1246 Chaka

Main-belt asteroid December 2018 yes 1246 Chaka #D6D6D6 C. Jackson Johannesburg Obs. 23 July 1932 (1246) Chaka 1932 OA Shaka (King of the Zulus) main-belt(middle)background 27 April 2019 (JD 2458600.5) 0 86.29 yr (31,519 d) 3.4329 AU 1.8068 AU 2.6198 AU 0.3103 4.24 yr (1,549 d) 128.91° 0.2324 ms / day 16.004° 290.52° 54.847° 17.634 0.498 km17.73 3.89 km18.11 0.9 km19.596 0.035 km20.84 1.39 km 25.462 0.001 hlcdb-Garlitz-2013 0.1950.20450.23510.260.310 A (S3OS2-TH)Sl (S3OS2-BB) 10.810.9 1246 Chaka, provisional designation 1932 OA, is a background asteroid from the central regions of the asteroid belt, approximately 18 km mi off 2 us in diameter. It was discovered on 23 July 1932, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The uncommon A/Sl-type asteroid has a longer than average rotation period of 25.5 hours. It was named for the Zulu King Shaka. Orbit and classification Chaka is a non-family asteroid from the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 1.8–3.4 AU once every 4 years and 3 months (1,549 days; semi-major axis of 2.62 AU). Its orbit has an eccentricity of 0.31 and an inclination of 16° with respect to the ecliptic. The body's observation arc begins with its first observation at Johannesburg on 4 July 1932, three weeks prior to its official discovery observation. Naming This minor planet was named after Shaka (c.1787–1828), also Chaka or Tchaka, founder and one of the most influential monarchs of the Zulu Kingdom. The official 1246 naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 115). Physical characteristics Chaka spectral type has been determined during the Small Solar System Objects Spectroscopic Survey (S3OS2). In the Tholen-like taxonomic variant of the survey, the asteroid is a rare A-type, while in the SMASS-like variant it is a Sl-subtype, that transitions between the common S- and uncommon L-type asteroids. Rotation period In October 2013, a rotational lightcurve of Chaka was obtained from photometric observations by Joe Garlitz at his Elgin Observatory. Lightcurve analysis gave a well-defined rotation period of 25.462 0.001 hours with a brightness amplitude of 0.18 magnitude (U=3).lcdb-Garlitz-2013 Other period determinations were made by European astronomers (20 h; Δ0.2) at OHP and La Silla in October 1996 (U=2), and by Andrea Ferrero (25.44 h; Δ0.25) at the Italian Bigmuskie Observatory B88 in November 2013 (U=2). Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Chaka measures between 17.63 and 20.84 kilometers in diameter and its surface has an albedo between 0.195 and 0.310. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.2351 and a diameter of 18.11 kilometers based on an absolute magnitude of 10.9. Notes lcdb-Garlitz-2013 Joe Garlitz (2013; web) observations of (1246) Chaka at the Elgin Observatory from October 2013. Posted data on the web site of the Collaborative Asteroid Lightcurve Link. Results: rotation period of 25.462 0.001 hours with a brightness amplitude of 0.18 0.02 mag. Quality code is 3. Summary figures at the LCDB. Also see Observers homepage. References 30em 2018-10-20 last obs. JPL Small-Body Database Browser: 1246 Chaka (1932 OA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001246 Jet Propulsion Laboratory 14 December 2018 Dictionary of Minor Planet Names – (1246) Chaka Schmadel Lutz D. Springer Berlin Heidelberg 115 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1247 (1246) Chaka 1246 Chaka (1932 OA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1246 14 December 2018 D. Lazzaro C. A. Angeli J. M. Carvano T. Mothé-Diniz R. Duffard M. Florczak November 2004 S3OS2: the visible spectroscopic survey of 820 asteroids http://sirrah.troja.mff.cuni.cz/yarko-site/tmp/eos/NEW/spectral_type_figure/s3os2.pdf Icarus 172 1 179–220 2004Icar..172..179L 10.1016/j.icarus.2004.06.006 14 December 2018 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 119293330 Asteroid (1246) Chaka AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=1246&pc=1.1.6 14 December 2018 Asteroid 1246 Chaka Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1246+Chaka 14 December 2018 1246 14 December 2018 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri C. Nugent M. S. Cabrera November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 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 The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 6 A. K. Mainzer J. M. Bauer R. M. Cutri T. Grav E. A. Kramer J. R. Masiero C. R. Nugent S. M. Sonnett R. A. Stevenson E. L. Wright June 2016 NEOWISE Diameters and Albedos V1.0 https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab NASA Planetary Data System EAR–A–COMPIL–5–NEOWISEDIAM–V1.0 2016PDSS..247.....M 14 December 2018 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 IRAS–A–FPA–3–RDR–IMPS–V6.0 2004PDSS...12.....T 14 December 2018 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 (catalog) 6 M. Florczak E. Dotto M. A. Barucci M. Birlan A. Erikson M. Fulchignoni A. Nathues L. Perret P. Thebault November 1997 Rotational properties of main belt asteroids: photoelectric and CCD observations of 15 objects Planetary and Space Science 45 11 1423–1435 1997P&SS...45.1423F 10.1016/S0032-0633(97)00121-9 Ferrero, Andrea July 2014 Period Determination of Six Main Belt Asteroids The Minor Planet Bulletin 41 3 184–185 1052-8091 2014MPBu...41..184F External links Elgin Observatory, Backyard Amateur Astromomy 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 Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1246 1245 Calvinia 1246 1247 Memoria 001246 Category:Discoveries by Cyril Jackson (astronomer) Category:Named minor planets 19320723