1621 Druzhba

Asteroid October 2019 yes 1621 Druzhba #D6D6D6 001621-asteroid shape model (1621) Druzhba.png Shape model of Druzhba from its lightcurve 1 October 1926 S. Belyavskyj Simeiz Obs. (1621) Druzhba 1926 TM1927 AE1931 EO1946 UH1949 QS 11951 EK 11951 ER 11958 GA1979 QP 4 дружба – lit. friendship(in Russian) main-beltFlora 4 September 2017 (JD 2458000.5) 0 90.49 yr (33,052 days) 2.4948 AU 1.9650 AU 2.2299 AU 0.1188 3.33 yr (1,216 days) 73.187° 0.2960 ms / day 3.1730° 181.88° 238.14° 9.05 km (derived)9.08 0.8 km11.70 0.20 km12.694 0.296 km 12 h (dated)47.9 0.5 h (dated)99.100 0.005 h99.20 0.03 h 0.2373 0.0460.243 (derived)0.244 0.0390.312 0.012 Tholen = SSB–V = 0.898U–B = 0.503 11.6312.37 0.0912.3912.53 0.29 1621 Druzhba (provisional designation 1926 TM), is a stony Florian asteroid and relatively slow rotator from the inner regions of the asteroid belt, approximately 10 km in diameter. It was discovered on 1 October 1926, by Russian astronomer Sergey Belyavsky at Simeiz Observatory on the Crimean peninsula. It was named after the Russian word for friendship. Classification and orbit Druzhba is a member of the Flora family, one of the largest collisional groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,216 days). Its orbit has an eccentricity of 0.12 and an inclination of 3° with respect to the ecliptic. Druzhba's observation arc begins at the discovering observatory, one week after its official discovery observation. Physical characteristics In the Tholen classification, Druzhba is a common S-type asteroid. Rotation period In August 2009, American amateur astronomer Robert D. Stephens obtained a rotational lightcurve of Druzhba from photometric observations. In gave a well-defined rotation period of 99.20 hours with a change in brightness of 0.75 magnitude (U=3) A 2016-published modeled light-curve of 99.100 hours concurred with the result. This makes it a relatively slow rotator, as the vast majority of minor planets rotate every 2 to 20 hours around their axis. Druzhba's long rotation period was particularly difficulty to measure: Previously, observations by Richard Ditteon at Oakley Observatory gave a period solution of 47.9 hours (Δmag 1.0; U=1), while Polish astronomer Wiesław Wiśniewski obtained a period of only 12 hours in the late 1980s (Δmag 0.16; U=1). 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, Druzhba measures between 9.08 and 12.69 km in diameter, and its surface has an albedo between 0.237 and 0.312. Based on an absolute magnitude of 12.37, the Collaborative Asteroid Lightcurve Link derives a diameter of 9.05 km and an albedo of 0.243 – similar to the albedo of 8 Flora, the family's largest member and namesake. Naming This minor planet was named Druzhba, this is a Slavic word for friendship and the name of several cities, towns and other localities in Russia, Ukraine, Bulgaria and Kazakhstan. The asteroid's name was proposed by the Institute of Theoretical Astronomy in St. Petersburg. The official 1621 naming citation was published by the Minor Planet Center on 1 June 1967 (M.P.C. 2740). References 2017-03-29 last obs. JPL Small-Body Database Browser: 1621 Druzhba (1926 TM) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001621 Jet Propulsion Laboratory 4 June 2017 Dictionary of Minor Planet Names – (1621) Druzhba Schmadel Lutz D. Springer Berlin Heidelberg 128 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1622 (1621) Druzhba 1621 Druzhba (1926 TM) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1621 28 