1457 Ankara

Stony asteroid from the central region of the asteroid belt October 2019 yes 1457 Ankara #D6D6D6 001457-asteroid shape model (1457) Ankara.png Shape of Ankara modelled from its lightcurve 3 August 1937 K. Reinmuth Heidelberg Obs. (1457) Ankara 1937 PA1933 SA1934 XG1936 FL 11943 YD1966 BG Ankara (Turkish capital) main-belt(middle) 16 February 2017 (JD 2457800.5) 0 82.95 yr (30,296 days) 3.1134 AU 2.2802 AU 2.6968 AU 0.1545 4.43 yr (1,618 days) 63.234° 0.2226 ms / day 6.0913° 296.31° 296.31° 17.834 0.207 km18.495 0.068 km18.95 0.63 km19.82 0.26 km29.08 km (calculated) 31.8 0.6 h 0.1 (assumed)0.258 0.0510.262 0.0080.3038 0.05360.320 0.037 S 10.6010.7010.8 1457 Ankara, provisional designation 1937 PA, is a stony asteroid from the central region of the asteroid belt, approximately 18 kilometers in diameter. It was discovered on 3 August 1937, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany, and later named for the Turkish capital city of Ankara. Orbit and classification Ankara orbits the Sun in the middle of the main belt at a distance of 2.3–3.1 AU once every 4 years and 5 months (1,618 days). Its orbit has an eccentricity of 0.15 and an inclination of 6° with respect to the ecliptic. It was first observed as 1933 SA at Uccle Observatory in 1933, extending the body's observation arc by four years prior to its official discovery observation at Heidelberg. Physical characteristics Rotation period A rotational lightcurve of Ankara was obtained from photometric observations by French amateur astronomer René Roy in September 2004. Lightcurve analysis gave a rotation period of 31.8 hours with a brightness variation of 0.21 magnitude (U=2). While not being a slow rotator, Ankaras spin rate is slower than that of most asteroids, which typically rotate within 20 hours once around their axis. 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, Ankara measures between 17.834 and 19.82 kilometers in diameter and its surface has an albedo between 0.258 and 0.320. The Collaborative Asteroid Lightcurve Link (CALL) assumes a lower albedo of 0.10—a compromise value that lies between the albedos for stony (0.20) and carbonaceous (0.057) asteroids, chosen by CALL for all non-family asteroids with a semi-major axis between 2.6 and 2.7 AU—and consequently calculates a larger diameter of 29.08 kilometers with an absolute magnitude of 10.8, as a body's diameter and albedo are inversely related to each other. Naming This minor planet was named after the Turkish capital Ankara. The official naming citation was proposed by Wolfgang Gleißberg, a German solar astronomer, who immigrated to Turkey, after he was dismissed at the Breslau Observatory in Nazi Germany in 1933, because he had a Jewish grandfather. The citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 1457 131). References 30em JPL Small-Body Database Browser: 1457 Ankara (1937 PA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001457 27 April 2017 Jet Propulsion Laboratory 2016-08-27 last obs. Schmadel Lutz D. Dictionary of Minor Planet Names – (1457) Ankara 2007 Springer Berlin Heidelberg 978-3-540-00238-3 117 (1457) Ankara 10.1007/978-3-540-29925-7_1458 Rieber Angelika Wolfgang Gleissberg – Refuge in Turkey http://www.juedisches-leben-frankfurt.de/english/home/biographies-and-encounters/biographies-g-l/wolfgang-gleissberg.html dead https://web.archive.org/web/20170104100834/http://www.juedisches-leben-frankfurt.de/english/home/biographies-and-encounters/biographies-g-l/wolfgang-gleissberg.html 4 January 2017 27 April 2017 Project Jewish Life in Frankfurt 1457 Ankara (1937 PA) https://www.minorplanetcenter.net/db_search/show_object?object_id=1457 27 April 2017 Minor Planet Center Behrend Raoul Asteroids and comets rotation curves – (1457) Ankara http://obswww.unige.ch/~behrend/page4cou.html#001457 27 April 2017 Geneva Observatory 3 August 2003 https://web.archive.org/web/20030803183423/http://obswww.unige.ch/~behrend/page4cou.html#001457 dead Masiero Joseph R. Grav T. Mainzer A. K. Nugent C. R. Bauer J. M. Stevenson R. Sonnett S. 6 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 1406.6645 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 27 April 2017 1457 27 April 2017 Asteroid Lightcurve Database (LCDB) Usui Fumihiko Kuroda Daisuke Müller Thomas G. Hasegawa Sunao Ishiguro Masateru Ootsubo Takafumi Ishihara Daisuke Kataza Hirokazu Takita Satoshi Oyabu Shinki Ueno Munetaka Matsuhara Hideo Onaka Takashi 6 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) Mainzer A. Grav T. Masiero J. Hand E. Bauer J. Tholen D. McMillan R. S. Spahr T. Cutri R. M. Wright E. Watkins J. Mo W. Maleszewski C. 6 November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 1109.6407 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 Masiero Joseph R. Mainzer A. K. Grav T. Bauer J. M. Cutri R. M. Nugent C. Cabrera M. S. 6 November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M The Astrophysical Journal Letters 759 1 5 1209.5794 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 27 April 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 1457 1456 Saldanha 1457 1458 Mineura 001457 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19370803