1241 Dysona

Asteroid October 2019 yes 1241 Dysona #D6D6D6 1241Dysona (Lightcurve Inversion).png Lightcurve-based 3D-model of Dysona H. E. Wood Johannesburg Obs. 4 March 1932 (1241) Dysona 1932 EB 11931 AA 11945 RA1948 CE1956 PBA908 DCA920 EB Frank Watson Dyson(English astronomer) main-belt(outer)background 4 September 2017 (JD 2458000.5) 0 97.31 yr (35,542 days) 3.5165 AU 2.8633 AU 3.1899 AU 0.1024 5.70 yr (2,081 days) 290.13° 0.1730 ms / day 23.518° 322.27° 320.07° 70.757 0.287 km74.83 28.44 km75.62 0.82 km77.14 0.86 km77.47 26.72 km79.190 0.694 km83.05 4.4 km 8.355 0.001 h8.60738 h8.6080 0.0005 h 0.04 0.050.0425 0.0050.047 0.0030.05 0.050.051 0.0010.051 0.0050.0585 0.0120 Tholen PDCB–V 0.750U–B 0.290 9.459.74 1241 Dysona, provisional designation 1932 EB 1, is a dark background asteroid from the outer regions of the asteroid belt, approximately 77 kilometers in diameter. It was discovered on 4 March 1932, by English astronomer Harry Edwin Wood at the Union Observatory in Johannesburg, South Africa. The asteroid was named after English astronomer Frank Watson Dyson. Orbit and classification Dysona is a non-family asteroid from the main belt's background population. It orbits the Sun in the outer main-belt at a distance of 2.9–3.5 AU once every 5 years and 8 months (2,081 days; semi-major axis of 3.19 AU). Its orbit has an eccentricity of 0.10 and an inclination of 24° with respect to the ecliptic. The asteroid was first observed as A908 DC at Taunton Observatory (803) in February 1908. The body's observation arc begins with its observations as A920 EB at Heidelberg Observatory in March 1920, or 12 years prior to its official discovery observation at Johannesburg. Physical characteristics In the Tholen classification, Dysonas spectral type is ambiguous, closest to a primitive P-type and somewhat similar to a D- and C-type asteroid (PDC). Rotation period and pole In April 2006, a rotational lightcurve of Dysona was obtained by Julian Oey at Leura Observatory (E17) in Australia. Lightcurve analysis gave a rotation period of 8.6080 hours with a brightness variation of 0.24 magnitude (U=3-), superseding photometric observations by Jean-Gabriel Bosch and Laurent Brunetto in October 2010, who measured a period of 8.355 hours and an amplitude of 0.25 magnitude (U=2). In 2016, a modeled lightcurve using data from UAPC, the Palomar Transient Factory survey, and individual observers, gave a concurring period of 8.60738 hours as well an astronomical pole of (125.0°, −68.0°) 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, Dysona measures between 70.757 and 83.05 kilometers in diameter and its surface has an albedo between 0.04 and 0.0585. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0425 and a diameter of 83.05 kilometers based on an absolute magnitude of 9.45. Naming This minor planet was named after English astronomer Frank Watson Dyson (1868–1939), Astronomer Royal of England, director of the Royal Observatory, Greenwich, awarded the Bruce Medal in 1922, and president of the International Astronomical Union from 1928 to 1932. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 114). The lunar crater Dyson was also named in his honor. References 30em 2017-07-01 last obs. JPL Small-Body Database Browser: 1241 Dysona (1932 EB1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001241 Jet Propulsion Laboratory 4 January 2018 Dictionary of Minor Planet Names – (1241) Dysona Schmadel Lutz D. Springer Berlin Heidelberg 103 2003 978-3-540-00238-3 10.1007/978-3-540-29925-7_1242 (1241) Dysona 1241 Dysona (1932 EB1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1241 4 January 2018 Asteroids and comets rotation curves – (1241) Dysona Behrend Raoul Geneva Observatory https://obswww.unige.ch/~behrend/page3cou.html#001241 4 January 2018 https://web.archive.org/web/20200123022615/https://obswww.unige.ch/~behrend/page3cou.html#001241 23 January 2020 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 119293330 Asteroid 1241 Dysona – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1241 29 October 2019 1241 4 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 35447010 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 46350317 4 January 2018 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 free (online, AcuA catalog p. 153) 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 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 4 January 2018 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 Julian Oey J. Vilagi S. Gajdos L. Kornos A. Galad September 2007 Light curve Analysis of 8 Asteroids from Leura and Other Collaborating Observatories http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007MPBu...34...81O The Minor Planet Bulletin 34 3 81–83 1052-8091 2007MPBu...34...81O 4 January 2018 6 J. Hanus J. Durech M. Broz A. Marciniak B. D. Warner F. Pilcher R. Stephens R. Behrend B. Carry D. Capek P. Antonini M. Audejean K. Augustesen E. Barbotin P. Baudouin A. Bayol L. Bernasconi W. Borczyk J.-G. Bosch E. Brochard L. Brunetto S. Casulli A. Cazenave S. Charbonnel B. Christophe F. Colas J. Coloma M. Conjat W. Cooney H. Correira V. Cotrez A. Coupier R. Crippa M. Cristofanelli Ch. Dalmas C. Danavaro C. Demeautis T. Droege R. Durkee N. Esseiva M. Esteban M. Fagas G. Farroni M. Fauvaud S. Fauvaud F. Del Freo L. Garcia S. Geier C. Godon K. Grangeon H. Hamanowa H. Hamanowa N. Heck S. Hellmich D. Higgins R. Hirsch M. Husarik T. Itkonen O. Jade K. Kaminski P. Kankiewicz A. Klotz R. A. Koff A. Kryszczynska T. Kwiatkowski A. Laffont A. Leroy J. Lecacheux Y. Leonie C. Leyrat F. Manzini A. Martin G. Masi D. Matter J. Michalowski M. J. Michalowski T. Michalowski J. Michelet R. Michelsen E. Morelle S. Mottola R. Naves J. Nomen J. Oey W. Ogloza A. Oksanen D. Oszkiewicz Pä ä kkö P. nen M. Paiella H. Pallares J. Paulo M. Pavic B. Payet M. Polinska D. Polishook R. Poncy Y. Revaz C. Rinner M. Rocca A. Roche D. Romeuf R. Roy H. Saguin P. A. Salom S. Sanchez G. Santacana T. Santana-Ros J.-P. Sareyan K. Sobkowiak S. Sposetti D. Starkey R. Stoss J. Strajnic J.-P. Teng B. Trégon A. Vagnozzi F. P. Velichko N. Waelchli K. Wagrez H. Wücher March 2013 Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution Astronomy and Astrophysics 551 16 2013A&A...551A..67H 10.1051/0004-6361/201220701 1301.6943 118627434 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 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1241 1240 Centenaria 1241 1242 Zambesia 001241 Category:Discoveries by Harry Edwin Wood Category:Named minor planets 001241 19320304