11409 Horkheimer

Themistian asteroid May 2018 yes 11409 Horkheimer #D6D6D6 LONEOS Anderson Mesa Stn. 19 March 1999 (11409) Horkheimer 1999 FD 91988 HY1990 RH 15 Jack Horkheimer(American science communicator) main-belt(outer)Themis 23 March 2018 (JD 2458200.5) 0 29.11 yr (10,632 d) 3.5587 AU 2.8167 AU 3.1877 AU 0.1164 5.69 yr (2,079 d) 109.84° 0.1732 ms / day 2.2984° 115.92° 74.973° 15.355 0.100 km 0.053 0.005 C (Themis family) 12.8 11409 Horkheimer, provisional designation 1999 FD 9, is a Themistian asteroid from the outer regions of the asteroid belt, approximately 15 km mi off 2 us in diameter. It was discovered on 19 March 1999, by astronomers of the Lowell Observatory Near-Earth Object Search at Anderson Mesa Station near Flagstaff, Arizona. The likely C-type asteroid was named for American science communicator Jack Horkheimer. Orbit and classification Horkheimer is a core member of the Themis family (602), a very large family of carbonaceous asteroids, named after 24 Themis. It orbits the Sun in the outer asteroid belt at a distance of 2.8–3.6 AU once every 5 years and 8 months (2,079 days; semi-major axis of 3.19 AU). Its orbit has an eccentricity of 0.12 and an inclination of 2° with respect to the ecliptic. The body's observation arc begins with its first observation as 1988 HY at the Leoncito Astronomical Complex in April 1988, or 11 years prior to its official discovery observation at Anderson Mesa. Physical characteristics Horkheimer has an absolute magnitude of 12.8. While its spectral type has not been determined, it is likely a carbonaceous C-type asteroid, typical for members of the Themis family.23 As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Horkheimer measures 15.355 kilometers in diameter and its surface has an albedo of 0.053, typical for carbonaceous asteroids. Naming This minor planet was named after Jack F. Horkheimer (1938–2010), director of the Planetarium at the former Miami Science Museum, who was the creator and host of the television program Jack Horkheimer: Star Gazer. The official naming citation was published by the Minor Planet Center on 9 January 2001 (M.P.C. 41938). References 30em 2017-06-02 last obs. JPL Small-Body Database Browser: 11409 Horkheimer (1999 FD9) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011409 Jet Propulsion Laboratory 28 May 2018 11409 Horkheimer (1999 FD9) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=11409 28 May 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 28 May 2018 Asteroid 11409 Horkheimer Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=11409+Horkheimer 28 May 2018 https://web.archive.org/web/20180529053833/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=11409+Horkheimer 29 May 2018 dead 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 9780816532131 119280014 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 The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 118745497 External links Congress Congressional Record, Volume 154, Part 8, May 22, 2008 to June 6, 2008 https://books.google.com/books?id=vWBxXUEZ13EC&pg=PA885 2011 Government Printing Office 885 9780160889400 Dictionary of Minor Planet Names, Google books Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center 11409 11408 Zahradník 11409 011409 011409 Category:Named minor planets 19990319