1983 Bok

Dark main-belt asteroid October 2019 yes 1983 Bok #D6D6D6 001983-asteroid shape model (1983) Bok.png Modelled shape of Bok from its lightcurve E. Roemer Catalina Stn. 9 June 1975 (1983) Bok 1975 LB1950 RV1963 UJ Bart Bok andPriscilla Fairfield Bok main-belt(middle) 4 September 2017 (JD 2458000.5) 0 66.73 yr (24,372 days) 2.8796 AU 2.3632 AU 2.6214 AU 0.0985 4.24 yr (1,550 days) 260.33° 0.2322 ms / day 9.4133° 23.557° 346.78° 10.08 km (calculated)15 3 km15.70 0.24 km 10.70 0.01 h 0.034 0.0150.06 0.020.10 (assumed) CS/C 12.83 0.1013.113.10 0.2213.32 1983 Bok (prov. designation: 1975 LB) is a dark background asteroid from the central region of the asteroid belt. It was discovered on 9 June 1975, by American astronomer Elizabeth Roemer at the Catalina Station of the UA's Steward Observatory in Tucson, Arizona, and named for Bart Bok and Priscilla Fairfield Bok. The carbonaceous C-type asteroid has a rotation period of 10.7 hours and measures approximately 15 km mi off 2 us in diameter. Classification and orbit Bok orbits the Sun in the central main-belt at a distance of 2.4–2.9 AU once every 4 years and 3 months (1,550 days). Its orbit has an eccentricity of 0.10 and an inclination of 9° with respect to the ecliptic. The first observation was taken at the Argentinian La Plata Astronomical Observatory in 1950, extending the asteroid's observation arc by 25 years prior to its discovery. Naming This minor planet was named after the astronomer couple Bart Bok (1906–1983) and Priscilla Fairfield Bok (1896–1975), in recognition for their contribution to astrometry of small Solar System bodies. Both astronomers studied the structure of the southern Milky Way and fostered astronomy in the Southern Hemisphere. Bok was the first numbered discovery made with the Stewart Observatory's 90-inch Bok Telescope. The body's name was proposed by the discovering astronomer and by Alan C. Gilmore from New Zealand. The official 1983 naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4158). Physical characteristics Bok has been characterized as a C-type asteroid. In October 2014, the first rotational lightcurve for this body was obtained by Italian astronomer Giovanni Battitsa Casalnuovo at the Eurac Observatory (C62) in Bolzano, Italy. Lightcurve analysis gave a well-defined rotation period of 10.70 0.01 hours with a relatively high brightness variation of 0.46 magnitude (U=3-). The Italian astronomer also calculated an albedo of 0.06 for its surface and a diameter of 15 3 kilometers, in agreement with the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer which gave a diameter of 15.7 kilometers and an albedo of 0.034. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10, a compromise value between the stony (0.20) and carbonaceous (0.057) asteroids with a semi-major axis between 2.6 and 2.7 AU, and consequently calculates a much smaller diameter of 10.08 kilometers using an absolute magnitude of 13.1. References 30em 2017-06-05 last obs. JPL Small-Body Database Browser: 1983 Bok (1975 LB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001983 Jet Propulsion Laboratory 1 July 2017 Dictionary of Minor Planet Names Schmadel Lutz D. Springer Berlin Heidelberg (1983) Bok 160 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1984 1983 Bok (1975 LB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1983 25 October 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 1983 25 October 2016 Casalnuovo Giovanni Battitsa April 2015 Lightcurve Analysis for Seven Main-belt Asteroids Minor Planet Bulletin http://www.minorplanet.info/MPB/issues/MPB_42-2.pdf 42 2 139–141 2015MPBu...42..139C 1052-8091 17 March 2020 21 February 2020 https://web.archive.org/web/20200221210256/http://www.minorplanet.info/MPB/issues/MPB_42-2.pdf dead 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 25 October 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 25 October 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 1983 1982 Cline 1983 1984 Fedynskij 001983 Category:Discoveries by Elizabeth Roemer Category:Named minor planets 19750609