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 1621 28 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 free (online, AcuA catalog p. 153) 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 28 December 2016 W. Z. Wisniewski T. M. Michalowski A. W. Harris R. S. McMillan March 1995 Photoelectric Observations of 125 Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995LPI....26.1511W Abstracts of the Lunar and Planetary Science Conference 26 1511 1995LPI....26.1511W 28 December 2016 Richard Ditteon Scot Hawkins September 2007 Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007MPBu...34...59D The Minor Planet Bulletin 34 3 59–64 1052-8091 2007MPBu...34...59D 28 December 2016 Stephens, Robert D. January 2010 Asteroids Observed from GMARS and Santana Observatories: 2009 June - September http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...28S The Minor Planet Bulletin 37 1 28–29 1052-8091 2010MPBu...37...28S 28 December 2016 6 J. Hanus J. Durech D. A. Oszkiewicz R. Behrend B. Carry M. Delbo O. Adam V. Afonina R. Anquetin P. Antonini L. Arnold M. Audejean P. Aurard M. Bachschmidt B. Baduel E. Barbotin P. Barroy P. Baudouin L. Berard N. Berger L. Bernasconi J.-G. Bosch S. Bouley I. Bozhinova J. Brinsfield L. Brunetto G. Canaud J. Caron F. Carrier G. Casalnuovo S. Casulli M. Cerda L. Chalamet S. Charbonnel B. Chinaglia A. Cikota F. Colas J.-F. Coliac A. Collet J. Coloma M. Conjat E. Conseil R. Costa R. Crippa M. Cristofanelli Y. Damerdji Debackè A. re A. Decock Q. Déhais T. Déléage S. Delmelle C. Demeautis M. Drózdz G. Dubos T. Dulcamara M. Dumont R. Durkee R. Dymock A. Escalante del Valle N. Esseiva R. Esseiva M. Esteban T. Fauchez M. Fauerbach M. Fauvaud S. Fauvaud E. Forné C. Fournel D. Fradet J. Garlitz O. Gerteis C. Gillier M. Gillon R. Giraud J.-P. Godard R. Goncalves Hiroko Hamanowa Hiromi Hamanowa K. Hay S. Hellmich S. Heterier D. Higgins R. Hirsch G. Hodosan M. Hren A. Hygate N. Innocent H. Jacquinot S. Jawahar E. Jehin L. Jerosimic A. Klotz W. Koff P. Korlevic E. Kosturkiewicz P. Krafft Y. Krugly F. Kugel O. Labrevoir J. Lecacheux M. Lehký A. Leroy B. Lesquerbault M. J. Lopez-Gonzales M. Lutz B. Mallecot J. Manfroid F. Manzini A. Marciniak A. Martin B. Modave R. Montaigut J. Montier E. Morelle B. Morton S. Mottola R. Naves J. Nomen J. Oey W. Ogloza M. Paiella H. Pallares A. Peyrot F. Pilcher J.-F. Pirenne P. Piron M. Polinska M. Polotto R. Poncy J. P. Previt F. Reignier D. Renauld D. Ricci F. Richard C. Rinner V. Risoldi D. Robilliard D. Romeuf G. Rousseau R. Roy J. Ruthroff P. A. Salom L. Salvador S. Sanchez T. Santana-Ros A. Scholz G. Séné B. Skiff K. Sobkowiak P. Sogorb F. Soldán A. Spiridakis E. Splanska S. Sposetti D. Starkey R. Stephens A. Stiepen R. Stoss J. Strajnic J.-P. Teng G. Tumolo A. Vagnozzi B. Vanoutryve J. M. Vugnon B. D. Warner M. Waucomont O. Wertz M. Winiarski M. Wolf February 2016 New and updated convex shape models of asteroids based on optical data from a large collaboration network Astronomy and Astrophysics 586 24 2016A&A...586A.108H 10.1051/0004-6361/201527441 1510.07422 Petr Pravec Alan W. Harris Peter Kusnirák Adrián Galád Kamil Hornoch September 2012 Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P Icarus 221 1 365–387 2012Icar..221..365P 10.1016/j.icarus.2012.07.026 28 December 2016 11104/0217021 free 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 28 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 1621 1620 Geographos 1621 1622 Chacornac 001621 Category:Discoveries by Sergei Belyavsky Category:Named minor planets 001621 19261001