1091 Spiraea

Carbonaceous main-belt asteroid October 2019 yes 1091 Spiraea #D6D6D6 K. Reinmuth Heidelberg Obs. 26 February 1928 (1091) Spiraea 1928 DT1934 CN 11938 UR1964 XH s p aɪ ˈ r iː əspiræa Spiraea(genus of shrubs) main-belt(outer)Cybelebackground 4 September 2017 (JD 2458000.5) 0 89.27 yr (32,606 days) 3.6484 AU 3.2077 AU 3.4281 AU 0.0643 6.35 yr (2,318 days) 110.37° 0.1553 ms / day 1.1554° 80.790° 12.062° 32.78 km (calculated)35.178 0.108 km39.92 17.85 km40.280 0.455 km40.52 0.91 km 7.01 0.43 h 0.05 0.060.057 (assumed)0.0627 0.01060.063 0.0030.091 0.025 C (assumed) 10.6010.70 0.08 (R)10.811.00 0.1411.1511.18 1091 Spiraea, provisional designation 1928 DT, is a carbonaceous Cybele asteroid from the outer regions of the asteroid belt, approximately 36 kilometers in diameter. It was discovered on 26 February 1928, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after Spiraea, a genus of plants. Orbit and classification Spiraea orbits the Sun in the outer main-belt at a distance of 3.2–3.6 AU once every 6 years and 4 months (2,318 days). Its orbit has an eccentricity of 0.06 and an inclination of 1° with respect to the ecliptic. With these orbital parameters, it belongs to the Cybele asteroids, a dynamical group near the 4:7 resonance with Jupiter and named after one of the largest asteroids, 65 Cybele. It is, however, a non-family asteroid from the main belt's background population when applying the hierarchical clustering method (Nesvorny, Novakovic, Knezevic and Milani) to its proper orbital elements. The body's observation arc begins with its identification as 1934 CN 1 at Uccle Observatory in February 1934, almost six years after its official discovery observation at Heidelberg. Physical characteristics Spiraea is an assumed carbonaceous C-type asteroid. Rotation period In December 2014, a fragmentary rotational lightcurve of Spiraea was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 7.01 hours with a brightness amplitude of 0.03 magnitude (U=1+). Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Spiraea measures between 35.178 and 40.52 kilometers in diameter and its surface has an albedo between 0.05 and 0.091. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 32.78 kilometers based on an absolute magnitude of 11.15. Naming This minor planet was named after Spiraea, a genus of shrubs of the rose family (Rosaceae), with small white or pink flowers. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 103). Reinmuth's flowers Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between 1009 (1009) and 1200 (1200). This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants). References 30em 2017-06-04 last obs. JPL Small-Body Database Browser: 1091 Spiraea (1928 DT) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001091 Jet Propulsion Laboratory 26 September 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 93 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1092 (1091) Spiraea Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 90 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1055 (1054) Forsytia 1091 Spiraea (1928 DT) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1091 26 September 2017 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 119293330 26 September 2017 Asteroid 1091 Spiraea – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1091 28 October 2019 1091 26 September 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 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 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 6 Chan-Kao Chang Hsing-Wen Lin Wing-Huen Ip Ip Wing-huen Thomas A. Prince Shrinivas R. Kulkarni David Levitan Russ Laher Jason Surace December 2016 Large Super-fast Rotator Hunting Using the Intermediate Palomar Transient Factory The Astrophysical Journal Supplement Series 227 2 13 2016ApJS..227...20C 10.3847/0067-0049/227/2/20 1608.07910 30387146 free 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 26 September 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 1091 1090 Sumida 1091 1092 Lilium 001091 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19280226