1397 Umtata

Main-belt asteroid October 2019 yes 1397 Umtata #D6D6D6 C. Jackson Johannesburg Obs. 9 August 1936 (1397) Umtata 1936 PG1931 GK1945 QF1945 RC1948 EB 1 Mthatha(South-African town) main-belt(middle)background 4 September 2017 (JD 2458000.5) 0 81.14 yr (29,638 days) 3.3646 AU 1.9967 AU 2.6806 AU 0.2551 4.39 yr (1,603 days) 173.37° 0.2246 ms / day 3.5109° 77.437° 206.53° 20.35 0.30 km20.40 km (derived)20.798 0.292 km22.895 0.285 km 30 h 0.0794 0.01400.084 0.0460.10 (assumed)0.112 0.004 S/CB–V 0.690U–B 0.210 11.4711.57 1397 Umtata, provisional designation 1936 PG, is an asteroid from the background population of the asteroid belt's central region, approximately 21 kilometers in diameter. It was discovered by South-African astronomer Cyril Jackson at the Union Observatory in Johannesburg on 9 August 1936. The asteroid was named after the South-African town of Mthatha, formerly known as Umtata. Orbit and classification Umtata is a non-family asteroid of the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 2.0–3.4 AU once every 4 years and 5 months (1,603 days). Its orbit has an eccentricity of 0.26 and an inclination of 4° with respect to the ecliptic. The asteroid was first identified as 1931 GK at the Lowell Observatory in April 1931. The body's observation arc begins with its official discovery observation at Johannesburg. Physical characteristics The asteroid's spectral type is unknown. The Lightcurve Data Base assumes an S- or C-type to be equally likely, using an average albedo of 0.10 (see below).lcdb-S/C-type Rotation period In May 1984, a rotational lightcurve of Umtata was obtained from photometric observations by American astronomer Richard Binzel. Analysis of the fragmentary lightcurve gave a rotation period of 30 hours with a brightness amplitude of 0.13 magnitude (U=1). As of 2017, no secure period has been obtained. Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Umtata measures between 20.35 and 22.895 kilometers in diameter and its surface has an albedo between 0.0794 and 0.112. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 – a compromise value between the stony (0.20) and carbonaceous asteroid's, both abundant in the main belt's central region – and derives a diameter of 20.40 kilometers based on an absolute magnitude of 11.57. Naming This minor planet was named after South-African town of Mthatha, formerly known as Umtata. It is the capital town of the OR Tambo District Municipality and the King Sabata Dalindyebo Local Municipality. The official 1397 naming citation was published by the Minor Planet Center in April 1953 (M.P.C. 909). Notes lcdb-S/C-type Asteroid Lightcurve Data Base (LCDB) – 2. Taxonomic Class, orbital class, and albedo. The LCDB generically assumes a S/C-type with an albedo of 0.10 for non-family main belt asteroids with a semi-major axis between 2.6 and 2.7. References 30em 2017-10-01 last obs. JPL Small-Body Database Browser: 1397 Umtata (1936 PG) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001397 Jet Propulsion Laboratory 17 October 2017 Dictionary of Minor Planet Names – (1397) Umtata Schmadel Lutz D. Springer Berlin Heidelberg 113 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1398 (1397) Umtata 1397 Umtata (1936 PG) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1397 17 October 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 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 17 October 2017 Asteroid 1397 Umtata – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1397 29 October 2019 1397 17 October 2017 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 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 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 17 October 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/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1397 1396 Outeniqua 1397 1398 Donnera 001397 Category:Discoveries by Cyril Jackson (astronomer) Category:Named minor planets 19360809