1946 Walraven

Stony main-belt asteroid October 2019 yes 1946 Walraven #D6D6D6 001946-asteroid shape model (1946) Walraven.png Modelled shape of Walraven from its lightcurve H. van Gent Johannesburg Obs.(Leiden Southern Station) 8 August 1931 (1946) Walraven 1931 PH1952 PB1959 RE 11966 TC1972 JE 1 Theodore Walraven(astronomer) main-belt(inner) 4 September 2017 (JD 2458000.5) 0 85.73 yr (31,314 days) 2.8329 AU 1.7564 AU 2.2947 AU 0.2346 3.48 yr (1,270 days) 242.32° 0.2835 ms / day 8.1606° 17.269° 340.01° 9.205 0.109 km11.83 km (calculated) 10.21 0.01 h10.2101 0.0005 h10.22 0.02 h10.223 h 0.20 (assumed)0.362 0.067 S 11.912.0 1946 Walraven (prov. designation: 1931 PH) is a stony asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 8 August 1931, by Dutch astronomer Hendrik van Gent at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa, and named after astronomer Theodore Walraven. Classification and orbit Walraven is a stony S-type asteroid that orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 6 months (1,270 days). Its orbit has an eccentricity of 0.23 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins one day prior to its official discovery observation. Naming This minor planet was named in honor of astronomer and pioneer in optical instrumentation and precision photometry, Theodore Fjeda Walraven (1916–2008), who was a professor at the Leiden University and for many years resident astronomer at the former Leiden Southern Station near Hartbeespoortdam, South Africa. Walraven constructed special photometers for the telescopes at the station, including the 5-color photometer for which he developed the Walraven photometric system. The approved naming citation was published by the Minor Planet Center on 2 April 1988 (M.P.C. 12968). Physical characteristics Rotation period Four rotational lightcurves of Walraven were obtained from photometric observation, giving a rotation period between 10.210 and 10.223 hours with a brightness variation of 0.60 to 0.90 magnitude (U=2+/n.a./2/2). Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Walraven measures 9.2 kilometers in diameter and its surface has an albedo of 0.362, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20, and calculates a diameter of 11.8 kilometers with an absolute magnitude of 12.0. References 30em 2017-05-01 last obs. JPL Small-Body Database Browser: 1946 Walraven (1931 PH) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001946 Jet Propulsion Laboratory 2 July 2017 Dictionary of Minor Planet Names – (1946) Walraven Schmadel Lutz D. Springer Berlin Heidelberg 156 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1947 (1946) Walraven 1946 Walraven (1931 PH) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1946 9 December 2016 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 9 December 2016 Theodore Walraven (1916–2008) Dutch pioneer in optical instrumentation and precision photometry Leiden Observatory https://www.strw.leidenuniv.nl/jobs/theodore_walraven.php 7 November 2015 https://web.archive.org/web/20150924111019/http://www.strw.leidenuniv.nl/jobs/theodore_walraven.php 2015-09-24 1946 9 December 2016 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 van Gent, H. May 1933 Period, light-curve, and ephemeris of the new asteroid with variable brightness 1931 PH http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1933BAN.....7...65V Bulletin of the Astronomical Institutes of the Netherlands 7 65 1933BAN.....7...65V 9 December 2016 6 James Folberth Serick Casimir Yueheng Dou Davis Evans Thomas Foulkes Miranda Haenftling Peter Kuhn Alexander White Richard Ditteon April 2012 Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2011 July–September http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39...51F The Minor Planet Bulletin 39 2 51–55 1052-8091 2012MPBu...39...51F 9 December 2016 6 J. Hanus J. Durech D. A. Oszkiewicz R. Behrend B. Carry M. Delbo O. Adam V. Afonina R. Anquetin P. Antonini L. Arnold M. Audejean P. Aurard M. Bachschmidt B. Baduel E. Barbotin P. Barroy P. Baudouin L. Berard N. Berger L. Bernasconi J.-G. Bosch S. Bouley I. Bozhinova J. Brinsfield L. Brunetto G. Canaud J. Caron F. Carrier G. Casalnuovo S. Casulli M. Cerda L. Chalamet S. Charbonnel B. Chinaglia A. Cikota F. Colas J.-F. Coliac A. Collet J. Coloma M. Conjat E. Conseil R. Costa R. Crippa M. Cristofanelli Y. Damerdji Debackè A. re A. Decock Q. Déhais T. Déléage S. Delmelle C. Demeautis M. Drózdz G. Dubos T. Dulcamara M. Dumont R. Durkee R. Dymock A. Escalante del Valle N. Esseiva R. Esseiva M. Esteban T. Fauchez M. Fauerbach M. Fauvaud S. Fauvaud E. Forné C. Fournel D. Fradet J. Garlitz O. Gerteis C. Gillier M. Gillon R. Giraud J.-P. Godard R. Goncalves Hiroko Hamanowa Hiromi Hamanowa K. Hay S. Hellmich S. Heterier D. Higgins R. Hirsch G. Hodosan M. Hren A. Hygate N. Innocent H. Jacquinot S. Jawahar E. Jehin L. Jerosimic A. Klotz W. Koff P. Korlevic E. Kosturkiewicz P. Krafft Y. Krugly F. Kugel O. Labrevoir J. Lecacheux M. Lehký A. Leroy B. Lesquerbault M. J. Lopez-Gonzales M. Lutz B. Mallecot J. Manfroid F. Manzini A. Marciniak A. Martin B. Modave R. Montaigut J. Montier E. Morelle B. Morton S. Mottola R. Naves J. Nomen J. Oey W. Ogloza M. Paiella H. Pallares A. Peyrot F. Pilcher J.-F. Pirenne P. Piron M. Polinska M. Polotto R. Poncy J. P. Previt F. Reignier D. Renauld D. Ricci F. Richard C. Rinner V. Risoldi D. Robilliard D. Romeuf G. Rousseau R. Roy J. Ruthroff P. A. Salom L. Salvador S. Sanchez T. Santana-Ros A. Scholz G. Séné B. Skiff K. Sobkowiak P. Sogorb F. Soldán A. Spiridakis E. Splanska S. Sposetti D. Starkey R. Stephens A. Stiepen R. Stoss J. Strajnic J.-P. Teng G. Tumolo A. Vagnozzi B. Vanoutryve J. M. Vugnon B. D. Warner M. Waucomont O. Wertz M. Winiarski M. Wolf February 2016 New and updated convex shape models of asteroids based on optical data from a large collaboration network http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...586A.108H Astronomy and Astrophysics 586 24 2016A&A...586A.108H 10.1051/0004-6361/201527441 9 December 2016 1510.07422 6 Amadeo Aznar Macias Alfonso Carreno Garcerain Enrique Arce Masego Pedro Brines Rodriguez Juan Lozano de Haro Alvaro Fornas Silva Gonzalo Fornas Silva Vicente Mas Martinez Onofre Rodrigo Chiner David Herrero Porta July 2016 Twenty-one Asteroid Lightcurves at Group Observadores de Asteroides (OBAS): Late 2015 to Early 2016 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43..257A The Minor Planet Bulletin 43 3 257–263 1052-8091 2016MPBu...43..257A 9 December 2016 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 9 December 2016 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20110721225144/http://www.minorplanet.info/lightcurvedatabase.html 21 July 2011 ) 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 1946 1945 Wesselink 1946 1947 Iso-Heikkilä 001946 Category:Discoveries by Hendrik van Gent Category:Named minor planets 19310808