1731 Smuts

Main-belt asteroid October 2019 yes 1731 Smuts #D6D6D6 9 August 1948 E. Johnson Johannesburg Obs. (1731) Smuts 1948 PH1926 TF1931 QA1935 FS1938 YB1941 KG1947 LC1948 PP1954 SX1960 WE1966 UY Jan Smuts(Field Marshal; PM) main-belt(outer) 4 September 2017 (JD 2458000.5) 0 90.22 yr (32,954 days) 3.5712 AU 2.7652 AU 3.1682 AU 0.1272 5.64 yr (2,060 days) 41.052° 0.1748 ms / day 5.9328° 152.48° 203.73° 53.83 km (derived)54.71 0.98 km54.784 0.23657.491 0.432 km 12.5 0.7 h 0.0385 (derived)0.0534 0.00600.058 0.0100.059 0.003 C 10.0010.5 1731 Smuts, provisional designation 1948 PH, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 54 kilometers in diameter. It was discovered on 9 August 1948, by South African astronomer Ernest Johnson at Johannesburg Observatory in South Africa, who named it after Field marshal Jan Smuts. Classification and orbit Smuts orbits the Sun in the outer main-belt at a distance of 2.8–3.6 AU once every 5 years and 8 months (2,060 days). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic. First identified as 1926 TF in Heidelberg, Smutss first used observation was taken one month later in November 1926, extending the body's observation arc by 22 years prior to its official discovery observation. Physical characteristics Smuts has been characterized as a carbonaceous C-type asteroid. Rotation period In March 2008, a rotational lightcurve of Smuts was obtained from photometric observations by French amateur astronomer René Roy. It gave a rotation period of 12.5 hours with a brightness variation of 0.8 magnitude (U=2). Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Smuts measures between 54.71 and 57.49 kilometers in diameter, and its surface has an albedo between 0.053 and 0.059. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0385 and a diameter of 53.83 kilometers based on an absolute magnitude of 10.5. Naming This minor planet was named after prominent South African and British Commonwealth statesman, Field Marshal and philosopher, Jan Smuts (1870–1950), under whom the discoverer of the asteroid fought in both World Wars. Smuts captured German South-West Africa in World War I and 0.0385 the only man to sign both of the peace treaties ending the First and Second World Wars. He served as prime minister of South Africa from 1919 until 1924 and again from 1939 until 1948. The official 1731 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3933). References 30em 2016-12-25 last obs. JPL Small-Body Database Browser: 1731 Smuts (1948 PH) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001731 Jet Propulsion Laboratory 7 June 2017 Dictionary of Minor Planet Names – (1731) Smuts Schmadel Lutz D. Springer Berlin Heidelberg 137 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1732 (1731) Smuts 1731 Smuts (1948 PH) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1731 21 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 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 Asteroids and comets rotation curves – (1731) Smuts Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001731 21 December 2016 1 April 2019 https://web.archive.org/web/20190401181659/http://obswww.unige.ch/~behrend/page4cou.html#001731 dead 1731 21 December 2016 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) 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 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 The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 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 1731 1730 Marceline 1731 1732 Heike 001731 Category:Discoveries by Ernest Leonard Johnson Category:Named minor planets 19480809