1231 Auricula

Carbonaceous background asteroid December 2018 yes 1231 Auricula #D6D6D6 001231-asteroid shape model (1231) Auricula.png Modelled shape of Auricula from its lightcurve K. Reinmuth Heidelberg Obs. 10 October 1931 (1231) Auricula 1931 TE 2 ɔː ˈ r ɪ k j ʊ l əauricula Primula auricula(flowering plant) main-belt(middle)background 27 April 2019 (JD 2458600.5) 0 87.02 yr (31,785 d) 2.8988 AU 2.4388 AU 2.6688 AU 0.0862 4.36 yr (1,593 d) 171.27° 0.2261 ms / day 11.483° 342.04° 245.60° 13.43 4.67 km15.10 3.67 km18.71 0.65 km21.44 0.81 km22.52 1.8 km 3.9816 0.0006 h 0.0660.07980.0890.11 C (SDSS-MOC) 11.6012.212.29 1231 Auricula (prov. designation: 1931 TE 2) is a carbonaceous background asteroid from the central regions of the asteroid belt, approximately 20 km mi off 2 us in diameter. It was discovered on 10 October 1931, by German astronomer Karl Reinmuth at the Heidelberg Observatory. The likely elongated C-type asteroid has a rotation period of 3.98 hours. It was named after the flowering plant auricula and indirectly honors astronomer Gustav Stracke. Orbit and classification Based on recent HCM-analyses, Auricula is a non-family asteroid that belongs to the main belt's background population. On its osculating Keplerian orbital elements, it is located in the Eunomia region (502), where the prominent family of stony asteroids is located. It orbits the Sun in the central main-belt at a distance of 2.4–2.9 AU once every 4 years and 4 months (1,593 days; semi-major axis of 2.67 AU). Its orbit has an eccentricity of 0.09 and an inclination of 11° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Heidelberg in October 1931. Naming This minor planet was named after the yellow flowered Alpine primrose, primula auricula. The official 1231 naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 113). It honors German astronomer and diligent orbit computer Gustav Stracke (1887–1943), who had asked that no asteroid be named after him. The initials of the asteroids 1227 (1227) through (1234), all discovered by Karl Reinmuth, spell out "G. Stracke". In this manner, Reinmuth was able to circumvent Stracke's desire and honor him nevertheless. The asteroid 1019 Strackea was later named after Stracke directly. In the 1990s, astronomer Brian Marsden was also honored by this method, see asteroids 5694 5694 to 5699 5699. The consecutive initial letters of these minor-planet names spell out "MarsdenB". 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). Physical characteristics In the SDSS-based taxonomy, Auricula is a common, carbonaceous C-type asteroid. Rotation period and poles In April 2008, a rotational lightcurve of Auricula was obtained from photometric observations by Colin Bembrick at the Mount Tarana Observatory 431 and other observers from Australia and New Zealand. Lightcurve analysis gave a rotation period of 3.9816 0.0006 hours with a brightness amplitude of 0.75 magnitude (U=3), indicative of a non-spherical, elongated shape. A modeled lightcurve using photometric data from the Lowell Photometric Database was published in 2016. It gave a concurring sidereal period of 3.981580 0.000001 hours, as well as two spin axes at (57.0°, −57.0°) and (225.0°, −85.0°) in ecliptic coordinates (λ, β). Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Auricula measures between 13.43 and 22.52 kilometers in diameter and its surface has an albedo between 0.066 and 0.11. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0465 and a diameter of 22.37 kilometers based on an absolute magnitude of 12.2. References 30em 2018-10-18 last obs. JPL Small-Body Database Browser: 1231 Auricula (1931 TE2) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001231 Jet Propulsion Laboratory 17 December 2018 Dictionary of Minor Planet Names https://archive.org/details/dictionaryminorp00schm limited Schmadel Lutz D. Springer Berlin Heidelberg (1231) Auricula 102 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1232 Dictionary of Minor Planet Names https://archive.org/details/dictionaryminorp00schm limited Schmadel Lutz D. Springer Berlin Heidelberg (1234) Elyna 102–103 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1235 Dictionary of Minor Planet Names https://archive.org/details/dictionaryminorp00schm limited Schmadel Lutz D. Springer Berlin Heidelberg (1054) Forsytia 90 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1055 Dictionary of Minor Planet Names https://archive.org/details/dictionaryminorp00schm limited Schmadel Lutz D. Springer Berlin Heidelberg (5699) Munch 483 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_5391 1231 Auricula (1931 TE2) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1231 17 December 2018 Asteroid (1231) Auricula – Proper elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=1231&pc=1.1.6 14 December 2018 Asteroid 1231 Auricula Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1231+Auricula 17 December 2018 https://web.archive.org/web/20181217062806/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1231+Auricula 17 December 2018 dead E. F. Tedesco P. V. Noah M. Noah S. D. Price October 2004 IRAS Minor Planet Survey V6.0 https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 17 December 2018 J. M. Carvano P. H. Hasselmann D. Lazzaro T. Mothé-Diniz February 2010 SDSS-based taxonomic classification and orbital distribution of main belt asteroids https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab Astronomy and Astrophysics 510 12 2010A&A...510A..43C 10.1051/0004-6361/200913322 30 October 2019 free (PDS data set) 1231 17 December 2018 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 The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 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 The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 6 A. K. Mainzer J. M. Bauer R. M. Cutri T. Grav E. A. Kramer J. R. Masiero C. R. Nugent S. M. Sonnett R. A. Stevenson E. L. Wright June 2016 NEOWISE Diameters and Albedos V1.0 https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab NASA Planetary Data System EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 2016PDSS..247.....M 17 December 2018 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) Colin Bembrick Greg Crawford Bill Allen October 2008 The Rotation Period of 1231 Auricula http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35..185B The Minor Planet Bulletin 35 4 185–186 1052-8091 2008MPBu...35..185B 17 December 2018 J. Durech J. Hanus D. Oszkiewicz R. Vanco March 2016 Asteroid models from the Lowell photometric database http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...587A..48D Astronomy and Astrophysics 587 6 2016A&A...587A..48D 10.1051/0004-6361/201527573 1601.02909 118427201 17 December 2018 External links Lightcurve Database Query (LCDB), at www.minorplanet.info Dictionary of Minor Planet Names, Google books Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1231 1230 Riceia 1231 1232 Cortusa 001231 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19311010