1100 Arnica

Main-belt asteroid October 2019 yes 1100 Arnica #D6D6D6 K. Reinmuth Heidelberg Obs. 22 September 1928 (1100) Arnica 1928 SD1950 BU1976 MK1979 HEA904 XAA918 RD ˈ ɑːr n ᵻ k əartica Arnica (flowering plant) main-belt(outer)Koronis 4 September 2017 (JD 2458000.5) 0 99.19 yr (36,230 days) 3.0985 AU 2.6991 AU 2.8988 AU 0.0689 4.94 yr (1,803 days) 47.143° 0.1997 ms / day 1.0342° 304.12° 24.241° 16.894 0.243 km17.234 0.122 km17.92 km (calculated) 14.535 0.005 h14.55 0.220 h14.58 0.05 h 0.2389 0.03750.24 (assumed)0.246 0.031 S (assumed) 10.390 0.110 (R)10.77 0.0310.911.0 1100 Arnica ˈ ɑːr n ᵻ k ə, provisional designation 1928 SD, is a Koronian asteroid from the outer regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered by Karl Reinmuth at the Heidelberg Observatory in 1928 and named after the herbaceous plant Arnica (aster; daisy). The asteroid is likely of stony composition and has a rotation period of 14.535 hours. Discovery Arnica was first observed as A904 XA at the Heidelberg-Königstuhl State Observatory in December 1904. It was officially discovered on 22 September 1928, by German astronomer Karl Reinmuth at Heidelberg in southwest Germany. On 14 October 1928, it was independently discovered by astronomers Friedrich Schwassmann and Arthur Wachmann at the Bergedorf Observatory in Hamburg. The Minor Planet Center does not recognize these independent discoverers. Orbit and classification Arnica is a member of the Koronis family (605), an outer belt asteroid family with nearly co-planar elliptical orbits. The family consist of nearly 6,000 known members and is named after its parent body 158 Koronis.23 It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.1 AU once every 4 years and 11 months (1,803 days; semi-major axis of 2.90 AU). Its orbit has an eccentricity of 0.07 and an inclination of 1° with respect to the ecliptic. The body's observation arc begins at Heidelberg in October 1918, almost 10 years prior to its official discovery observation. Close asteroid approaches Arnica occasionally makes close approaches to other main-belt asteroids. It will pass close to 88 Thisbe three times before the year 2200. On 21 February 2043, Arnica will be 0.0487 AU km on from Thisbe. On 31 March 2112, it will be 0.0432 AU km on from Thisbe. Its closest approach to Thisbe will occur on 17 May 2181, when its distance to Thisbe will be 0.0277 AU km on. It will also approach 7 Iris and 16 Psyche, coming within 0.0117 AU km on and 0.0369 AU km on on 28 November 2104 and 16 July 2199, respectively. Physical characteristics Arnica is an assumed stony S-type asteroid, which is also the overall spectral type for members of the Koronis family.23 Rotation period Several rotational lightcurves of Arnica have been obtained from photometric observations since 2003. Analysis of the best-rated lightcurve gave a rotation period of 14.535 hours with a consolidated brightness amplitude between 0.09 and 0.28 magnitude (U=3). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Arnica measures 16.894 and 17.234 kilometers in diameter and its surface has an albedo of 0.246 and 0.2389, respectively. The Collaborative Asteroid Lightcurve Link assumes a stony standard albedo for Koronian asteroids of 0.24 and calculates a diameter of 17.92 kilometers based on an absolute magnitude of 10.9. Naming This minor planet was named after Arnica, a genus of flowering plants in the sunflower family (aster, daisy, composite). 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 2017-11-25 last obs. JPL Small-Body Database Browser: 1100 Arnica (1928 SD) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001100 https://web.archive.org/web/20200918062803/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001100 dead 18 September 2020 Jet Propulsion Laboratory 11 January 2018 Schmadel Lutz D. Dictionary of Minor Planet Names (1100) Arnica Springer Berlin Heidelberg 93 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1101 Schmadel Lutz D. Dictionary of Minor Planet Names (1054) Forsytia Springer Berlin Heidelberg 90 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1055 1100 Arnica (1928 SD) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1100 11 January 2018 Asteroids and comets rotation curves – (1100) Arnica Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page3cou.html#001100 11 January 2018 3 December 2002 https://web.archive.org/web/20021203214643/http://obswww.unige.ch/~behrend/page3cou.html#001100 dead 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 The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 Asteroid 1100 Arnica – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1100+Arnica#Asteroid%201100%20ArnicaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 https://web.archive.org/web/20201003200024/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1100+Arnica#Asteroid%201100%20ArnicaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 3 October 2020 dead D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 1100 11 January 2018 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 Chan-Kao Chang Wing-Huen Ip Ip Wing-huen Hsing-Wen Lin Yu-Chi Cheng Chow-Choong Ngeow Ting-Chang Yang Adam Waszczak Shrinivas R. Kulkarni David Levitan Branimir Sesar Russ Laher Jason Surace Thomas. A. Prince August 2015 Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory The Astrophysical Journal Supplement Series 219 2 19 2015ApJS..219...27C 10.1088/0067-0049/219/2/27 1506.08493 6 Stephen M. Slivan Richard P. Binzel Shaida C. Boroumand Margaret W. Pan Christine M. Simpson James T. Tanabe Rosalinda M. Villastrigo Lesley L. Yen Richard P. Ditteon Donald P. Pray Robert D. Stephens May 2008 Rotation rates in the Koronis family, complete to H≈11.2 Icarus 195 1 226–276 2008Icar..195..226S 10.1016/j.icarus.2007.11.019 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 1100 1099 Figneria 1100 1101 Clematis 001100 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19280922