1178 Irmela

Stony asteroid October 2019 yes 1178 Irmela #D6D6D6 13 March 1931 M. F. Wolf Heidelberg Obs. (1178) Irmela 1931 EC1940 GC1962 JD1988 CK 6 Irmela Ruska(wife of Ernst Ruska) main-belt(middle) 16 February 2017 (JD 2457800.5) 0 85.83 yr (31,351 days) 3.1700 AU 2.1916 AU 2.6808 AU 0.1825 4.39 yr (1,603 days) 209.87° 0.2246 ms / day 6.9511° 170.11° 357.21° 17.00 3.43 km17.50 4.91 km17.90 0.57 km19.05 km (derived)19.09 0.8 km (IRAS:15)19.663 0.049 km20.683 0.181 km 11.989 0.001 h19.17 h 0.0503 0.00310.070 0.0060.08 0.030.08 0.070.0838 (derived)0.0916 0.008 (IRAS:15)0.105 0.007 S 11.8111.87 0.3511.9112.14 1178 Irmela, provisional designation 1931 EC, is a stony asteroid from the middle regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 13 March 1931, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany. The asteroid was named after Irmela Ruska, wife of Ernst Ruska. Orbit and classification Irmela orbits the Sun in the central main-belt at a distance of 2.2–3.2 AU once every 4 years and 5 months (1,603 days). Its orbit has an eccentricity of 0.18 and an inclination of 7° with respect to the ecliptic. A first precovery was taken at Lowell Observatory in February 1931, extending the body's observation arc by 3 weeks prior to its official discovery observation at Heidelberg. Physical characteristics Lightcurves In May 1984, a first rotational lightcurve of Irmela was obtained from photometric observations by American astronomer Richard Binzel. Lightcurve analysis gave a rotation period of 19.17 hours with a brightness variation of 0.34 magnitude (U=2). In March 2010, astronomer Robert Stephens obtained another lightcurve at the Center for Solar System Studies, that gave a divergent period of 11.989 hours with an amplitude of 0.40 magnitude (U=2). Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Irmela measures between 17.00 and 20.683 kilometers in diameter and its surface has an albedo between 0.0503 and 0.105. 10μm radiometric data collected from Kitt Peak National Observatory in 1975, gave a diameter estimate of 19 kilometers. The Collaborative Asteroid Lightcurve Link characterizes Irmela as a common S-type asteroid, derives an albedo of 0.0838 and calculates a diameter of 19.05 kilometers with an absolute magnitude of 11.91. Naming This minor planet was named after Irmela Ruska, wife of the inventor of the electron microscope and 1986 Nobelist, the German physicist Ernst Ruska (1906–1988), who shared the Nobel prize with Gerd Binnig and Heinrich Rohrer. The naming was granted by Max Wolf to his colleague August Kopff, himself a prolific discoverer of minor planets. The citation was published by Paul Herget in The Names of the Minor Planets (1178 H 109). References 30em 2016-12-22 last obs. JPL Small-Body Database Browser: 1178 Irmela (1931 EC) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001178 Jet Propulsion Laboratory 2 May 2017 Dictionary of Minor Planet Names – (1178) Irmela Schmadel Lutz D. (1178) Irmela Springer Berlin Heidelberg 99 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1179 1178 Irmela (1931 EC) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1178 2 May 2017 Morrison D. Chapman C. R. Radiometric diameters for an additional 22 asteroids Astrophysical Journal 204 934–939 March 1976 10.1086/154242 1976ApJ...204..934M 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 119293330 1178 2 May 2017 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 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 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 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 Binzel, R. P. October 1987 A photoelectric survey of 130 asteroids Icarus 72 1 135–208 0019-1035 1987Icar...72..135B 10.1016/0019-1035(87)90125-4 Stephens, Robert D. April 2012 Asteroids Observed from GMARS and Santana Observatories: 2011 October- December The Minor Planet Bulletin 39 2 80–82 1052-8091 2012MPBu...39...80S 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 Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 External links Advances in Imaging and Electron Physics https://books.google.com/books?id=Ry0nQRxOz1EC&pg=PA34 95 1996 Academic Press 978-0-08-057761-6 34 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 1178 1177 Gonnessia 1178 1179 Mally 001178 Category:Discoveries by Max Wolf Category:Named minor planets 19310313