1684 Iguassú

Main-belt asteroid October 2019 yes 1684 Iguassú #D6D6D6 23 August 1951 M. Itzigsohn La Plata Obs. (1684) Iguassú 1951 QE1934 LN1935 SK 11939 HK1949 DE1950 JT1965 AA 1A922 DA Iguazu Falls (South America) main-belt(outer) 4 September 2017 (JD 2458000.5) 0 94.75 yr (34,606 days) 3.4852 AU 2.7109 AU 3.0980 AU 0.1250 5.45 yr (1,992 days) 113.36° 0.1807 ms / day 3.6665° 105.40° 154.27° 30.210 0.32130.5 3.0 km30.62 km (calculated)31.381 0.336 km 9.1423 0.0033 h9.230 0.170 h 0.057 (assumed)0.08 0.020.0859 0.00640.093 0.009 C 10.700 0.140 (R)10.810.848 0.001 (R)10.9010.91 0.2111.011.3 1684 Iguassú, provisional designation 1951 QE, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 30.5 kilometers in diameter. It was discovered on 23 August 1951, by Argentine astronomer Miguel Itzigsohn at the La Plata Astronomical Observatory, located in the city of La Plata, Argentina. It was named after the Iguazu Falls in South America. Orbit and classification The asteroid orbits the Sun in the outer main-belt at a distance of 2.7–3.5 AU once every 5 years and 5 months (1,992 days). Its orbit has an eccentricity of 0.13 and an inclination of 4° with respect to the ecliptic. Physical characteristics Iguassú is characterized as a carbonaceous C-type asteroid. Rotation period In January 2014, two rotational lightcurves of Iguassú were obtained at the Palomar Transient Factory in California. They gave a rotation period of 9.14 and 9.23 hours, respectively, both with a brightness change of 0.15 in magnitude (U=2/2). Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Iguassú measures between 30.21 and 31.38 kilometers in diameter, and its surface has an albedo between 0.08 and 0.093. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 30.62 kilometers based on an absolute magnitude of 11.3. Naming This minor planet is named for the large Iguazu Falls, a 60 meters high and 1 kilometer wide waterfall, which river of the same name marks part of the boundary between Argentina and Brazil. As a curiosity, the spelling of the minor planet's name (Iguassú) neither concurs with the Spanish "Iguazú" nor with the Portuguese "Iguaçu". It is rather similar to "Yguasu", used in the native Guarani language, from which the waterfall's name originates.December 2025 The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6832). References 30em 2016-11-19 last obs. JPL Small-Body Database Browser: 1684 Iguassu (1951 QE) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001684 Jet Propulsion Laboratory 6 June 2017 Dictionary of Minor Planet Names – (1684) Iguassú Schmadel Lutz D. Springer Berlin Heidelberg 134 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1685 (1684) Iguassú 1684 Iguassu (1951 QE) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1684 22 December 2016 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 22 December 2016 1684 22 December 2016 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 V. Alí-Lagoa J. Licandro R. Gil-Hutton Cañ M. ada-Assandri M. Delbo' J. de León H. Campins N. Pinilla-Alonso M. S. P. Kelley J. Hanus June 2016 Differences between the Pallas collisional family and similarly sized B-type asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...591A..14A Astronomy and Astrophysics 591 11 2016A&A...591A..14A 10.1051/0004-6361/201527660 22 December 2016 free 11336/63614 free 6 Chan-Kao Chang Wing-Huen Ip Ip Wing-huen Hsing-Wen Lin Yu-Chi Cheng Chow-Choong Ngeow Ting-Chang Yang Adam Waszczak Shrinivas R. Kulkarni David Levitan Branimir Sesar Russ Laher Jason Surace Thomas. A. Prince August 2015 Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJS..219...27C The Astrophysical Journal Supplement Series 219 2 19 2015ApJS..219...27C 10.1088/0067-0049/219/2/27 1506.08493 22 December 2016 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 22 December 2016 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 22 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 22 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 1684 1683 Castafiore 1684 1685 Toro 001684 Category:Discoveries by Miguel Itzigsohn Category:Named minor planets 19510823