1193 Africa

Main-belt asteroid October 2019 yes 1193 Africa #D6D6D6 24 April 1931 C. Jackson Johannesburg Obs. (1193) Africa 1931 HB Africa (continent) main-belt(middle)Eunomia 4 September 2017 (JD 2458000.5) 0 86.20 yr (31,484 days) 2.9728 AU 2.3198 AU 2.6463 AU 0.1234 4.30 yr (1,572 days) 9.0113° 0.2290 ms / day 14.141° 49.538° 183.92° 12.220 0.102 km13 km (est. at 0.21) 0.21 (derived)0.247 0.038 S(derived) 11.8 1193 Africa, provisional designation 1931 HB, is a stony Eunomian asteroid from the central region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered by South African astronomer Cyril Jackson at Johannesburg Observatory on 24 April 1931. The asteroid was named for the African continent. Orbit and classification Africa is a member of the Eunomia family (502), a large group of typically S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.3–3.0 AU once every 4 years and 4 months (1,572 days). Its orbit has an eccentricity of 0.12 and an inclination of 14° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Johannesburg. Physical characteristics Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Africa measures 12.22 kilometers in diameter and its surface has an albedo of 0.247. Based on a generic magnitude-to-diameter conversion, Africa measures 13 kilometers in diameter, using an absolute magnitude of 11.8 and a standard albedo for Eunomian asteroids of 0.21, derived from 15 Eunomia, the family's largest member and namesake. Photometry As of 2017, no rotational lightcurve of Africa has been obtained from photometric observations. The body's rotation period, poles and shape still remain unknown. Naming This minor planet was named for Africa, the large continent on which Johannesburg is located. The official naming citation was also mentioned in Paul Herget's The Names of the Minor Planets in 1955 (H 111). References 30em 2017-07-05 last obs. JPL Small-Body Database Browser: 1193 Africa (1931 HB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001193 Jet Propulsion Laboratory 15 August 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 100 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1194 (1193) Africa 1193 Africa (1931 HB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1193 15 August 2017 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 15 August 2017 D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 978-0-8165-3213-1 Asteroid 1193 Africa – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1193+Africa#Asteroid%201193%20AfricaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 October 2026 InternetArchiveBot Asteroid Size Estimator CNEOS/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 2 August 2017 1193 15 August 2017 External links 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 1193 1192 Prisma 1193 1194 Aletta 001193 Category:Discoveries by Cyril Jackson (astronomer) Category:Named minor planets 19310424