1200 Imperatrix

Hygiean asteroid October 2019 yes 1200 Imperatrix #D6D6D6 K. Reinmuth Heidelberg Obs. 14 September 1931 (1200) Imperatrix 1931 RH1929 CX1950 DC 11957 OYA913 ECA915 TLA924 GC ɪ m p ə ˈ r eɪ t r ɪ k simperator empress (in Latin) main-belt(outer)Hygiea 4 September 2017 (JD 2458000.5) 0 101.75 yr (37,165 days) 3.3873 AU 2.7436 AU 3.0654 AU 0.1050 5.37 yr (1,960 days) 114.85° 0.1836 ms / day 4.5935° 204.77° 51.583° 36.00 0.42 km37.36 9.71 km39.39 km (derived)39.52 3.9 km42.006 0.390 km42.777 0.309 km43.64 0.61 km 13.34 0.11 h17.769 0.002 h 0.04 0.040.0545 (derived)0.060 0.0020.0609 0.01180.065 0.0090.0714 0.017 C (assumed) 10.5010.74 0.2810.8010.910.91 1200 Imperatrix (provisional designation 1931 RH) is a carbonaceous Hygiean asteroid from the outer regions of the asteroid belt, approximately 40 km in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 14 September 1931. The asteroid was named after the Latin word for empress. Orbit and classification Imperatrix is a member of the Hygiea family (601), a very large asteroid family named after 10 Hygiea, the main belt's fourth-largest asteroid. 'mperatrix orbits the Sun in the outer main-belt at a distance of 2.7–3.4 AU once every 5 years and 4 months (1,960 days). Its orbit has an eccentricity of 0.11 and an inclination of 5° with respect to the ecliptic. The body's observation arc begins with its first identification as A913 EC at Simeiz Observatory in March 1913, more than 18 years prior to its official discovery observation at Heidelberg. Physical characteristics Imperatrix is an assumed C-type asteroid which is also the overall spectral type of the Hygiea family.23 Rotation period In August 2000, a rotational lightcurve of Imperatrix was obtained from photometric observations at the River Oaks Observatory (915) in Texas. Lightcurve analysis gave a rotation period of 13.34 hours with a brightness variation of 0.23 magnitude (U=2). In September 2011, photometric observations by French amateur astronomers Pierre Antonini and René Roy gave a refined period of 17.769 hours with an amplitude of 0.21 magnitude (U=3). 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, Imperatrix measures between 36.00 and 43.64 kilometers in diameter and its surface has an albedo between 0.04 and 0.0714. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0545 and a diameter of 39.39 kilometers based on an absolute magnitude of 10.8. Four stellar occultation events by 1200 Imperatrix have been observed, all in 2021. Naming This minor planet was named "Imperatrix", which is Latin for empress. The naming was proposed by German ARI-astronomer Gustav Stracke, after whom 1019 Strackea was named. Any specific reference to an occurrence or person is unknown, according to the author of the Dictionary of Minor Planets, Lutz Schmadel and his communications with Ingrid van Houten-Groeneveld, who also worked at Heidelberg). References 30em 2017-07-03 last obs. JPL Small-Body Database Browser: 1200 Imperatrix (1931 RH) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001200 Jet Propulsion Laboratory 26 September 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 100 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1201 (1200) Imperatrix 1200 Imperatrix (1931 RH) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1200 26 September 2017 Asteroids and comets rotation curves – (1200) Imperatrix Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page3cou.html#001200 26 September 2017 23 April 2019 https://web.archive.org/web/20190423121547/http://obswww.unige.ch/~behrend/page3cou.html#001200 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 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 26 September 2017 Asteroid 1200 Imperatrix – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1200+Imperatrix#Asteroid%201200%20ImperatrixEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 https://web.archive.org/web/20201004034009/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1200+Imperatrix#Asteroid%201200%20ImperatrixEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 4 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 1200 26 September 2017 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 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) 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 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 22 October 2019 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 Holliday, B. March 2001 Photometry of Asteroid 191 Kolga and 1200 Imperatrix http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001MPBu...28...13H The Minor Planet Bulletin 28 13 2001MPBu...28...13H 26 September 2017 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 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 1200 1199 Geldonia 1200 1201 Strenua 001200 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 19310914