(11474) 1982 SM2

Main-belt asteroid October 2019 yes (11474) 1982 SM 2 #D6D6D6 18 September 1982 H. Debehogne La Silla Obs. (11474) 1982 SM 2 1995 KD main-beltBaptistina 4 September 2017 (JD 2458000.5) 0 32.59 yr (11,905 days) 2.7224 AU 1.8294 AU 2.2759 AU 0.1962 3.43 yr (1,254 days) 76.029° 0.2871 ms / day 5.4069° 348.59° 355.61° 5.71 km (calculated) 1917.2214 2716 h 0.057 (assumed) C 14.493 0.001 (R)14.714.9414.94 0.61 (11474) 1982 SM 2 is a carbonaceous Baptistina asteroid and potentially slow rotator from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 18 September 1982, by Belgian astronomer Henri Debehogne at ESO La Silla Observatory in northern Chile. Orbit and classification The C-type asteroid belongs to the small Baptistina family. It orbits the Sun at a distance of 1.8–2.7 AU once every 3 years and 5 months (1,254 days). Its orbit has an eccentricity of 0.20 and an inclination of 5° with respect to the ecliptic. As no precoveries were taken, and no prior identifications were made, the asteroid's observation arc begins with its official discovery observation. Physical characteristics In September 2013, a rotational lightcurve of this asteroid was obtained from photometric observations in the R-band at the Palomar Transient Factory in California. It gave an exceptionally long rotation period of 1917 hours with a brightness amplitude of 0.04 magnitude (U=1). However, the fragmentary light-curve has received a low quality rating by the Collaborative Asteroid Lightcurve Link (CALL) which means that the result could be completely wrong (also see potentially slow rotator). CALL assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 5.71 kilometers, based on an absolute magnitude of 14.49. Numbering and naming This minor planet was numbered by the Minor Planet Center on 28 September 1999. As of 2018, it has not been named. References 2015-04-23 last obs. JPL Small-Body Database Browser: 11474 (1982 SM2) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011474 Jet Propulsion Laboratory 26 May 2017 11474 (1982 SM2) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=11474 16 December 2016 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 11474 16 December 2016 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 8342929 16 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 16 December 2016 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 (10001)-(15000) – Minor Planet Center 11474 11473 Barbaresco 11474 (11474) 1982 SM 2 11475 Velinský 011474 Category:Discoveries by Henri Debehogne 19820918