1437 Diomedes

Trojan asteroid March 2018 yes 1437 Diomedes #C2FFFF 001437-asteroid shape model (1437) Diomedes.png Modelled shape of Diomedes from its light curve K. Reinmuth Heidelberg Obs. 3 August 1937 (1437) Diomedes 1937 PB1931 DN1936 PQ1971 RD Diomedian ˌ d aɪ ə ˈ m iː d iː zDiomedes Diomedes(Greek mythology) Jupiter trojanGreekbackground 23 March 2018 (JD 2458200.5) 0 80.80 yr (29,514 d) 5.4248 AU 4.9720 AU 5.1984 AU 0.0435 11.85 yr (4,329 d) 234.43° 0.0832 ms / day 20.485° 315.80° 130.93° 0.275 AU 2.8720 284 × 126 × 65 km 117.79 1.18 km132.5 km164.31 4.1 km172.60 3.42 km173.0 km 16 h18 h21 h24.46 h24.49 0.01 h 0.028 0.0010.0313 0.0020.061 0.011 Tholen DPU–B 0.250 040B–V 0.700 014V–I 0.810 0.025 8.18 0.288.30 1437 Diomedes ˌ d aɪ ə ˈ m iː d iː z is a large Jupiter trojan from the Greek camp, approximately 150 km mi off 1 us in diameter. It was discovered on 3 August 1937, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The dark D/P-type asteroid belongs to the largest Jupiter trojans and has a notably elongated shape and a longer than average rotation period of 24.49 hours. Diomedes was the first Jupiter trojan successfully observed during an occultation event of star. It was named after the hero Diomedes from Greek mythology. Orbit and classification Diomedes 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. Jupiter trojans are thought to have been captured into their orbits during or shortly after the early stages of the formation of the Solar System. More than 4,500 Jupiter trojans in the Greek camp have already been discovered. It orbits the Sun at a distance of 5.0–5.4 AU once every 11 years and 10 months (4,329 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.04 and an inclination of 20° with respect to the ecliptic. The asteroid was first observed as 1931 DN at Lowell Observatory in February 1931. The body's observation arc begins at Heidelberg with its official discovery observation in August 1937. Physical characteristics In the Tholen classification, Diomedes has an ambiguous spectral type, closest to the dark D-type asteroids and somewhat similar to the primitive P-type asteroids. Its V–I color index of 0.810 is also lower than that measured for most D-type Jupiter trojans (0.95). Rotation period Several rotational lightcurves of Diomedes have been obtained from photometric observations since the 1960s. The so-far best-rated photometric observations by Robert Stephens at the Goat Mountain Astronomical Research Station G79 and Santana Observatory 646 in November 2008, gave a longer-than average rotation period of 24.49 0.01 hours with a brightness variation of 0.34 magnitude (U=3-). Diameter and albedo In the 1970s, radiometric observations were published in the Tucson Revised Index of Asteroid Data (TRIAD) compilation gave a diameter of 173.0 kilometers with a radiometric albedo 0.021. According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Diomedes measures between 117.786 and 172.60 kilometers in diameter and its surface has an albedo between 0.028 and 0.061. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0313 and a diameter of 164.31 kilometers based on an absolute magnitude of 8.30. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0313 and a diameter of 164.31 kilometers based on an absolute magnitude of 8.30. Diomedes is the third largest Jupiter trojan according to IRAS and Akari, and the 9th largest based on NEOWISE data: Occultation and shape Diomedes was the first Jupiter trojan that was successfully observed during an asteroid occultation, when it occulted the star HIP 014402A over Japan on 7 November 1997. The silhouette was elongated with a major and minor occultation axis of 284 × 126 kilometers (poor fit). The ellipsoid dimensions of 284 × 126 × 65 kilometers – corresponding to a mean diameter of 132.5 kilometers, equivalent to the volume of a sphere – were estimated using follow-up photometry at Ondřejov Observatory and Mitaka Observatory 388 that determined the body's rotational phase at the exact time of the occultation event. Naming This minor planet was named from Greek mythology after the hero Diomedes, King of Argos and known for his participation in the Trojan War, regarded as the best warriors of the Achaeans, just behind Achilles and alongside Ajax. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 129). References 30em 2017-09-27 last obs. JPL Small-Body Database Browser: 1437 Diomedes (1937 PB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001437 https://web.archive.org/web/20200711150459/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001437 dead 11 July 2020 Jet Propulsion Laboratory 26 October 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 115 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1438 (1437) Diomedes 1437 Diomedes (1937 PB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1437 26 October 2017 List of Jupiter Trojans Minor Planet Center 7 October 2017 https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html 26 October 2017 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 (1437) Diomedes – Proper elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=1437&pc=1.1.6 13 June 2018 Asteroid 1437 Diomedes Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1437+Diomedes 13 June 2018 13 June 2018 https://web.archive.org/web/20180613162615/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1437+Diomedes dead 1437 26 October 2017 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 free (online, AcuA catalog p. 153) 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 J. L. Dunlap T. Gehrels August 1969 Minor Planets. III. Lightcurves of a Trojan Asteroid http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1969AJ.....74..796D Astronomical Journal 74 796 1969AJ.....74..796D 10.1086/110860 26 October 2017 Taylor, Ronald C. December 1970 Photometric Observations and Reductions of Lightcurves of Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1971NASSP.267..117T Physical Studies of Minor Planets 267 117–131 1971NASSP.267..117T 26 October 2017 Richard P. Binzel Linda M. Sauter February 1992 Trojan, Hilda, and Cybele asteroids – New lightcurve observations and analysis http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1992Icar...95..222B Icarus 95 2 222–238 0019-1035 1992Icar...95..222B 10.1016/0019-1035(92)90039-A 26 October 2017 Isao Sato Lenka Sarounová Hideo Fukushima May 2000 Size and Shape of Trojan Asteroid Diomedes from Its Occultation and Photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2000Icar..145...25S Icarus 145 1 25–32 2000Icar..145...25S 10.1006/icar.1999.6316 26 October 2017 Stephens, Robert D. April 2009 Asteroids Observed from GMARS and Santana Observatories http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MPBu...36...59S The Minor Planet Bulletin 36 2 59–62 1052-8091 2009MPBu...36...59S 26 October 2017 6 Stefano Mottola Mario Di Martino Anders Erikson Maria Gonano-Beurer Albino Carbognani Uri Carsenty Gerhard Hahn Hans-Josef Schober Felix Lahulla Marco Delbò Claes-Ingvar Lagerkvist May 2011 Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects The Astronomical Journal 141 5 32 2011AJ....141..170M 10.1088/0004-6256/141/5/170 free 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 ) Dictionary of Minor Planet Names, Google books Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1437 1436 Salonta 1437 1438 Wendeline 001437 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 001437 19370803