1928 Summa

Stony main-belt asteroid October 2019 yes 1928 Summa #D6D6D6 21 September 1938 Y. Väisälä Turku Obs. (1928) Summa 1938 SO1969 PA Finnish village(Battle of Summa) main-belt(inner) 4 September 2017 (JD 2458000.5) 0 78.38 yr (28,628 days) 2.9797 AU 1.9733 AU 2.4765 AU 0.2032 3.90 yr (1,423 days) 98.003° 0.2529 ms / day 4.5756° 180.42° 157.80° 8.34 km (derived)9.333 0.170 km 6.8549 0.0006 h6.855 0.001 h9.66 h (dated) 0.160 0.0430.20 (assumed) SB–V = 1.010 12.6812.7613.20 0.85 1928 Summa, provisional designation 1938 SO, is a stony asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 21 September 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. It was named for a Finnish village where the Battle of Summa took place. Orbit and classification Summa is a S-type asteroid that orbits the Sun in the inner main-belt at a distance of 2.0–3.0 AU once every 3 years and 11 months (1,423 days). Its orbit has an eccentricity of 0.20 and an inclination of 5° with respect to the ecliptic. The body's observation arc begins at Turku one night after its official discovery observation, with no precoveries taken, and no prior identifications made. Rotation period In March 1984, the first but poorly rated rotational lightcurve of Summa was obtained from photometric observations by American astronomer Richard Binzel. It gave a rotation period of 9.66 hours with a brightness amplitude of 0.14 magnitude (U=1). In August 2012, a refined yet ambiguous lightcurve with a period of 6.855 hours and an amplitude of 0.13 was obtained by Larry E. Owings at the Barnes Ridge Observatory in California (U=2+). Lightcurve analysis also considered that Summa might be a binary system. One month later, the so-far best rated lightcurve from British astronomer Kevin Hills using the remote controlled Riverland Dingo Observatory in Australia, gave a period of 6.8549 hours with a brightness amplitude of 0.18 (U=3). Diameter an albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Summa measures 9.333 kilometers in diameter and its surface has an albedo of 0.160, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.34 kilometers with an absolute magnitude of 12.76. Naming This minor planet was named after the village on the Karelian Isthmus, where the Battle of Summa took place during the Finnish Winter War (1939–1940). The approved naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5450). Most of Yrjö Väisälä's discoveries have names that relate in one way or another to this military conflict between Finland and the Soviet Union during World War II. References 30em 2017-02-08 last obs. JPL Small-Body Database Browser: 1928 Summa (1938 SO) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001928 Jet Propulsion Laboratory 2 July 2017 Dictionary of Minor Planet Names – (1928) Summa Schmadel Lutz D. Springer Berlin Heidelberg 155 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1929 (1928) Summa 1928 Summa (1938 SO) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1928 5 April 2017 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 5 April 2017 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 5 April 2017 1928 5 April 2017 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 Binzel, R. P. October 1987 A photoelectric survey of 130 asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987Icar...72..135B Icarus 72 1 135–208 0019-1035 1987Icar...72..135B 10.1016/0019-1035(87)90125-4 5 April 2017 Hills, Kevin January 2013 Asteroid Lightcurve Analysis at Riverland Dingo Observatory (RDO): 501 Urhixidur, 1897 Hind, 1928 Summa, 6261 Chione, and (68216) 2001 CV 26. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40...12H The Minor Planet Bulletin 40 1 12–13 1052-8091 2013MPBu...40...12H 5 April 2017 Owings, Larry E. April 2013 Lightcurves for 1560 Strattonia, 1928 Summa, 2763 Jeans, 3478 Fanale, 3948 Bohr, 5275 Zdislava, and 5369 Virgiugum http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..104O The Minor Planet Bulletin 40 2 104–106 1052-8091 2013MPBu...40..104O 5 April 2017 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 5 April 2017 External links (1928) Summa https://web.archive.org/web/20160305205940/http://hills-observatory.org/asteroid-lc-01928.htm 5 March 2016 , lightcurve at Hills Observatory, Kevin Hills Kevin Hills, Asteroid hunter realizes life's dreams at GRAS, Remote asteroid hunting from the UK, July 2009 Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20110721225144/http://www.minorplanet.info/lightcurvedatabase.html 21 July 2011 ) 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 1928 1927 Suvanto 1928 1929 Kollaa 001928 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 19380921