1447 Utra

Stony asteroid, slow rotator and suspected tumbler October 2019 yes 1447 Utra #D6D6D6 26 January 1938 Y. Väisälä Turku Obs. (1447) Utra 1938 BB1936 SB1951 KOA918 FA Utra (Finnish town) main-belt(middle) 4 September 2017 (JD 2458000.5) 0 98.67 yr (36,038 days) 2.6404 AU 2.4299 AU 2.5352 AU 0.0415 4.04 yr (1,474 days) 285.64° 0.2442 ms / day 4.7865° 35.528° 64.085° 11.83 0.86 km11.834 0.122 km12.634 0.103 km13.26 0.53 km13.58 km (calculated) 257 30 hLCDB-Martinez-2011 0.20 (assumed)0.303 0.0380.3381 0.05910.381 0.058 S 11.3011.60 0.4411.7 1447 Utra, provisional designation 1938 BB, is a stony asteroid, slow rotator and suspected tumbler from the central region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 26 January 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The asteroid was named for the Finnish town of Utra (now a part of Joensuu). Orbit and classification Utra is a S-type asteroid. It orbits the Sun in the central main-belt at a distance of 2.4–2.6 AU once every 4.04 years (1,474 days). Its orbit has an eccentricity of 0.04 and an inclination of 5° with respect to the ecliptic. Utra was first identified as A918 FA at Heidelberg Observatory in 1918. The body's observation arc begins with its official discovery observation at Turku in 1938. Physical characteristics Slow rotator In March 2011, a rotational lightcurve of Utra was obtained from photometric observations by astronomer Luis E. Martinez. Lightcurve analysis gave a long rotation period of 257 hours with a brightness variation of 0.63 magnitude (U=2). This slow rotator is also a suspected tumbler (T0).LCDB-Martinez-2011 Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Utra measures between 11.83 and 13.26 kilometers in diameter, and its surface has an albedo between 0.303 and 0.381. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 13.58 kilometers with an absolute magnitude of 11.7. Naming This minor planet was named for Utra, a northeastern Finnish town and birthplace of the discoverer. The official 1447 naming citation was published by the Minor Planet Center on 30 January 1964 (M.P.C. 2277). Notes LCDB-Martinez-2011 Martinez (2011) web: rotation period 257 30 hours with a brightness amplitude of 0.63 mag. Summary figures for (1447) Utra at Collaborative Asteroid Lightcurve Link (CALL). The referenced website was a non-recoverable dead link. References 30em 2016-11-14 last obs. JPL Small-Body Database Browser: 1447 Utra (1938 BB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001447 Jet Propulsion Laboratory 25 July 2017 Dictionary of Minor Planet Names – (1447) Utra Schmadel Lutz D. Springer Berlin Heidelberg 116 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1448 (1447) Utra 1447 Utra (1938 BB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1447 4 January 2017 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 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 4 January 2017 1447 4 January 2017 6 Fumihiko Usui Daisuke Kuroda Thomas G. 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 free (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 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 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 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 1447 1446 Sillanpää 1447 1448 Lindbladia 001447 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 001447 19380126