1449 Virtanen

Main-belt asteroid October 2019 yes 1449 Virtanen #D6D6D6 001449-asteroid shape model (1449) Virtanen.png Shape of Virtanen modelled from its lightcurve 20 February 1938 Y. Väisälä Turku Obs. (1449) Virtanen 1938 DO1928 DC Artturi Virtanen (biochemist) main-beltFlora 4 September 2017 (JD 2458000.5) 0 89.10 yr (32,543 days) 2.5378 AU 1.9069 AU 2.2223 AU 0.1419 3.31 yr (1,210 days) 289.08° 0.2975 ms / day 6.6413° 110.78° 132.16° 9.15 1.91 km9.263 0.098 km9.46 0.33 km9.947 0.092 km10.31 km (calculated) 14.770 0.440 h (R)30.495 0.005 h30.5 0.5 h30.5005 0.0005 h30.5006 0.0001 h30.52 0.01 h30.5421 0.7655 h (R)30.5465 0.3727 h (S) 0.24 (assumed)0.285 0.0380.2856 0.02740.36 0.15 Tholen = SS 11.690 0.150 (R)11.779 0.003 (R)12.012.112.2512.615 0.004 (S)13.21 0.09 1449 Virtanen, provisional designation 1938 DO, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 9.2 kilometers in diameter. It was discovered on 20 February 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, and named for Finnish biochemist Artturi Virtanen. Description Virtanen is a member of the Flora family, one of the largest collisional populations of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,210 days). Its orbit has an eccentricity of 0.14 and an inclination of 7° with respect to the ecliptic. In 1928, Virtanen was first identified as 1928 DC at Heidelberg, extending the body's observation arc by 10 years prior to its official discovery at Turku. Physical characteristics In the Tholen taxonomy, Virtanen is classified as a common S-type asteroid. Lightcurves Virtanens first rotational lightcurve was obtained by astronomers Pierre Antonini and Silvano Casulli in May 2007, followed by Australian astronomer Julian Oey at Leura (E17) and Kingsgrove Observatory (E19) in June 2008. The lightcurves gave a rotation period of approximately 30.5 hours with a brightness variation of 0.6 magnitude (U=2-/3-/3-). Additional periods were obtained from photometric observation in the R and S-band at the Palomar Transient Factory (U=2/2/2), and from modeled data using the Lowell photometric database and other data sources, which also gave two spin axis of (307.0°, 58.0°) and (89.0°, 61.0°) in ecliptic coordinates, respectively (U=n.a.). Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Virtanen measures between 9.15 and 9.947 kilometers in diameter, and its surface has an albedo between 0.285 and 0.36. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and calculates a diameter of 10.31 kilometers with an absolute magnitude of 12.1. Naming This minor planet was named for famous Finnish biochemist Artturi Virtanen (1895–1973), recipient of the 1945 Nobel Prize in Chemistry and president of the Academy of Finland for many years. The official 1449 naming citation was published by the Minor Planet Center on 15 February 1970 (M.P.C. 3023). References 30em 2017-03-31 last obs. JPL Small-Body Database Browser: 1449 Virtanen (1938 DO) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001449 Jet Propulsion Laboratory 25 July 2017 Dictionary of Minor Planet Names – (1449) Virtanen Schmadel Lutz D. Springer Berlin Heidelberg 116 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1450 (1449) Virtanen 1449 Virtanen (1938 DO) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1449 4 January 2017 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 2009dmpn.book.....S Asteroids and comets rotation curves – (1449) Virtanen Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001449 4 January 2017 3 August 2003 https://web.archive.org/web/20030803183423/http://obswww.unige.ch/~behrend/page4cou.html#001449 dead 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. 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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 53493339 4 January 2017 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 1449 1448 Lindbladia 1449 1450 Raimonda 001449 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 001449 19380220