1543 Bourgeois
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1543 Bourgeois
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = E. Delporte
| discovery_site = Uccle Obs.
| discovered = 21 September 1941
| mpc_name = (1543) Bourgeois
| alt_names = 1941 SJ{{·}}A911 MF
| pronounced =
| named_after = Paul Bourgeois
{{small|(Belgian astronomer)}}
| mp_category = main-belt{{·}}{{small|(middle)}}
background
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 75.81 yr (27,689 days)
| aphelion = 3.4854 AU
| perihelion = 1.7812 AU
| semimajor = 2.6333 AU
| eccentricity = 0.3236
| period = 4.27 yr (1,561 days)
| mean_anomaly = 307.06°
| mean_motion = {{Deg2DMS|0.2307|sup=ms}} / day
| inclination = 11.021°
| asc_node = 287.95°
| arg_peri = 25.799°
| dimensions = {{val|11.985|0.673}} km
16.73 km {{small|(calculated)}}
| rotation = {{val|2.48|0.01}} h
| albedo = 0.1 {{small|(assumed)}}
{{val|0.214|0.033}}
| spectral_type = S/C {{small|(assumed)}}
| abs_magnitude = 11.90{{·}}12.0{{·}}{{val|12.06|0.18}}
}}
1543 Bourgeois, provisional designation {{mp|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 {{mp|A911 MF}} at Johannesburg Observatory in June 1911. The body's observation arc begins at Istanbul Observatory ({{small|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 ({{small|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 {{MoMP|1543|naming citation}} was published by the Minor Planet Center on 20 February 1976 ({{small|M.P.C. 3930}}).
References
{{reflist|30em|refs=
|type = 2017-07-05 last obs.
|title = JPL Small-Body Database Browser: 1543 Bourgeois (1941 SJ)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001543
|publisher = Jet Propulsion Laboratory
|accessdate = 7 October 2017}}
|title = Dictionary of Minor Planet Names – (1543) Bourgeois
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 122
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1544 |chapter = (1543) Bourgeois }}
|title = 1543 Bourgeois (1941 SJ)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1543
|accessdate = 7 October 2017}}
|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008)
|chapter = Appendix – Publication Dates of the MPCs
|last = Schmadel |first=Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 221
|isbn = 978-3-642-01964-7
|doi = 10.1007/978-3-642-01965-4}}
|title = Asteroids and comets rotation curves – (1543) Bourgeois
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page4cou.html#001543
|accessdate = 7 October 2017}}
|title = Asteroid 1543 Bourgeois – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1543
|access-date= 29 October 2019}}
|title = LCDB Data for (1543) Bourgeois
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1543%7CBourgeois
|accessdate = 7 October 2017}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = C. |last6 = Nugent
|first7 = M. S. |last7 = Cabrera
|date = November 2012
|title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M
|journal = The Astrophysical Journal Letters
|volume = 759
|issue = 1
|page = 5
|bibcode = 2012ApJ...759L...8M
|doi = 10.1088/2041-8205/759/1/L8
|arxiv = 1209.5794
|access-date= 7 October 2017}}
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|access-date= 7 October 2017}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|1543}}
- {{JPL small body}}
{{Minor planets navigator |1542 Schalén |number=1543 |1544 Vinterhansenia}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Bourgeois}}