16974 Iphthime

Trojan binary asteroid March 2020 yes 16974 Iphthime #C2FFFF 16974 Iphthime Hubble.jpg Hubble Space Telescope image of Iphthime taken in 2013 LINEAR Lincoln Lab's ETS 18 November 1998 (16974) Iphthime 1998 WR 211974 WX1986 WS Iphthimean ɪ f ' θ aɪ m iːNoah Webster (1884) A Practical Dictionary of the English Language Iphthime Iphthīmē/Ἰφθῑμη(Greek mythology) Jupiter trojanGreekbackground 23 March 2018 (JD 2458200.5) 0 42.86 yr (15,655 d) 5.5556 AU 4.8248 AU 5.1902 AU 0.0704 11.82 yr (4,319 d) 261.74° 0.0834 ms / day 15.036° 241.56° 134.72° 0.0605 AU 2.9270 55.43 4.0 km57.15 3.85 km57.34 0.33 km 78.9 0.4 h 0.065 0.0100.066 0.0090.0691 0.011 C (assumed)V–I 0.960 0.035 9.80 16974 Iphthime (ɪ f ' θ aɪ m iː; provisional designation 1998 WR 21) is a Jupiter trojan and a binary system from the Greek camp, approximately 57 km mi off 2 us in diameter. It was discovered on 18 November 1998, by astronomers with the Lincoln Near-Earth Asteroid Research at the ETS Test Site in Socorro, New Mexico. The dark Jovian asteroid belongs to the 80 largest Jupiter trojans and has a notably slow rotation of 78.9 hours. It was named after Iphthime from Greek mythology. The discovery of its companion by Hubble Space Telescope was announced in March 2016. Orbit and classification Iphthime is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's Lagrangian point, 60° ahead of its 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 4.8–5.6 AU once every 11 years and 10 months (4,319 days; semi-major axis of 5.19 AU). Its orbit has an eccentricity of 0.07 and an inclination of 15° with respect to the ecliptic. The body's observation arc begins with its first observation as 1974 WX at Crimea-Nauchnij in November 1974, or 24 years prior to its official discovery observation at Socorro. Naming This minor planet was named from Greek mythology after Iphthime, sister of Penelope and daughter of Icarius. Iphthime appears in her sister's dream to comfort her as she is grieving. The official naming citation was published by the Minor Planet Center on 3 December 2017 (M.P.C. 107739). Physical characteristics Iphthime is an assumed C-type asteroid. Its V–I color index of 0.96 is typical for D-type asteroids, the most common spectral type among the larger Jupiter trojans. Rotation period thumb|left|Iphthime and its companion imaged by the Hubble Space Telescope in 2018 In October 2009, a rotational lightcurve of Iphthime was obtained for the first time by Stefano Mottola from photometric observations during seven nights at the Calar Alto Observatory in Spain. Lightcurve analysis gave a long rotation period of 78.9 0.4 hours or 3.3 days with a brightness amplitude of 0.25 magnitude (U=2+). Diameter and albedo According to the 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, Iphthime measures between 55.43 and 57.341 kilometers in diameter and its surface has an albedo between 0.065 and 0.069. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.0691 and a diameter of 55.43 kilometers based on an absolute magnitude of 9.8. References 30em 2017-09-28 last obs. JPL Small-Body Database Browser: 16974 Iphthime (1998 WR21) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2016974 Jet Propulsion Laboratory 18 June 2018 16974 Iphthime (1998 WR21) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=16974 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 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 18 June 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) Asteroid (16974) Iphthime – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=16974&pc=1.1.6 18 June 2018 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 18 June 2018 16974 18 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) 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 External links (16974) Iphthime, Asteroids with Satellites Database, Johnston's Archive Lightcurve Database Query (LCDB), at www.minorplanet.info Dictionary of Minor Planet Names, Google books Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center Asteroid 16974 Iphthime https://web.archive.org/web/20180618025722/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=16974%20Iphthime 18 June 2018 at the Small Bodies Data Ferret 16974 16973 Gaspari 16974 16975 Delamere 016974 016974 Category:Named minor planets 016974 19981118