1999 Hirayama

Dark main-belt asteroid October 2019 yes 1999 Hirayama #D6D6D6 001999-asteroid shape model (1999) Hirayama.png Modelled shape of Hirayama from its lightcurve L. Kohoutek Bergedorf Obs. 27 February 1973 (1999) Hirayama 1973 DR1935 GF1940 EH1951 EY 11951 FA1965 UF1969 NB1975 NE Kiyotsugu Hirayama(Japanese astronomer) main-belt(outer) 4 September 2017 (JD 2458000.5) 0 77.24 yr (28,212 days) 3.4757 AU 2.7575 AU 3.1166 AU 0.1152 5.50 yr (2,010 days) 39.370° 0.1791 ms / day 12.529° 148.03° 357.05° 33.77 km (derived)33.95 2.1 km35.68 0.55 km38.28 0.40 km 13.5921 0.0003 hLCDB-Hamanowa-201115.63 0.01 h22.37 0.03 h 0.053 0.0050.0617 (derived)0.082 0.0030.0882 0.012 C 10.610.78 0.3110.9011.0 1999 Hirayama (prov. designation: 1973 DR) is a dark background asteroid from the outer region of the asteroid belt, approximately 34 km mi off 2 us in diameter. It was discovered on 27 February 1973, by Czech astronomer Luboš Kohoutek at the Hamburger Bergedorf Observatory in Germany, and later named after Japanese astronomer Kiyotsugu Hirayama. Orbit and classification Hirayama orbits the Sun in the outer main-belt at a distance of 2.8–3.5 AU once every 5 years and 6 months (2,010 days). Its orbit has an eccentricity of 0.12 and an inclination of 13° with respect to the ecliptic. The spectrum of Hirayama matches a C-type classification on the Tholen taxonomic scheme, but with a "broad absorption band that can be associated to a process of aqueous alteration". That is, the surface appears to show some form of water modification. Naming This minor planet is named in honour of Japanese astronomer Kiyotsugu Hirayama (1874–1943), best known for his discovery that many asteroid orbits were more similar to one another than chance would allow, leading to the concept of asteroid families, now called Hirayama families. The lunar crater Hirayama is also named in his honour. The official 1999 naming citation was published by the Minor Planet Center on 15 October 1977 (M.P.C. 4237). Physical characteristics Rotation period A rotational lightcurve of Hirayama was obtained at the Menke Observatory in February 2002. It showed a periodicity of 15.63 0.01 hours, during which time the brightness of Hirayama varies by 0.45 0.04 in magnitude (U=3-). At the same time, photometric observations by astronomers Roberto Crippa and Federico Manzini gave a rotation period of 22.37 hours and a brightness variation of 0.47 magnitude (U=2). These results supersede an observation from January 2005, by Hiromi and Hiroko Hamanowa at their Hamanowa Astronomical Observatory, Japan, that gave a shorter period of 13.59 hours with an amplitude of 0.57 magnitude.(U=n.a.).LCDB-Hamanowa-2011 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, the asteroid measures between 34.0 and 38.3 kilometers in diameter and its surface has an albedo between 0.053 and 0.088. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.062 and a diameter of 33.8 kilometers with an absolute magnitude of 11.0. Notes LCDB-Hamanowa-2011 Hamanowa (2011) web: rotation period 13.5921 0.0003 hours with a brightness amplitude of 0.57 mag. Summary figures at http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1999%7CHirayama Collaborative Asteroid Lightcurve Link (CALL) for (1999) Hirayama References 30em 2017-06-05 last obs. JPL Small-Body Database Browser: 1999 Hirayama (1973 DR) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001999 Jet Propulsion Laboratory 1 July 2017 Dictionary of Minor Planet Names – (1999) Hirayama Schmadel Lutz D. Springer Berlin Heidelberg (1999) Hirayama 162 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_2000 1999 Hirayama (1973 DR) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1999 8 December 2016 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 Asteroids and comets rotation curves – (1999) Hirayama Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001999 8 December 2016 3 August 2003 https://web.archive.org/web/20030803183423/http://obswww.unige.ch/~behrend/page4cou.html#001999 dead D. Lazzaro C. A. Angeli J. M. Carvano T. Mothé-Diniz R. Duffard M. Florczak November 2004 S3OS2: the visible spectroscopic survey of 820 asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004Icar..172..179L Icarus 172 1 179–220 2004Icar..172..179L 10.1016/j.icarus.2004.06.006 8 December 2016 1999 8 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 (online, AcuA catalog p. 153) E. F. Tedesco P. V. Noah M. Noah S. D. Price October 2004 IRAS Minor Planet Survey V6.0 https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 17 October 2019 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 8 December 2016 Menke John Cooney Walt Gross John Terrell Dirk Higgins David October 2008 Asteroid Lightcurve Analysis at Menke Observatory Minor Planet Bulletin http://www.minorplanet.info/MPB/issues/MPB_35-4.pdf 35 4 155–160 2008MPBu...35..155M 1052-8091 17 March 2020 17 March 2020 https://web.archive.org/web/20200317170259/http://www.minorplanet.info/MPB/issues/MPB_35-4.pdf dead 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 8 December 2016 External links Lightcurve Database Query (LCDB), at www.minorplanet.info 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 – Geneva Observatory, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1999 1998 Titius 1999 2000 Herschel 001999 Category:Discoveries by Luboš Kohoutek Category:Named minor planets 19730227