1512 Oulu

Hildian asteroid and slow rotator August 2026 yes 1512 Oulu #D6D6D6 1512 Oulu Hubble.jpg Hubble Space Telescope image of Oulu taken in 2012 18 March 1939 H. Alikoski Turku Obs. (1512) Oulu 1939 FE1938 CU1957 TA1958 XS Oulu (Finnish town) main-beltHilda 4 September 2017 (JD 2458000.5) 0 78.06 yr (28,510 days) 4.5541 AU 3.3892 AU 3.9717 AU 0.1466 7.92 yr (2,891 days) 333.83° 0.1245 ms / day 6.4785° 10.168° 238.20° 0.6287 AU 65.0 km65.000 4.137 km79.222 0.241 km82.72 2.5 km (IRAS:38)91.05 2.20 km 132.3 0.1 h 0.031 0.0010.0366 0.002 (IRAS:38)0.038 0.0050.0536 0.00610.05940.06 0.03 Tholen = PXPB–V = 0.715U–B = 0.190 9.629.92 0.40 1512 Oulu (provisional designation 1939 FE) is a dark Hildian asteroid, slow rotator and possibly the largest known tumbler orbiting in the outermost region of the asteroid belt. With a diameter of approximately 80 kilometers, it belongs to the fifty largest asteroids in the outer main-belt. The body was discovered on 18 March 1939, by Finnish astronomer Heikki Alikoski at Turku Observatory in Southwest Finland and named for the Finnish town Oulu. Orbit and classification Located in the outermost part of the main-belt, Oulu is a member of the Hilda family, a large orbital group of asteroids that are thought to have originated from the Kuiper belt. They orbit in a 3:2 orbital resonance with the gas giant Jupiter, meaning that for every 2 orbits Jupiter completes around the Sun, a Hildian asteroid will complete 3 orbits. As it does not cross the path of any of the planets, it will not be pulled out of orbit by Jupiter's gravitational field, and will likely remain in a stable orbit for thousands of years. Oulu orbits the Sun at a distance of 3.4–4.6 AU once every 7 years and 11 months (2,891 days). Its orbit has an eccentricity of 0.15 and an inclination of 6° concerning the ecliptic. In 1938, Oulu was first identified as 1938 CU at Bergedorf Observatory. Its observation arc, however, begins one month after its official discovery observation. Physical characteristics Oulu is characterized as a dark and reddish P-type asteroid in the Tholen taxonomy, of which only a few dozen bodies are currently known. Slow rotator and likely tumbler In May 2009, a rotational light curve of Oulu was obtained from photometric observations by Slovak astronomer Adrián Galád at Modra Observatory. Lightcurve analysis gave a rotation period of 132.3 hours with a brightness variation of 0.33 in magnitude (U=2+). It is among the top few hundred slow rotators. Oulu is likely in a state of non-principal axis rotation, which is commonly known as tumbling. It is the largest such object ever observed (also see List of tumblers). 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, Oulu measures between 65.00 and 91.05 kilometers in diameter, and its surface has an albedo between 0.031 and 0.06. The Collaborative Asteroid Lightcurve Link agrees with IRAS, that is, an albedo of 0.0366 and a diameter of 82.72 kilometers using an absolute magnitude of 9.62. In May 2002, Vasilij Shevchenko and Edward Tedesco observed an occultation by Oulu, that gave a diameter of 65.0 kilometers with an occultation albedo of 0.0594. Naming This minor planet was named for the northern Finnish town Oulu, the birthplace of the discoverer. The official 1512 naming citation was published by the Minor Planet Center on 30 January 1964 (M.P.C. 2278). References 30em 2017-05-02 last obs. JPL Small-Body Database Browser: 1512 Oulu (1939 FE) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001512 Jet Propulsion Laboratory 5 June 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 120 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1513 (1512) Oulu 1512 Oulu (1939 FE) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1512 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 JPL Small-Body Database Search Engine: spec. type = P (Tholen) JPL Solar System Dynamics http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=OBJ;c1_item=Ay;c1_op=%3D;c1_value=P;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsAiArApAxAy;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AyA 2015-06-17 6 T. Grav A. K. Mainzer J. Bauer J. Masiero T. Spahr R. S. McMillan R. Walker R. Cutri E. Wright P. R. Eisenhardt E. Blauvelt E. DeBaun D. Elsbury T. Gautier S. Gomillion E. Hand A. 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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 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 35447010 6 Mainzer, A. Grav, T. Masiero, J. Bauer, J. Wright, E. Cutri, R. M. McMillan, R. S. Cohen, M. Ressler, M. Eisenhardt, P. August 2011 Thermal Model Calibration for Minor Planets Observed with Wide-field Infrared Survey Explorer/NEOWISE http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...736..100M The Astrophysical Journal 736 2 9 2011ApJ...736..100M 10.1088/0004-637X/736/2/100 6 December 2015 50794389 Adrian Galad Leonard Kornos Jozef Vilagi January 2010 An Ensemble of Lightcurves from Modra http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37....9G The Minor Planet Bulletin 37 1 9–15 1052-8091 2010MPBu...37....9G 4 January 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 53493339 4 January 2017 6 P. Pravec P. Scheirich J. Durech J. Pollock P. Kusnirák K. Hornoch A. Galád D. Vokrouhlický A. W. Harris E. Jehin J. Manfroid C. Opitom M. Gillon F. Colas J. Oey J. Vrastil D. Reichart K. Ivarsen J. Haislip A. LaCluyze May 2014 The tumbling spin state of (99942) Apophis http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014Icar..233...48P Icarus 233 48–60 2014Icar..233...48P 10.1016/j.icarus.2014.01.026 23 November 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 1512 1511 Daléra 1512 1513 Mátra 001512 Category:Discoveries by Heikki A. Alikoski Category:Named minor planets 001512 001512 19390318