1543 Bourgeois

Main-belt asteroid October 2019 yes 1543 Bourgeois #D6D6D6 E. Delporte Uccle Observatory 21 September 1941 (1543) Bourgeois 1941 SJA911 MF Paul Bourgeois(Belgian astronomer) main-belt(middle)background 4 September 2017 (JD 2458000.5) 0 75.81 yr (27,689 days) 3.4854 AU 1.7812 AU 2.6333 AU 0.3236 4.27 yr (1,561 days) 307.06° 0.2307 ms / day 11.021° 287.95° 25.799° 11.985 0.673 km16.73 km (calculated) 2.48 0.01 h 0.1 (assumed)0.214 0.033 S/C (assumed) 11.9012.012.06 0.18 1543 Bourgeois (provisional designation 1941 SJ) is a stony asteroid from the central asteroid belt's background population, approximately 12 kilometers in diameter. It was discovered on 21 September 1941, by astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle. The asteroid was named after Belgian astronomer Paul Bourgeois. Orbit and classification Bourgeois 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 1.8–3.5 AU once every 4 years and 3 months (1,561 days). Its orbit has an eccentricity of 0.32 and an inclination of 11° with respect to the ecliptic. The asteroid was first identified as A911 MF at Johannesburg Observatory in June 1911. The body's observation arc begins at Istanbul Observatory (080), eight days prior to its official discovery observation at Uccle. Physical characteristics No spectral type has been determined. The Lightcurve Data Base considers Bourgeois equally likely to be of a stony or carbonaceous, while albedo measurements by Wide-field Infrared Survey Explorer suggest that it is a stony S-type asteroid (see below). Rotation period In August 2005, a rotational lightcurve of Bourgeois was obtained from photometric observations by French amateur astronomer Laurent Bernasconi. Analysis of the fragmentary lightcurve gave a rotation period of 2.48 hours with a brightness amplitude of 0.03 magnitude (U=1). As of 2017, no secure period has been obtained. Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, Bourgeois measures 11.985 kilometers in diameter and its surface has an albedo of 0.214. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.1 – a compromise albedo between the stony (0.20) and carbonaceous (0.057) types, used as a default for asteroids with a semi-major axis between 2.6 and 2.7 AU – and calculates a diameter of 16.73 kilometers based on an absolute magnitude of 12.0. Naming This minor planet was named in memory of Paul Bourgeois (1898–1974), director of the discovering observatory at Uccle, professor at the Free University of Brussels, credited discoverer of asteroid 1547 Nele, author of various publications in astrometry, astrophysics, meridian astronomy and stellar statistics. The official 1543 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3930). References 30em 2017-07-05 last obs. JPL Small-Body Database Browser: 1543 Bourgeois (1941 SJ) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001543 Jet Propulsion Laboratory 7 October 2017 Dictionary of Minor Planet Names – (1543) Bourgeois Schmadel Lutz D. Springer Berlin Heidelberg 122 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1544 (1543) Bourgeois 1543 Bourgeois (1941 SJ) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1543 7 October 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 Asteroids and comets rotation curves – (1543) Bourgeois Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001543 7 October 2017 1 April 2019 https://web.archive.org/web/20190401181659/http://obswww.unige.ch/~behrend/page4cou.html#001543 dead Asteroid 1543 Bourgeois – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1543 29 October 2019 1543 7 October 2017 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 7 October 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 7 October 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 1543 1542 Schalén 1543 1544 Vinterhansenia 001543 Category:Discoveries by Eugène Joseph Delporte Category:Named minor planets 19410921