1508 Kemi

Asteroid October 2019 yes 1508 Kemi #FA8072 001508-asteroid shape model (1508) Kemi.png Shape model of Kemi from its lightcurve H. Alikoski Turku Obs. 21 October 1938 (1508) Kemi 1938 UP1935 FA1938 UO Kemi and Kemi River  (Finnish town and river) Mars-crosser 4 September 2017 (JD 2458000.5) 0 81.79 yr (29,873 days) 3.9264 AU 1.6167 AU 2.7716 AU 0.4167 4.61 yr (1,685 days) 354.04° 0.2136 ms / day 28.723° 14.298° 92.892° 0.3966 AU 15.78 1.58 km15.9 1.6 km16 2 km17.98 1.34 km21.86 km (calculated) 9.15 h9.19 0.05 h9.19182 0.00005 h9.196 0.001 hlightcurve-plot-Antelope-Hills11.36 h 0.057 (assumed)0.084 0.0130.109 0.0220.11 0.02 Tholen BCFSMASS CB–V 0.645U–B 0.249 12.03 1508 Kemi (provisional designation 1938 UP) is an eccentric, carbonaceous asteroid and one of the largest Mars-crossers, approximately 17 kilometers in diameter. Discovered by Heikki Alikoski at Turku Observatory in 1938, the asteroid was later named after the Finnish town of Kemi and the Kemi River. Discovery Kemi was discovered on 21 October 1938, by Finnish astronomer Heikki Alikoski at the Iso-Heikkilä Observatory in Turku, Finland. It was independently discovered by Hungarian astronomer György Kulin at Konkoly Observatory near Budapest on 30 October 1938. The Minor Planet Center, however, only acknowledges the first discoverer. The asteroid was first identified as 1935 FA at Uccle Observatory in March 1935. Orbit and classification Kemi is a Mars-crossing asteroid as it crosses the orbit of Mars at 1.666 AU. Because of its high inclination, it has been grouped with the Pallas family (801), an asteroid family of bright carbonaceous asteroids, as well as with the "Phaethon group", despite its untypical spectrum. It orbits the Sun at a distance of 1.6–3.9 AU once every 4 years and 7 months (1,685 days). Its orbit has an eccentricity of 0.42 and an inclination of 29° with respect to the ecliptic. The body's observation arc begins at Uccle in May 1935, more than 3 years prior to its official discovery observation at Turku. Physical characteristics In the SMASS classification, Kemi is a common carbonaceous C-type asteroid. In the Tholen classification, the body's spectral type is ambiguous (BCF), closest to that of a bright carbonaceous B-type and somewhat similar to a C- and F-type asteroid. Rotation period Several rotational lightcurves of Kemi have been obtained from photometric observations since the 1990s. Analysis of the lightcurves gave a consolidated rotation period of 9.196 hours with a brightness variation between of 0.25 and 0.55 magnitude (U=2/3/3/2).lightcurve-plot-Antelope-Hills Poles In 2016, an international study modeled a lightcurve with a concurring period of 9.19182 hours. It also determined two spin axis at (352.0°, 72.0°) and (166.0°, 73.0°) in ecliptic coordinates (λ, β). Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Kemi measures between 15.78 and 17.98 kilometers in diameter and its surface has an albedo between 0.084 and 0.11. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 21.86 kilometers based on an absolute magnitude of 12.03. Naming This minor planet was named after the Finnish town of Kemi and the Kemi River (Kemijoki), the largest river in Finland, on which the town lies. The naming agrees with the established pattern of giving high-inclination asteroids four-letter names. The official 1508 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3928). Notes lightcurve-plot-Antelope-Hills Lightcurve plot of (1508) Kemi, Robert Koff, Antelope Hills Observatory (H09). Summary figures at LCDB References 30em 2017-01-09 last obs. JPL Small-Body Database Browser: 1508 Kemi (1938 UP) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001508 https://web.archive.org/web/20200820080033/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001508 20 August 2020 Jet Propulsion Laboratory 18 October 2017 Dictionary of Minor Planet Names – (1508) Kemi Schmadel Lutz D. Springer Berlin Heidelberg 120 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1509 (1508) Kemi 1508 Kemi (1938 UP) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1508 18 October 2017 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) Appendix – Publication Dates of the MPCs Schmadel Lutz D. 2009 Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 https://cds.cern.ch/record/1339661 Novaković Bojan Cellino Alberto Knežević Zoran November 2011 1 Icarus 69–81 Families among high-inclination asteroids 216 1108.3740 10.1016/j.icarus.2011.08.016 2011Icar..216...69N 6 Peter Jenniskens Jérémie Vaubaillon Richard P. Binzel Francesca E. DeMeo David Nesvorný William F. Bottke Alan Fitzsimmons Takahiro Hiroi Franck Marchis Janice L. Bishop Pierre Vernazza Michael E. Zolensky Jason S. Herrin Kees C. Welten Matthias M. M. Meier Muawia H. 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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 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 1508 1507 Vaasa 1508 1509 Esclangona 001508 Category:Discoveries by Heikki A. Alikoski Category:Named minor planets 001508 001508 19381021