(6265) 1985 TW3

Main-belt asteroid binary November 2018 yes (6265) 1985 TW 3 #D6D6D6 T. F. FricR. J. Gilbrech Palomar Obs. 11 October 1985 (6265) 1985 TW 3 1953 RK 11969 TZ 41979 YG 91985 VQ 11987 GD 11990 CX main-belt(inner)background 27 April 2019 (JD 2458600.5) 0 48.42 yr (17,685 d) 2.5839 AU 1.7476 AU 2.1658 AU 0.1931 3.19 yr (1,164 d) 228.64° 0.3092 ms / day 4.1152° 45.173° 281.59° 1 (D: 1.16 km; P: 15.9 h) 4.954 0.100 km5.20 0.22 km 2.70932 0.00008 h 0.2850.2860.2865 L (SDSS-MOC) 13.4013.5013.6 (6265) 1985 TW 3 is a background asteroid and binary system from the inner regions of the asteroid belt. It was discovered on 11 October 1985, by astronomer by T. F. Fric and Richard Gilbrech at the Palomar Observatory in California. It is the only minor-planet discovery for these two astronomers. The stony L-type asteroid measures approximately 5 km mi off 2 us in diameter and has a rotation period of 2.7 hours. Its 1.2-kilometer sized minor-planet moon was discovered in July 2007 and announced the following month. Orbit and classification 1985 TW 3 is a non-family asteroid from the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt. It orbits the Sun in the inner asteroid belt at a distance of 1.7–2.6 AU once every 3 years and 2 months (1,164 days; semi-major axis of 2.17 AU). Its orbit has an eccentricity of 0.19 and an inclination of 4° with respect to the ecliptic. It was first observed as 1953 RK 1 at the former Alma-Ata Observatory 210 in September 1953. The body's observation arc begins with its observation as 1979 YG 9 at Crimea–Nauchnij in December 1979, or almost 6 years prior to its official discovery observation at Palomar Observatory. Numbering and naming This minor planet was permanently numbered 6265 (6265) by the Minor Planet Center on 17 March 1995 (M.P.C. 24890–24891). As of 2018, it has not been named. Physical characteristics In the SDSS-based taxonomy, 1985 TW 3 is an unusual L-type asteroid. Rotation period In June 2010, a rotational lightcurve of 1985 TW 3 was obtained from photometric observations by Australian astronomers David Higgins and Julian Oey at the Hunters Hill E14 and Leura Observatory E17. Lightcurve analysis gave a well-defined rotation period of 2.70932 0.00008 hours with a brightness variation of 0.35 magnitude (U=3). Several concurring period determinations in the range of 2.7091 to 2.710 hours with an amplitude of 0.26 to 0.36 magnitude were also made between 2007 and 2013 (U=3/3/3/3-/2). Satellite During a previous photometric observation by David Higgins on 15 July 2007, it was revealed that 1985 TW 3 is a binary asteroid with a minor-planet moon in its orbit. The discovery was announced on 2 August 2007. The satellite measures approximately 1.16 kilometers. It is separated by 8 km from its primary, orbiting it once every 15 hours and 52 minutes (15.859 hours or 0.6608 days). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), 1985 TW 3 measures between 4.95 and 5.20 kilometers in diameter and its surface has an albedo between 0.285 and 0.287. The Johnston's archive derives a diameter of 4.81 km and 1.16 km for the primary and secondary, respectively, based on an effective WISE-diameter of 4.95 km and using the lower limit of 0.24 for the secondary-to-primary diameter-ratio (Ds/p) determined by David Higgins. Later observation by Higgins and Pravec determined a Ds/p ratio of 0.30 to 0.32, which increases the satellites size by a quarter to a third if all other factors remain unchanged. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Flora family of 0.24 and calculates a diameter of 5.17 kilometers based on an absolute magnitude of 13.6. References 30em 2018-03-16 last obs. JPL Small-Body Database Browser: 6265 (1985 TW3) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006265 Jet Propulsion Laboratory 26 November 2018 6265 (1985 TW3) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=6265 26 November 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 26 November 2018 Asteroids with Satellites Database – (6265) 1985 TW3 Johnston's Archive 21 September 2014 Johnston Wm. Robert https://www.johnstonsarchive.net/astro/astmoons/am-06265.html 26 November 2018 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 118745497 J. M. Carvano P. H. Hasselmann D. Lazzaro T. Mothé-Diniz February 2010 SDSS-based taxonomic classification and orbital distribution of main belt asteroids https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab Astronomy and Astrophysics 510 12 2010A&A...510A..43C 10.1051/0004-6361/200913322 30 October 2019 free (PDS data set) Asteroid (6265) 1985 TW3 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=6265 26 November 2018 6265 26 November 2018 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri C. Nugent M. S. Cabrera November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 6 A. K. Mainzer J. M. Bauer R. M. Cutri T. Grav E. A. Kramer J. R. Masiero C. R. Nugent S. M. Sonnett R. A. Stevenson E. L. Wright June 2016 NEOWISE Diameters and Albedos V1.0 https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab NASA Planetary Data System 247 EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 2016PDSS..247.....M 26 November 2018 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 (catalog) D. Higgins P. Pravec P. Kusnirak August 2007 (6265) 1985 TW3 http://www.cbat.eps.harvard.edu/iau/cbet/001000/CBET001015.txt Central Bureau Electronic Telegrams 1015 1 2007CBET.1015....1H 26 November 2018 David Higgins Julian Oey Petr Pravec January 2011 Period Determination of Binary Asteroid Targets Observed at Hunters Hill Observatory: May-September 2009 The Minor Planet Bulletin 38 1 46–49 1052-8091 2011MPBu...38...46H Bianchi E. December 1920 Osservazioni fotometriche di pianeti Memorie della Società Astronomia Italiana 2 45 1921MmSAI...2...45B 6 P. Pravec P. Scheirich D. Vokrouhlický A. W. Harris P. Kusnirák K. Hornoch D. P. Pray D. Higgins A. Galád J. Világi S. Gajdos L. Kornos J. Oey M. Husárik W. R. Cooney J. Gross D. Terrell R. Durkee J. Pollock D. E. Reichart K. Ivarsen J. Haislip A. LaCluyze Yu. N. Krugly N. Gaftonyuk R. D. Stephens R. Dyvig V. Reddy V. Chiorny O. Vaduvescu Longa-Peñ P. a A. Tudorica B. D. Warner G. Masi J. Brinsfield Gonç R. alves P. Brown Z. Krzeminski O. Gerashchenko V. Shevchenko I. Molotov F. Marchis March 2012 Binary asteroid population. 2. Anisotropic distribution of orbit poles of small, inner main-belt binaries Icarus 218 1 125–143 2012Icar..218..125P 10.1016/j.icarus.2011.11.026 Oey Julian October 2014 Lightcurve Analysis of Asteroids from Blue Mountains Observatory in 2013 The Minor Planet Bulletin 41 4 276–281 1052-8091 2014MPBu...41..276O 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 8342929 External links 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 Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center 6265 (6264) 1980 SQ 6265 6266 Letzel 006265 006265 19851011