1971 Hagihara

Main-belt asteroid October 2019 yes 1971 Hagihara #D6D6D6 14 September 1955 Indiana University(Indiana Asteroid Program) Goethe Link Obs. (1971) Hagihara 1955 RD 11971 TZ 2 Yusuke Hagihara(astronomer) main-belt(outer)Eos 4 September 2017 (JD 2458000.5) 0 59.65 yr (21,787 days) 3.2479 AU 2.7370 AU 2.9924 AU 0.0854 5.18 yr (1,891 days) 294.31° 0.1904 ms / day 8.6990° 300.12° 120.50° 12.289 0.15615 7 km (converted) 0.135 0.028 12.3 1971 Hagihara, provisional designation 1955 RD 1, is an Eoan asteroid from the outer region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 14 September 1955, by the Indiana Asteroid Program at the Goethe Link Observatory near Brooklyn, Indiana, United States. It was later named after Japanese astronomer Yusuke Hagihara. Orbit and classification Hagihara is a member of the Eos family (606), the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.23 It orbits the Sun in the outer main-belt at a distance of 2.7–3.2 AU once every 5 years and 2 months (1,891 days). Its orbit has an eccentricity of 0.09 and an inclination of 9° with respect to the ecliptic. The asteroid's observation arc begins with its discovery observation at Goethe in September 1955. Physical characteristics According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Hagihara measures 12.3 kilometers in diameter and its surface has an albedo of 0.135, which is neither typical for stony nor for carbonaceous bodies. As of 2017, the asteroid's composition and spectral type, as well as its rotation period and shape remain unknown. Naming This minor planet was named in honour of Yusuke Hagihara (1897–1979) on the occasion of his 81st birthday. He was professor of astronomy at the University of Tokyo and director of the Tokyo Observatory. He also served as vice-president of the International Astronomical Union and was the president of its Commission VII. Hagihara is best known for the discussion of stability problems in celestial mechanics and his theory of libratory motions, as well as for important contributions to the study of the velocity distribution of free electrons in planetary nebulae, and his important five-volume treatise on celestial mechanics. The official 1971 naming citation was published by the Minor Planet Center on 1 August 1978 (M.P.C. 4419). References 30em 2015-05-09 last obs. JPL Small-Body Database Browser: 1971 Hagihara (1955 RD1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001971 Jet Propulsion Laboratory 1 July 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 159 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1972 (1971) Hagihara 1971 Hagihara (1955 RD1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1971 29 August 2016 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 Asteroid Size Estimator CNEOS NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 12 November 2017 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 29 August 2016 Asteroid 1971 Hagihara – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1971+Hagihara#Asteroid%201971%20HagiharaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 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 978-0-8165-3213-1 1971 4 April 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 1971 1970 Sumeria 1971 1972 Yi Xing 001971 001971 Category:Named minor planets 19550914