1355 Magoeba

Hungaria asteroid and a suspected contact-binary October 2019 yes 1355 Magoeba #D6D6D6 30 April 1935 C. Jackson Johannesburg Obs. (1355) Magoeba 1935 HE Magoeba(South African chief) main-beltHungaria 4 September 2017 (JD 2458000.5) 0 81.71 yr (29,843 days) 1.9363 AU 1.7707 AU 1.8535 AU 0.0447 2.52 yr (922 days) 245.86° 0.3906 ms / day 22.827° 225.25° 340.40° 4.276 0.170 km4.828 0.094 km5.96 km (calculated) 2.9712 0.0003 h2.972 0.002 h2.975 0.002 h5.946 0.005 h5.99 0.05 hlightcurve-plot-201131.65 0.05 h32.9 0.1 h 0.267 0.0950.3 (assumed)0.4663 0.08240.582 0.049 Tholen = XMEXB–V = 0.713U–B = 0.255 13.02 0.2213.05 1355 Magoeba, provisional designation 1935 HE, is a Hungaria asteroid and a suspected contact-binary from the innermost regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 30 April 1935, by English-born, South African astronomer Cyril Jackson at the Johannesburg Observatory in South Africa. The asteroid is named for Magoeba, a tribal chief in the South African Transvaal Province. Orbit and classification Magoeba is a member of the Hungaria family, which forms the innermost dense concentration of asteroids in the Solar System. It orbits the Sun in the inner main-belt at a distance of 1.8–1.9 AU once every 2 years and 6 months (922 days). Its orbit has an eccentricity of 0.04 and an inclination of 23° with respect to the ecliptic. The first precovery was taken at Nice Observatory just 3 day prior to its official discovery. The body's observation arc begins at Johannesburg the night after its discovery observation. Physical characteristics Lightcurves Between 2006 and 2014, several rotational lightcurves of Magoeba were obtained by American astronomer Brian Warner at the CS3–Palmer Divide Station (U82) in California. Lightcurve analysis of the photometric observations taken during the asteroid's 2014-apparition gave a rotation period of 2.971 hours with a brightness variation of 0.09 magnitude (U=3).LCDB-lightcure-plots Previously derived periods varied strongly (5.99 and 31.65 hours) with alternative period solutions (U=2-/2/2).lightcurve-plot-2011 The Observation were taken at the Palmer Divide Observatory (716) in Colorado (see video in External links). It is now suspected that this discrepancy might be caused by the presence of an asteroid moon that orbits Magoeba with a period of 15.05 hours. Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Magoeba measures 4.276 and 4.828 kilometers in diameter, and its surface has an albedo of 0.582 and 0.466, respectively, while a polarimetric study of Hungaria asteroids found a lower albedo of 0.267. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 – a compromise value between 0.4 and 0.2, corresponding to the Hungaria asteroids both as family and orbital group – and calculates a diameter of 5.96 kilometers with an absolute magnitude of 13.05. Spectral type In the Tholen taxonomy, Magoeba is an X-type asteroid, which can be further divided into the bright E, the metallic M and the carbonaceous P classes, with similar spectra but very different inferred mineralogies. It has both been classified as an E-type asteroid by the WISE/NEOWISE mission, and as a M-type asteroid by a dedicated spectroscopic survey at the Argentinian Lencito Complex, respectively. Naming This minor planet was named for Magoeba, a native chief of the North Transvaal in South Africa. The official 1355 naming citation was published by the Minor Planet Center in April 1953 (M.P.C. 908). Notes LCDB-lightcure-plots Light-curve plots of (1355) Magoeba from the 2013-observation and from the 2014-observation, published by the Center for Solar System Studies (CS3) in Landers, California. lightcurve-plot-2011 Lightcurve plot of (1355) Magoeba, Palmer Divide Observatory, B. D. Warner (2011) References 2017-01-09 last obs. JPL Small-Body Database Browser: 1355 Magoeba (1935 HE) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001355 Jet Propulsion Laboratory 25 July 2017 Dictionary of Minor Planet Names – (1355) Magoeba Schmadel Lutz D. Springer Berlin Heidelberg 110 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1356 (1355) Magoeba 1355 Magoeba (1935 HE) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1355 13 January 2017 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 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 13 January 2017 1355 13 January 2017 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 Warner, Brian D. March 2007 Asteroid Lightcurve Analysis at the Palmer Divide Observatory - June-September 2006 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007MPBu...34....8W The Minor Planet Bulletin 34 1 8–10 1052-8091 2007MPBu...34....8W 13 January 2017 Warner, Brian D. April 2010 Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 September–December http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...57W The Minor Planet Bulletin 37 2 57–64 1052-8091 2010MPBu...37...57W 13 January 2017 Warner, Brian D. October 2011 Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2011 March - July http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38..190W The Minor Planet Bulletin 38 4 190–195 1052-8091 2011MPBu...38..190W 13 January 2017 Warner, Brian D. October 2013 Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2013 May–June http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..208W The Minor Planet Bulletin 40 4 208–212 1052-8091 2013MPBu...40..208W 13 January 2017 Warner, Brian D. January 2015 A Sextet of Main-belt Binary Asteroid Candidates http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42...60W The Minor Planet Bulletin 42 1 60–66 1052-8091 2015MPBu...42...60W 13 January 2017 R. Gil-Hutton D. Lazzaro P. Benavidez June 2007 Polarimetric observations of Hungaria asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007A&A...468.1109G Astronomy and Astrophysics 468 3 1109–1114 2007A&A...468.1109G 10.1051/0004-6361:20077178 13 January 2017 free 11336/213855 free S. Fornasier B. E. Clark E. Dotto July 2011 Spectroscopic survey of X-type asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011Icar..214..131F Icarus 214 1 131–146 2011Icar..214..131F 10.1016/j.icarus.2011.04.022 1105.3380 13 January 2017 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 13 January 2017 External links 3Kn3s98KRYw The Palmer Divide Observatory: Tour given by Brian Warner (time 4:03 min.) Dynamical evolution of the Hungaria asteroids 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 1355 1354 Botha 1355 1356 Nyanza 001355 Category:Discoveries by Cyril Jackson (astronomer) Category:Named minor planets 001355 19350430 001355