1451 Granö

Main-belt asteroid April 2018 yes 1451 Granö #D6D6D6 22 February 1938 Y. Väisälä Turku Obs. (1451) Grano 1938 DT1976 WK Johannes Gabriel Granö(University of Turku) main-beltFlora 4 September 2017 (JD 2458000.5) 0 56.21 yr (20,532 days) 2.4619 AU 1.9442 AU 2.2030 AU 0.1175 3.27 yr (1,194 days) 60.928° 0.3014 ms / day 5.1087° 175.29° 51.858° 6.170 0.0726.329 0.037 km6.81 km (calculated)9.70 0.57 km 5.109 h (removed)LCDB-GenervaObs138 0.05 h 0.171 0.0220.20 (assumed)0.4034 0.09190.429 0.077 S 12.613.214.19 0.95 1451 Granö, provisional designation 1938 DT, is a stony Florian asteroid and slow rotator from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 22 February 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, and later named for Johannes Gabriel Granö, rector of the University of Turku. Orbit and classification The asteroid is a member of the Flora family, a large group of stony S-type asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,194 days). Its orbit has an eccentricity of 0.12 and an inclination of 5° with respect to the ecliptic. As no precoveries were taken, and no previous identifications were made, Granös observation arc begins with its official discovery observation in 1938. Physical characteristics Slow rotator A rotational lightcurve of Granö was obtained from photometric observations made by amateur astronomer Robert Stephens at GMARS and Santana Observatories in March 2010. Analysis gave a long rotation period of 138 hours with a brightness variation of 0.65 magnitude (U=2+). This makes Granö a slow rotating asteroid. The result supersedes a previous period of 5.1 hours from May 2007 (U=2-).LCDB-GenervaObs 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, Granö measures between 6.17 and 9.70 kilometers in diameter, and its surface has an albedo between 0.171 and 0.429. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 6.81 kilometers using an absolute magnitude of 13.2. Naming This minor planet was named after Johannes Gabriel Granö (1882−1956), Finnish professor of geography and rector at University of Turku from 1932 to 1934. The official 1451 naming citation was published by the Minor Planet Center on 30 January 1964 (M.P.C. 2277). Notes LCDB-GenervaObs Geneva Obs. Behrend (2007) web: rotation period 5.109 0.004 hours with a brightness amplitude of 0.06 mag. Summary figures for (1451) Grano at Collaborative Asteroid Lightcurve Link (CALL). Results are no longer published on website, see: Asteroids and comets rotation curves CdR – Observatoire de Genève, Raoul Behrend References 30em 2017-06-03 last obs. JPL Small-Body Database Browser: 1451 Grano (1938 DT) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001451 Jet Propulsion Laboratory 25 July 2017 Dictionary of Minor Planet Names – (1451) Granö Schmadel Lutz D. Springer Berlin Heidelberg 116 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1452 (1451) Granö 1451 Grano (1938 DT) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1451 16 December 2016 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 1451 16 December 2016 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 Stephens, Robert D. October 2010 Asteroids Observed from GMARS and Santana Observatories: 2010 April - June http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37..159S The Minor Planet Bulletin 37 4 159–161 1052-8091 2010MPBu...37..159S 16 December 2016 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 16 December 2016 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 16 December 2016 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 1451 1450 Raimonda 1451 1452 Hunnia 001451 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 001451 19380222