1631 Kopff

Main-belt asteroid October 2019 yes 1631 Kopff #D6D6D6 11 October 1936 Y. Väisälä Turku Obs. (1631) Kopff 1936 UC1926 TH1935 FG1946 SA1952 HV 2 August Kopff (astronomer) main-beltFlora 4 September 2017 (JD 2458000.5) 0 90.37 yr (33,006 days) 2.7129 AU 1.7572 AU 2.2350 AU 0.2138 3.34 yr (1,220 days) 107.17° 7.4943° 16.826° 315.11° 8.636 0.395 km9.58 0.21 km9.66 1.2 km9.71 km (derived) 6.683 0.001 h 0.2497 0.0740.259 0.0120.2710 (derived)0.342 0.061 S 12.112.212.57 0.35 1631 Kopff (provisional designation 1936 UC) is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 11 October 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.discovery-note It was later named after German astronomer August Kopff. Classification and orbit Kopff is a member of the Flora family, one of the largest collisional families of stony S-type asteroid. It orbits the Sun in the inner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,220 days). Its orbit has an eccentricity of 0.21 and an inclination of 7° with respect to the ecliptic. First identified as 1926 TH at Heidelberg in 1926, the body's observation arc begins with its official discovery observation at Turku in 1936. Physical characteristics Rotation period In November 2003, a rotational lightcurve of Kopff was obtained from remote photometric observations at the Tenagra and Tenagra II Observatories. Lightcurve analysis gave a well-defined rotation period of 6.683 hours with a brightness variation of 0.41 magnitude (U=3). 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, Kopff measures between 8.64 and 9.66 kilometers in diameter and its surface has an albedo between 0.2497 and 0.342. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.271 and a diameter of 9.71 kilometers, with an absolute magnitude of 12.1. Naming This minor planet was named for German astronomer August Kopff (1882–1960). He was first an assistant to Max Wolf, and became later a prolific discoverer of minor planets himself. In 1924, Kopff became Director of the Astronomisches Rechen-Institut in Berlin, and, after the western section moved to Heidelberg, he also became director of the Heidelberg Observatory. Under his leadership, the third Catalogue of Fundamental Stars (FK3) was compiled and the work on the fourth catalogue (FK4) was initiated. The lunar crater Kopff is also named in his honour. The official 1631 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3931). Notes discovery-note Quoted from Dictionary of Minor Planet Names – (1631) Kopff: "Karl Reinmuth discovered the planet as 1926 TH on 5 October 1926. The planet could only have been observed on two nights which was not sufficient to derive a reliable orbit. The discovery is therefore credited to Yrjö Väisälä. Elliptical elements were derived by H. Walter (MPC 1897) from five positions of 1936 UC. The identity between both apparitions was found by André Patry (MPC 1451)." References 30em 2017-02-15 last obs. JPL Small-Body Database Browser: 1631 Kopff (1936 UC) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001631 https://web.archive.org/web/20200918020235/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001631 dead 18 September 2020 Jet Propulsion Laboratory 30 June 2017 Dictionary of Minor Planet Names – (1631) Kopff Schmadel Lutz D. Springer Berlin Heidelberg 129 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1632 (1631) Kopff 1631 Kopff (1936 UC) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1631 27 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 2009 https://cds.cern.ch/record/1339661 1631 27 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 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 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 The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 Pedro V. Sada Eder D. Canizales Edgar M. Armada September 2004 CCD photometry of asteroids 970 Primula and 1631 Kopff using a remote commercial telescope The Minor Planet Bulletin 31 3 49–50 1052-8091 2004MPBu...31...49S 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 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 1631 1630 Milet 1631 1632 Sieböhme 001631 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 19361011