1635 Bohrmann

The stony S-type asteroid belongs to the Koronis family, a group consisting of few hundred known bodies with nearly ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.0 AU once every 4 years and 10 months (1,761 days). Its orbit has an eccentricity of 0.06 and an inclination of 2° with respect to the ecliptic.

As no precoveries were taken, Bohrmann{{'}}s observation arc begins with the first used observation taken on the night following its discovery.

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Bohrmann measures between 16.6 and 19.1 kilometers in diameter, and its surface has an albedo between 0.187 and 0.255. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Koronian family of 0.24, and calculates a diameter of 17.1 kilometers with an absolute magnitude of 11.0.

In September and October 2003, four rotational lightcurves were obtained for this asteroid from photometric observations at several observatories around the world, including the Whitin Observatory in Wellesley, Massachusetts, as well as by U.S. astronomers Robert Stephens and Brian Warner. The lightcurves gave two different solutions for the Bohrmann{{'}}s rotation period. One solution gave {{val|5.864|0.001}} and {{val|5.86427|0.00005}} hours, while the alternative solution gave {{val|11.73|0.01}} and {{val|11.730|0.005}} hours. The lightcurves had a concurring brightness variation of 0.25 in magnitude ({{small|U=2/2/3/n.a.}}).

This minor planet was named after German astronomer Alfred Bohrmann (1904–2000), a long-time observer of minor planets at the discovering Heidelberg Observatory and a discoverer of minor planets himself. During his career he had published several hundreds of precise observations of asteroids. The official {{MoMP|1635|naming citation}} was published by the Minor Planet Center on 20 February 1976 ({{small|M.P.C. 3931}}).

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• [http://www.minorplanetobserver.com/pdolc/A1635_2003.HTM Lightcurve plot of 1635 Bohrmann], Palmer Divide Observatory, B. D. Warner (2003)
• [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&pg 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/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
• {{AstDys|1635}}
• {{JPL small body}}

{{Minor planets navigator |1634 Ndola |number=1635 |1636 Porter}}

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001635

Category:Discoveries by Karl Wilhelm Reinmuth

Category:Named minor planets

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