1805 Dirikis

Stony main-belt asteroid October 2019 yes 1805 Dirikis #D6D6D6 1805Dirikis (Lightcurve Inversion).png Lightcurve-based 3-D model of Dirikis padding: 5px 0; line-height: 1.3em; 1 April 1970 L. Chernykh Crimean Astrophysical Obs. (1805) Dirikis 1970 GD1942 EJ1948 JH1948 JM1950 TU 11953 EL1955 QL 11959 JP1962 WP1962 XC 11964 FE Matiss Dirikis (astronomer) main-beltThemis 4 September 2017 (JD 2458000.5) 0 66.20 yr (24,178 days) 3.4915 AU 2.7911 AU 3.1413 AU 0.1115 5.57 yr (2,034 days) 235.42° 2.5157° 78.926° 86.389° 22.05 1.37 km25.53 km (derived)25.70 2.7 km27.228 0.251 km28.098 0.238 km 23.0 0.3 h23.4543 h 0.0746 (derived)0.0893 0.00760.095 0.0070.1065 0.0260.145 0.019 S 11.011.4 1805 Dirikis, provisional designation 1970 GD, is a stony Themistian asteroid from the outer region of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 1 April 1970, by Russian astronomer Lyudmila Chernykh at the Crimean Astrophysical Observatory in Nauchnyj on the Crimean peninsula. It was named for Latvian astronomer Matiss Dirikis. Orbit and classification The S-type asteroid is a member of the Themis family, a dynamical population of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,034 days). Its orbit has an eccentricity of 0.11 and an inclination of 3° with respect to the ecliptic. It was first observed at the Finnish Turku Observatory during WWII in 1942. The body's first used observation was its identification as 1955 QL 1 at Goethe Link Observatory in 1955, extending the asteroid's observation arc by 15 years prior to its official discovery observation. Physical characteristics Rotation period A rotational lightcurve of Dirikis was obtained from photometric observations taken by French amateur astronomer René Roy In April 2003. It gave a rotation period of 23.0 hours with a brightness variation of 0.45 magnitude (U=2). A 2013-published period of 23.45 hours was derived in an international study (U=n.a.). 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, Dirikis measures between 22.05 and 28.10 kilometers in diameter, and its surface has an albedo between 0.089 and 0.145. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.075 and calculates a diameter of 25.53 kilometers with an absolute magnitude of 11.4. Naming This minor planet was named for astronomer Matiss A. Dirikis (1923–1993), who was a member of the Astronomical Observatory at the University of Latvia, and chairman of the Latvian branch of the Astronomical–Geodetical Society of the U.S.S.R. His work on the motion of small Solar System bodies also contributed to the field of theoretical astronomy. The official 1805 naming citation was published by the Minor Planet Center on 1 January 1974 (M.P.C. 3569). References 2016-12-25 last obs. JPL Small-Body Database Browser: 1805 Dirikis (1970 GD) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001805 Jet Propulsion Laboratory 3 June 2017 Dictionary of Minor Planet Names – (1805) Dirikis Schmadel Lutz D. Springer Berlin Heidelberg 145 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1806 (1805) Dirikis 1805 Dirikis (1970 GD) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1805 16 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 2009 https://archive.org/details/dictionaryminorp2008schm limited Appendix – Publication Dates of the MPCs Schmadel Lutz D. Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 Asteroids and comets rotation curves – (1805) Dirikis Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001805 16 December 2016 1 April 2019 https://web.archive.org/web/20190401181659/http://obswww.unige.ch/~behrend/page4cou.html#001805 dead 1805 16 December 2016 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 6 J. Hanus M. Broz J. Durech B. D. Warner J. Brinsfield R. Durkee D. Higgins R. A. Koff J. Oey F. Pilcher R. Stephens L. P. Strabla Q. Ulisse R. Girelli November 2013 An anisotropic distribution of spin vectors in asteroid families Astronomy and Astrophysics 559 19 2013A&A...559A.134H 10.1051/0004-6361/201321993 1309.4296 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 16 December 2016 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 1805 1804 Chebotarev 1805 1806 Derice 001805 Category:Discoveries by Lyudmila Chernykh Category:Named minor planets 19700401