1521 Seinäjoki

Main-belt asteroid October 2019 yes 1521 Seinäjoki #D6D6D6 001521-asteroid shape model (1521) Seinäjoki.png Shape model of Seinäjoki from its lightcurve 22 October 1938 Y. Väisälä Turku Obs. (1521) Seinäjoki 1938 UB 11933 UR 11967 UW Seinäjoki (Finnish city) main-belt(outer)Brasilia 4 September 2017 (JD 2458000.5) 0 78.62 yr (28,716 days) 3.2435 AU 2.4633 AU 2.8534 AU 0.1367 4.82 yr (1,760 days) 123.44° 0.2045 ms / day 15.059° 12.593° 48.805° 13.66 3.61 km14.813 0.070 km16.095 0.070 km16.29 0.20 km24.30 km (calculated) 4.32 0.01 h4.328159 0.000001 h 0.057 (assumed)0.116 0.0180.1733 0.03000.205 0.0150.22 0.12 C 11.511.811.9011.9212.17 0.45 1521 Seinäjoki (provisional designation 1938 UB 1) is a Brasilia asteroid from the outer region of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 22 October 1938, by Finnish astronomer Yrjö Väisälä at the southwestern Turku Observatory, Finland. The asteroid was later named after the Finnish city of Seinäjoki. Orbit and classification Seinäjoki is a member of the Brasilia family, a smaller asteroid family of X-type asteroids in the outer main-belt. Since the family's namesake, 293 Brasilia, is a suspected interloper in its own family, it has also been named Seinäjoki family after Seinäjoki.37 It orbits the Sun in the outer main-belt at a distance of 2.5–3.2 AU once every 4 years and 10 months (1,760 days). Its orbit has an eccentricity of 0.14 and an inclination of 15° with respect to the ecliptic. In 1933, Seinäjoki was first identified as 1933 UR 1 at Simeiz Observatory. The body's observation arc, however, begins with its official discovery observation at Turku. Physical characteristics Rotation and pole In October 2010, a rotational lightcurve of Seinäjoki was obtained by Russell Durkee at the U.S. Shed of Science Observatory (H39) in Minneapolis. It gave it a well-defined rotation period of 4.32 hours with a brightness variation of 0.15 magnitude (U=3). A modeled lightcurve form Lowell photometric database gave a concurring period of 4.328 hours and a spin axis of (-18.0°, 230.0°) in ecliptic coordinates. Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Seinäjoki measures between 13.66 and 14.81 kilometers in diameter, and its surface has an albedo between 0.205 and 0.22 (more recent results only). The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous C-type asteroids of 0.057 and calculates a much larger diameter of 24.30 kilometers as a body's and diameter and reflectivity (albeo) correlate indirectly. However, based on the much higher albedo given by WISE/NEOWISE, the body is rather of a stony composition, which is untypical for asteroids in the outer main-belt. Naming This minor planet was named for the city of Seinäjoki, located in Southern Ostrobothnia, western Finland. The official 1521 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3929). References 30em 2017-06-05 last obs. JPL Small-Body Database Browser: 1521 Seinajoki (1938 UB1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001521 Jet Propulsion Laboratory 30 June 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 121 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1522 (1521) Seinäjoki 1521 Seinajoki (1938 UB1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1521 3 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 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 3 January 2017 D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 Asteroid 1521 Seinajoki – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1521+Seinajoki#Asteroid%201521%20SeinajokiEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 October 2026 InternetArchiveBot 1521 3 January 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 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri C. Nugent M. S. Cabrera November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 3 January 2017 6 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 free Durkee, Russell I. January 2011 Asteroids Observed from the Shed of Science Observatory: 2010 May–October http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38...39D The Minor Planet Bulletin 38 1 39–40 1052-8091 2011MPBu...38...39D 3 January 2017 J. Durech J. Hanus D. Oszkiewicz R. Vanco March 2016 Asteroid models from the Lowell photometric database http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...587A..48D Astronomy and Astrophysics 587 6 2016A&A...587A..48D 10.1051/0004-6361/201527573 1601.02909 3 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 3 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 1521 1520 Imatra 1521 1522 Kokkola 001521 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 19381022