1661 Granule

Asteroid October 2019 yes 1661 Granule #D6D6D6 31 March 1916 M. Wolf Heidelberg Obs. (1661) Granule A916 FA1936 PM1949 QG 11949 SJ1961 DB Edward Gall (pathologist) main-beltFlora 4 September 2017 (JD 2458000.5) 0 101.07 yr (36,915 days) 2.3818 AU 1.9857 AU 2.1838 AU 0.0907 3.23 yr (1,179 days) 121.10° 0.3054 ms / day 3.0353° 261.69° 328.08° 7.14 km (calculated) 24 h 0.24 (assumed) S 12.912.99 0.22 1661 Granule, also designated A916 FA, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 31 March 1916, by German astronomer Max Wolf at Heidelberg Observatiry in southern Germany, and named for American pathologist Edward Gall. Classification and orbit The S-type asteroid is a member of the Flora family, a large collisional population of stony asteroids in the inner main-belt. It orbits the Sun at a distance of 2.0–2.4 AU once every 3 years and 3 months (1,179 days). Its orbit has an eccentricity of 0.09 and an inclination of 3° with respect to the ecliptic. Granules observation arc begins with its observation at Bergedorf Observatory, one month after its official discovery observation. (It is unclear whether "HD 17", Message from Heidelberg Observatory #17, is the official discovery observation due to a different time stamp). Physical characteristics Rotation period In January 2006, the first rotational light-curve of Granule was obtained from photometric observations by French amateur astronomer René Roy. It gave a longer-than average rotation period of 24 hours with a brightness variation of 0.15 magnitude (U=2). No other light-curves have been obtained yet. Size estimates Granule has neither been observed by the Infrared Astronomical Satellite IRAS, nor the Japanese Akari satellite, nor NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from the family's principal body and namesake, the asteroid 8 Flora – and calculates a diameter of 7.14 kilometers using an absolute magnitude of 12.9. Naming This minor planet was named in honor of Edward A. Gall, an internationally renowned American pathologist, former director of the University of Cincinnati Academic Health Center and president of USCAP. It was named on the occasion of his retirement to commemorate his career and his discovery of the Gall's granule, a feature of lymphocytes. The official 1661 naming citation was published by the Minor Planet Center on 20 December 1974 (M.P.C. 3757). References 30em 2017-04-26 last obs. JPL Small-Body Database Browser: 1661 Granule (A916 FA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001661 Jet Propulsion Laboratory 6 June 2017 Dictionary of Minor Planet Names – (1661) Granule Schmadel Lutz D. Springer Berlin Heidelberg 132 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1662 (1661) Granule 1661 Granule (A916 FA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1661 23 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 Asteroids and comets rotation curves – (1661) Granule Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001661 23 December 2016 1 April 2019 https://web.archive.org/web/20190401181659/http://obswww.unige.ch/~behrend/page4cou.html#001661 dead Past-Presidents – Edward A. Gall http://www.uscap.org/about/history/past-presidents/edward-a-gall USCAP – The United States and Canadian Academy of Pathology 23 December 2016 https://web.archive.org/web/20161224094151/http://www.uscap.org/about/history/past-presidents/edward-a-gall 24 December 2016 dead 1661 23 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 23 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/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1661 1660 Wood 1661 1662 Hoffmann 001661 Category:Discoveries by Max Wolf Category:Named minor planets 19160331