1215 Boyer

Stony Eunomian asteroid October 2019 yes 1215 Boyer #D6D6D6 19 January 1932 A. Schmitt Algiers Obs. (1215) Boyer 1932 BA Louis Boyer(French astronomer) main-belt(middle)EunomiaMaria 4 September 2017 (JD 2458000.5) 0 85.46 yr (31,214 days) 2.9213 AU 2.2352 AU 2.5783 AU 0.1331 4.14 yr (1,512 days) 324.91° 0.2381 ms / day 15.915° 123.74° 266.02° 13.041 0.106 km14.705 0.091 km17.47 km (calculated)20.68 0.79 km23.06 4.95 km24.65 0.36 km 10.36 0.05 h 0.116 0.0220.147 0.0130.17 0.080.21 (assumed)0.3012 0.1397 Tholen = SSB–V = 0.900U–B = 0.459 11.0011.111.1411.53 0.15 1215 Boyer, provisional designation 1932 BA, is a stony Eunomian asteroid from the central region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered by astronomer Alfred Schmitt in 1932, who named it after French astronomer and college Louis Boyer. Discovery Boyer was discovered on 19 January 1932, by French astronomer Alfred Schmitt at the Algiers Observatory in Algeria, North Africa. Eight days later, it was independently discovered by Karl Reinmuth at Heidelberg Observatory in Germany. The body's observation arc begins at Algiers with its official discovery observation. Classification and orbit Boyer is a member of the Eunomia family (502), the most prominent family in the intermediate main-belt, which mostly consists of stony asteroids. Conversely, Boyer has also been grouped into the Maria family (506). It orbits the Sun at a distance of 2.2–2.9 AU once every 4 years and 2 months (1,512 days). Its orbit has an eccentricity of 0.13 and an inclination of 16° with respect to the ecliptic. Physical characteristics In the Tholen classification, Boyer is a common, stony S-type asteroid. Lightcurves In August 2008 and May 2012, two rotational lightcurves of Boyer were obtained from photometric observations by an international collaboration of astronomers studying the rotational properties of Maria asteroids, using the ground-based Wise Observatory in Israel. Lightcurve analysis gave a rotation period of 10.36 hours with a brightness variation of 0.31 and 050 magnitude, respectively (U=2-/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, Boyer measures between 13.041 and 24.65 kilometers in diameter and its surface has an albedo between 0.116 and 0.3012. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21, derived from the Eunomia family's largest member and namesake, 15 Eunomia, and calculates a diameter of 17.47 kilometers with an absolute magnitude of 11.1. Naming This minor planet was named by the discoverer after his colleague at Algiers Observatory, Louis Boyer (1901–1999), who worked extensively on asteroids and comets. Boyer himself was a discoverer of minor planets at Algiers. He later worked on identifications at Nice observatory. The official 1215 naming citation was published by the Minor Planet Center on 1 August 1978 (M.P.C. 4418). References 30em 2017-07-05 last obs. JPL Small-Body Database Browser: 1215 Boyer (1932 BA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001215 Jet Propulsion Laboratory 17 August 2017 Dictionary of Minor Planet Names – (1215) Boyer Schmadel Lutz D. Springer Berlin Heidelberg 101 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1216 (1215) Boyer 1215 Boyer (1932 BA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1215 17 August 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 17 August 2017 1215 17 August 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 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 17 August 2017 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 17 August 2017 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 (online, AcuA catalog p. 153) 6 M.-J. Kim Y.-J. Choi H.-K. Moon Y.-I. Byun N. Brosch M. Kaplan S. Kaynar Ö Uysal E. Güzel R. Behrend J.-N. Yoon S. Mottola S. Hellmich T. C. Hinse Z. Eker J.-H. Park March 2014 Rotational Properties of the Maria Asteroid Family The Astronomical Journal 147 3 15 2014AJ....147...56K 10.1088/0004-6256/147/3/56 1311.5318 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 17 August 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 1215 1214 Richilde 1215 1216 Askania 001215 Category:Discoveries by Alfred Schmitt Category:Named minor planets 001215 19320119