1669 Dagmar

Rare-type Themistian asteroid October 2019 yes 1669 Dagmar #D6D6D6 7 September 1934 K. Reinmuth Heidelberg Obs. (1669) Dagmar 1934 RS1943 GE1950 PX1953 AD1957 WA1959 CV1962 RH Generic name(common German name) main-beltThemis 4 September 2017 (JD 2458000.5) 0 82.66 yr (30,190 days) 3.4870 AU 2.7920 AU 3.1395 AU 0.1107 5.56 yr (2,032 days) 126.58° 0.1772 ms / day 0.9409° 18.979° 178.21° 35.78 2.4 km (IRAS:17)42.377 0.188 km42.99 2.86 km43.00 0.77 km45.194 0.620 km 3.98 0.80 16 kg 0.95 0.27 g/cm3 12 h 0.0354 0.00610.039 0.0070.0565 0.008 (IRAS:17) Tholen = G:G:B–V = 0.730U–B = 0.460 10.91 0.1810.97 (IRAS:17)10.97 1669 Dagmar, provisional designation 1934 RS, is a rare-type Themistian asteroid from the outer region of the asteroid belt, approximately 42 kilometers in diameter. It was discovered on 7 September 1934, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after a common German feminine name. Classification and orbit The asteroid is a member of the Themis family, a large group of asteroids in the outer main-belt. It orbits the Sun at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,032 days). Its orbit has an eccentricity of 0.11 and an inclination of 1° with respect to the ecliptic. As no precoveries were taken, and no prior identifications were made, Dagmars observation arc begins with its official discovery observation. Physical characteristics Dagmar has a rare spectra of a G-type asteroid (or Cg-type in the SMASS taxonomy), similar to 1 Ceres, the largest asteroid and only dwarf planet in the asteroid belt. Rotation period Astronomer Federico Manzini obtained a provisional lightcurve of Dagmar from photometric observations in March 2004. It gave a tentative rotation period of 12 hours with a brightness variation of 0.15 magnitude (U=1). As of 2017, no secure period has yet been published. 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, Dagmar measures between 35.78 and 45.194 kilometers in diameter, and its surface has an albedo between 0.035 and 0.057. The Collaborative Asteroid Lightcurve Link adopts the results obtained by 17 observations made by IRAS, that is an albedo of 0.0565 and a diameter of 35.78 kilometers with an absolute magnitude of 10.97. Naming This minor planet was named by the discoverer after a common German feminine name. No special meaning is assigned to this name. The official 1669 naming citation was published by the Minor Planet Center on 15 December 1968 (M.P.C. 2901). References 2017-05-04 last obs. JPL Small-Body Database Browser: 1669 Dagmar (1934 RS) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001669 Jet Propulsion Laboratory 6 June 2017 Dictionary of Minor Planet Names – (1669) Dagmar Schmadel Lutz D. Springer Berlin Heidelberg 133 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1670 (1669) Dagmar 1669 Dagmar (1934 RS) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1669 23 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 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 – (1669) Dagmar Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001669 23 December 2016 1 April 2019 https://web.archive.org/web/20190401181659/http://obswww.unige.ch/~behrend/page4cou.html#001669 dead Carry B. December 2012 Density of asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012P&SS...73...98C Planetary and Space Science 73 1 98–118 2012P&SS...73...98C 10.1016/j.pss.2012.03.009 1203.4336 23 December 2016 1669 23 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 – IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 17 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 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 23 December 2016 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 23 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/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1669 1668 Hanna 1669 1670 Minnaert 001669 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 001669 19340907