1991 Darwin

Stony main-belt asteroid October 2019 yes 1991 Darwin #D6D6D6 6 May 1967 C. U. CescoA. R. Klemola El Leoncito(Yale–Columbia Southern Station) Félix Aguilar Obs. (1991) Darwin 1967 JL1954 UG1971 SU 2 Charles DarwinGeorge Darwin main-beltFlora 4 September 2017 (JD 2458000.5) 0 62.44 yr (22,807 days) 2.7157 AU 1.7829 AU 2.2493 AU 0.2073 3.37 yr (1,232 days) 278.54° 0.2922 ms / day 5.9148° 328.45° 345.52° 4.989 0.371 km5.02 km (taken)5.024 km5.84 1.26 km6.32 1.28 km 4.7 0.2 h 0.16 0.060.25410.258 0.0780.28 0.15 S 13.20 0.3213.413.613.60 0.0713.86 1991 Darwin, provisional designation 1967 JL, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 5 kilometres in diameter. It was discovered on 6 May 1967, by Argentine astronomers Carlos Cesco and Arnold Klemola at the El Leoncito Yale–Columbia Southern Station of the Félix Aguilar Observatory in Argentina. It was named after both George and Charles Darwin. Classification and orbit Darwin is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,232 days). Its orbit has an eccentricity of 0.21 and an inclination of 6° with respect to the ecliptic. It was first observed as 1954 UG at Goethe Link Observatory in 1954, extending the body's observation arc by 13 years prior to its official discovery observation at El Lenoncito. Physical characteristics Darwin has been characterized as a common stony S-type asteroid based on its classification to the Flora family. Rotation period In September 1991, a rotational lightcurve of Darwin was obtained from photometric observations by Polish astronomer Wiesław Wiśniewski. Lightcurve analysis gave a rotation period of 4.7 hours with a brightness amplitude of 0.08 magnitude (U=2). Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Darwin measures between 4.989 and 6.32 kilometres in diameter and its surface has an albedo between 0.16 and 0.28. The Collaborative Asteroid Lightcurve Link adopts Pravec's revised WISE data, that is, an albedo of 0.2541 and a diameter of 5.02 kilometres with an absolute magnitude of 13.6. Naming This minor planet was named in memory of English naturalist Charles Darwin (1809–1882), the first to establish the theory of evolution by natural selection. While on research in Argentina, he crossed the Andes relatively near to the Leoncito Astronomical Complex where the minor planet was discovered. The asteroid also honours George Darwin (1845–1912), his second son who was a noted astronomer for his pioneering application of detailed dynamical analyses to problems of cosmogony and geology. The Darwins are also honoured by the lunar and Martian craters Darwin. The official naming citation was published by the Minor Planet Center on 1 April 1980 (M.P.C. 5282). References 30em 2017-03-30 last obs. JPL Small-Body Database Browser: 1991 Darwin (1967 JL) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001991 Jet Propulsion Laboratory 10 June 2017 Dictionary of Minor Planet Names – (1991) Darwin Schmadel Lutz D. Springer Berlin Heidelberg 161 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1992 (1991) Darwin 1991 Darwin (1967 JL) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1991 8 December 2016 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 8 December 2016 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 118745497 8 December 2016 1991 8 December 2016 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 Petr Pravec Alan W. Harris Peter Kusnirák Adrián Galád Kamil Hornoch September 2012 Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P Icarus 221 1 365–387 2012Icar..221..365P 10.1016/j.icarus.2012.07.026 8 December 2016 W. Z. Wisniewski T. M. Michalowski A. W. Harris R. S. McMillan March 1995 Photoelectric Observations of 125 Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995LPI....26.1511W Abstracts of the Lunar and Planetary Science Conference 26 1511 1995LPI....26.1511W 8 December 2016 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 53493339 8 December 2016 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 10 June 2017 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 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 1991 1990 Pilcher 1991 1992 Galvarino 001991 Category:Discoveries by Carlos Ulrrico Cesco Category:Discoveries by Arnold Klemola Category:Named minor planets 001991 19670506