1242 Zambesia

Main-belt asteroid February 2020 yes 1242 Zambesia #D6D6D6 C. Jackson Johannesburg Obs. 28 April 1932 (1242) Zambesia 1932 HL1947 TE1948 AC1967 EFA908 BF Zambezi basin(southern Africa) main-belt(middle)background 4 September 2017 (JD 2458000.5) 0 109.42 yr (39,966 days) 3.2569 AU 2.2201 AU 2.7385 AU 0.1893 4.53 yr (1,655 days) 139.42° 0.2175 ms / day 10.163° 350.01° 52.968° 42.16 11.24 km47.54 km (derived)47.594 0.347 km47.70 1.6 km52.668 0.952 km53.70 3.05 km62.23 0.79 km72.818 22.99 km 15.72 0.14 hlcdb-Aznar-201617.305 hlcdb-CALL-2011>24 h (poor) 0.0252 0.01840.04 0.010.043 0.0010.045 0.0320.0541 (derived)0.058 0.0100.0581 0.00400.0708 0.005 C (S3OS2) 10.1010.4010.4110.87 1242 Zambesia (prov. designation: 1932 HL) is a dark background asteroid from the central regions of the asteroid belt, approximately 48 km mi off 2 us in diameter. It was discovered on 28 April 1932, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The asteroid was named for the large Zambezi basin in southern Africa. Orbit and classification Zambesia is a non-family asteroid from the main belt's background population. It orbits the Sun in the central main-belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,655 days; semi-major axis of 2.74 AU). Its orbit has an eccentricity of 0.19 and an inclination of 10° with respect to the ecliptic. The asteroid was first observed as A908 BF at Taunton Observatory (803) in January 1908. The body's observation arc begins at the United States Naval Observatory (786) in February 1908, more than 26 years prior to its official discovery observation at Johannesburg. Naming This minor planet was named after the Zambezi river valley, partially part of the former British Central Africa Protectorate. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 114). The large Zambezi basin stretches across modern Angola, Botswana, Mozambique, Namibia, Zambia and Zimbabwe. Physical characteristics In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Zambesia is a common, carbonaceous C-type asteroid. Rotation period In October 2015, a rotational lightcurve of Zambesia was obtained by a group of Spanish astronomers. Lightcurve analysis gave a rotation period of 15.72 hours with a brightness variation of 0.15 magnitude (U=2).lcdb-Aznar-2016 Previous photometric observations gave a divergent period of 17.305 and 24+ hours (U=1/2).lcdb-CALL-2011 Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Zambesia measures between 42.16 and 72.818 kilometers in diameter and its surface has an albedo between 0.0252 and 0.0708. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0541 and a diameter of 47.54 kilometers based on an absolute magnitude of 10.4. Notes lcdb-CALL-2011 Anonymous lightcurve (2011) for (1242) Zambesia: rotation period 17.305 hours with a brightness amplitude of 0.24 mag. Quality code of 2. lcdb-Aznar-2016 Aznar, A.; Garceran, A.C.; Mansego, E.A.; Rodriguez, P.B.; et al. (2016) Minor Planet Bul. 43, 174-181.; rotation period 15.72 0.14 hours with a brightness amplitude of 0.15 0.01 mag. Quality code of 2. References 30em 2017-07-05 last obs. JPL Small-Body Database Browser: 1242 Zambesia (1932 HL) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001242 Jet Propulsion Laboratory 4 January 2018 Dictionary of Minor Planet Names – (1242) Zambesia Schmadel Lutz D. Springer Berlin Heidelberg 103 2003 978-3-540-00238-3 10.1007/978-3-540-29925-7_1243 (1242) Zambesia 1242 Zambesia (1932 HL) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1242 4 January 2018 Asteroids and comets rotation curves – (1242) Zambesia Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page3cou.html#001242 4 January 2018 23 April 2019 https://web.archive.org/web/20190423121547/http://obswww.unige.ch/~behrend/page3cou.html#001242 dead 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 1242 Zambesia – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1242 29 October 2019 1242 4 January 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 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 4 January 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 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 22 October 2019 6 Joseph R. Masiero C. Nugent A. K. Mainzer E. L. Wright J. M. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett October 2017 NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos The Astronomical Journal 154 4 10 2017AJ....154..168M 10.3847/1538-3881/aa89ec 1708.09504 free 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 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 free 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 10 February 2020 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 1242 1241 Dysona 1242 1243 Pamela 001242 Category:Discoveries by Cyril Jackson (astronomer) Category:Named minor planets 19320428