(5646) 1990 TR

Probable rare-type binary asteroid October 2019 yes (5646) 1990 TR #FFC2E0 11 October 1990 S. UedaH. Kaneda Kushiro Obs. (5646) 1990 TR AmorNEO 4 September 2017 (JD 2458000.5) 0 26.90 yr (9,825 days) 3.0791 AU 1.2087 AU 2.1439 AU 0.4362 3.14 yr (1,147 days) 218.56° 0.3140 ms / day 7.9118° 14.141° 335.68° 0.2112 AU 82.3 LD 1 2.03 0.52 km2.30 km (derived)2.50 0.05 km2.723 0.525 km4.3 km (dated) 3.1999 0.0002 h3.204 0.002 h6.25 h 0.18 (assumed)0.19 0.030.454 0.1940.65 0.430.66 0.42 SMASS = UQSU 14.315.0015.415.4515.67 (5646) 1990 TR is a probable rare-type binary asteroid classified as a near-Earth object of the Amor group, approximately 2.3 kilometers in diameter. It was discovered on 11 October 1990, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at Kushiro Observatory near Kushiro, in eastern Hokkaido, Japan. Orbit The asteroid orbits the Sun at a distance of 1.2–3.1 AU once every 3 years and 2 months (1,147 days). Its orbit has an eccentricity of 0.44 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins with its first observation at the Siding Spring Observatory, five months prior to its official discovery observation at Kushiro. Lightcurve In December 2012, the so far best rated rotational lightcurve was obtained by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave a rotation period of 3.1999 hours with a brightness variation of 0.12 magnitude (U=3). Photometric observations also gave a period of 19.47 hours for a probable asteroid moon, with a measured diameter-ratio of 0.18 0.02, which translates into a diameter of 400 meters for its moon. Diameter and albedo According to the surveys carried out by the Spitzer Space Telescope and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 2.03 and 2.723 kilometers in diameter and its surface has an albedo of 0.19 and 0.66. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and derives a diameter of 2.3 kilometers based on an absolute magnitude of 15.67. References 2017-03-27 last obs. JPL Small-Body Database Browser: 5646 (1990 TR) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005646 Jet Propulsion Laboratory 26 May 2017 5646 (1990 TR) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=5646 12 February 2017 2013-11-18 Binary and Ternary near-Earth Asteroids detected by radar NASA/JPL Asteroid Radar Research Dr. Lance A. M. Benner http://echo.jpl.nasa.gov/~lance/binary.neas.html https://web.archive.org/web/20040608071121/http://echo.jpl.nasa.gov/~lance/binary.neas.html dead 2004-06-08 2014-03-01 6 A. Mainzer T. Grav J. Bauer J. Masiero R. S. McMillan R. M. Cutri R. Walker E. Wright P. Eisenhardt D. J. Tholen T. Spahr R. Jedicke L. Denneau E. DeBaun D. Elsbury T. Gautier S. Gomillion E. Hand W. Mo J. Watkins A. Wilkins G. L. Bryngelson A. Del Pino Molina S. Desai M. Gómez Camus S. L. Hidalgo I. Konstantopoulos J. A. Larsen C. Maleszewski M. A. Malkan J.-C. Mauduit B. L. Mullan E. W. Olszewski J. Pforr A. Saro J. V. Scotti L. H. Wasserman December 2011 NEOWISE Observations of Near-Earth Objects: Preliminary Results The Astrophysical Journal 743 2 17 2011ApJ...743..156M 10.1088/0004-637X/743/2/156 1109.6400 239991 5646 12 February 2017 6 Michael Mueller M. Delbo' J. L. Hora D. E. Trilling B. Bhattacharya W. F. Bottke S. Chesley J. P. Emery G. Fazio A. W. Harris A. Mainzer M. Mommert B. Penprase H. A. Smith T. B. Spahr J. A. Stansberry C. A. Thomas April 2011 ExploreNEOs. III. Physical Characterization of 65 Potential Spacecraft Target Asteroids The Astronomical Journal 141 4 9 2011AJ....141..109M 10.1088/0004-6256/141/4/109 44827674 https://authors.library.caltech.edu/23152/1/Mueller2011p13239Astron_J.pdf 6 C. A. Thomas D. E. Trilling J. P. Emery M. Mueller J. L. Hora L. A. M. Benner B. Bhattacharya W. F. Bottke S. Chesley M. Delbó G. Fazio A. W. Harris A. Mainzer M. Mommert A. Morbidelli B. Penprase H. A. Smith T. B. Spahr J. A. Stansberry September 2011 ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population The Astronomical Journal 142 3 12 2011AJ....142...85T 10.1088/0004-6256/142/3/85 free Cristina A. Thomas Joshua P. Emery David E. Trilling Marco Delbó Joseph L. Hora Michael Mueller January 2014 Physical characterization of Warm Spitzer-observed near-Earth objects Icarus 228 217–246 2014Icar..228..217T 10.1016/j.icarus.2013.10.004 1310.2000 119278697 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 118700974 6 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 119289027 free Wisniewski, Wieslaw Z. December 1992 The unusual lightcurve of 1990 TR In Lunar and Planetary Inst. 653 1992acm..proc..653W Warner, Brian D. April 2013 Seeing Double Old and New: Observations and Lightcurve Analysis at the Palmer Divide Observatory of Six Binary Asteroids The Minor Planet Bulletin 40 2 94–98 32259164 7120868 1052-8091 2013MPBu...40...94W Warner, Brian D. April 2016 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 October–December The Minor Planet Bulletin 43 2 143–154 32455373 7243997 1052-8091 2016MPBu...43..143W B. Carry E. Solano S. Eggl F. E. DeMeo April 2016 Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry Icarus 268 340–354 2016Icar..268..340C 10.1016/j.icarus.2015.12.047 1601.02087 119258489 External links Lightcurve plot of (5646) 1990 TR, Palmer Divide Observatory, B. D. Warner (2012) Asteroids with Satellites, Robert Johnston, johnstonsarchive.net 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 Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend 5646 5646 1990TR (5645) 1990 SP 5646 (5647) 1990 TZ 005646 Category:Discoveries by Hiroshi Kaneda Category:Discoveries by Seiji Ueda 005646 005646 19901011