1585 Union

Dark background asteroid October 2019 yes 1585 Union #D6D6D6 E. L. Johnson Union Obs. 7 September 1947 (1585) Union 1947 RG1929 DB1937 QF1939 CD 11944 DG1949 EE1952 QA 11952 SD Union Observatory(aka Johannesburg Obs.) main-belt(outer) 4 September 2017 (JD 2458000.5) 0 78.37 yr (28,624 days) 3.8332 AU 2.0231 AU 2.9281 AU 0.3091 5.01 yr (1,830 days) 304.39° 0.1967 ms / day 26.187° 150.10° 264.54° 49.01 18.07 km50.42 1.6 km50.68 0.88 km55.271 0.243 km55.42 18.20 km56.014 0.292 km 9.38 h24 h (fragmentary) 0.0304 0.00280.031 0.0040.0378 0.0030.038 0.0010.04 0.040.05 0.02 PCB–V 0.590U–B 0.290 10.33 0.2210.3510.6610.67 1585 Union, provisional designation 1947 RG, is a dark background asteroid from the outer regions of the asteroid belt, approximately 52 kilometers in diameter. It was discovered on 7 September 1947, by South African astronomer Ernest Johnson at the Union Observatory in Johannesburg, South Africa. The asteroid was named after the discovering observatory. Orbit and classification Union is not a member of any known asteroid family. It orbits the Sun in the outer main belt at a distance of 2.0–3.8 AU once every 5.01 years (1,830 days). Its orbit has an eccentricity of 0.31 and an inclination of 26° with respect to the ecliptic. In 1929, the asteroid was first identified as 1929 DB at the Uccle Observatory in Belgium. The body's observation arc begins at the Finnish Turku Observatory in February 1939, more than 17 years prior to its official discovery observation at Johannesburg. Physical characteristics Union has been characterized as a P-type asteroid by the Wide-field Infrared Survey Explorer (WISE), while the LCDB assumes a generic carbonaceous C-type. Rotation period In March 1984, a rotational lightcurve of Union was obtained from photometric observations by American astronomer Richard Binzel. Lightcurve analysis gave a rotation period of 9.38 hours with a brightness variation of 0.22 magnitude (U=2). In addition, a fragmentary lightcurve with a period of 24 hours was obtained by French amateur astronomer Laurent Bernasconi in 2004 (U=1). 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 WISE telescope, Union measures between 49.01 and 56.014 kilometers in diameter and its surface has an albedo between 0.0304 and 0.05. The Collaborative Asteroid Lightcurve Link adopt the results obtained by IRAS, that is, an albedo of 0.0378 and a diameter of 50.42 kilometers. CALL also takes an absolute magnitude of 10.67 from Richard Binzel. Naming This minor planet was named after the discovering Union Observatory, also known as the Johannesburg Observatory, Transvaal Observatory (1909–1912) and Republic Observatory (1961–1971). The official 1585 naming citation was published by the Minor Planet Center in June 1953 (M.P.C. 941). References 30em 2017-07-05 last obs. JPL Small-Body Database Browser: 1585 Union (1947 RG) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001585 Jet Propulsion Laboratory 30 August 2017 Dictionary of Minor Planet Names – (1585) Union Schmadel Lutz D. Springer Berlin Heidelberg 125 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1586 (1585) Union 1585 Union (1947 RG) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1585 30 August 2017 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 2009 https://archive.org/details/dictionaryminorp2008schm limited Appendix – Publication Dates of the MPCs Schmadel Lutz D. Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 2009dmpn.book.....S Asteroids and comets rotation curves – (1585) Union Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001585 30 August 2017 1 April 2019 https://web.archive.org/web/20190401181659/http://obswww.unige.ch/~behrend/page4cou.html#001585 dead 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 119293330 30 August 2017 1585 30 August 2017 6 C. R. Nugent A. Mainzer J. Masiero J. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett R. Stevenson E. L. Wright December 2015 NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 30 August 2017 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 free 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) 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 2004PDSS...12.....T 17 October 2019 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 35447010 Binzel, R. P. October 1987 A photoelectric survey of 130 asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987Icar...72..135B Icarus 72 1 135–208 0019-1035 1987Icar...72..135B 10.1016/0019-1035(87)90125-4 30 August 2017 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 30 August 2017 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 Asteroids and comets rotation curves, CdR https://web.archive.org/web/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1585 1584 Fuji 1585 1586 Thiele 001585 Category:Discoveries by Ernest Leonard Johnson Category:Named minor planets 19470907