9298 Geake

Geake has been identified as a member of the Mitidika family, a dispersed asteroid family of carbonaceous C-type asteroids. The family is named after 2262 Mitidika (diameter of 9 km) and consists of 653 known members, the largest ones being 404 Arsinoë (95 km) and 5079 Brubeck (17 km).{{rp|23}}{{efn|name=family-albedo}}

The asteroid orbits the Sun in the central main-belt at a distance of 1.8–3.3 AU once every 4 years and 2 months (1,507 days). Its orbit has an eccentricity of 0.30 and an inclination of 12° with respect to the ecliptic. It was first observed on a precovery taken at Palomar Observatory in May 1956, extending the body's observation arc by 29 years prior to its official discovery observation at Anderson Mesa.

In August 2006, a rotational lightcurve of Geake was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory ({{small|716}}) in Colorado. Lightcurve analysis gave a rotation period of 38.29 hours with a brightness variation of 0.78 magnitude ({{small|U=2}}).{{efn|name=lightcurve-plot}} While not being a slow rotator, it has a longer than average rotation, which lies normally between 2 and 20 hours. The body's high brightness amplitude of 0.78 magnitude also indicates that it has a non-spheroidal shape.

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Geake measures between 11.54 and 14.040 kilometers in diameter and its surface has a low albedo between 0.033 and 0.05.

Contrary to the results obtained by the space-based observatories, the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20, derived from the family's namesake,{{efn|name=family-albedo}} and consequently calculates a much shorter diameter of 6.50 kilometers based on an absolute magnitude of 13.3, as the higher a body's reflectivity the smaller its diameter for a given brightness.

This minor planet was named after British astronomer John E. Geake (1925–1998), who invented the direct-reading linear refractometer, which was used by the Cassini–Huygens space probe. The official naming citation was published by the Minor Planet Center on 26 July 2000 ({{small|M.P.C. 41029}}).

{{notelist|refs=

{{efn|name=lightcurve-plot|1=[http://www.minorplanetobserver.com/pdolc/A9298_2006.HTM Lightcurve plot of 9298 Geake] with a rotation period {{val|38.29|0.02}} hours with a brightness amplitude of {{val|0.78|0.03}} by B. D. Warner at the Palmer Divide Observatory (2006). Summary figures at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1889%7CPakhmutova LCDB]}}

{{efn|name=family-albedo|1=While the members of the Mitidika family have been characterized by Nesvorný (2014) as carbonaceous C-type asteroids with low albedos around 0.06, the family's namesake, 2262 Mitidika, is a much more reflective body with a measured [https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002262#phys_par albedo of 0.208], typically associated with stony S-type asteroids.}}

}}

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• [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
• [https://books.google.com/books?id=aeAg1X7afOoC Dictionary of Minor Planet Names], Google books
• [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
• [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center
• {{AstDys|9298}}
• {{JPL small body}}

{{Minor planets navigator |9297 Marchuk |number=9298 |9299 Vinceteri}}

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009298

Category:Discoveries by Edward L. G. Bowell

Category:Named minor planets

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