboratory 3 July 2018 11429 Demodokus (4655 P-L) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=11429 3 July 2018 List of Jupiter Trojans Minor Planet Center V. Carruba 1 July 2018 https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html 3 July 2018 Minor Planet Discoverers Minor Planet Center https://www.minorplanetcenter.net/iau/lists/MPDiscsNum.html 2018 3 July 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 3 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759...49G The Astrophysical Journal 759 1 10 2012ApJ...759...49G 10.1088/0004-637X/759/1/49 1209.1549 119101711 3 July 2018 (online catalog) Asteroid (11429) Demodokus – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=11429&pc=1.1.6 3 July 2018 11429 3 July 2018 Robert D. Stephens Daniel R. Coley Linda M. French October 2014 Trojan Asteroids Observed from CS3: 2014 January–May http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..210S The Minor Planet Bulletin 41 4 210–212 1052-8091 2014MPBu...41..210S 3 July 2018 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 (10001)-(15000) – Minor Planet Center Asteroid 11429 Demodokus https://web.archive.org/web/20180704005917/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=11429%20Demodokus 4 July 2018 at the Small Bodies Data Ferret 11429 2011429 11428 Alcinoös 11429 11430 Lodewijkberg 011429 Category:Discoveries by Cornelis Johannes van Houten Category:Discoveries by Ingrid van Houten-Groeneveld Category:Discoveries by Tom Gehrels 4655 Category:Named minor planets 19600924