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1663 van den Bos
1663 van den Bos, provisional designation 1926 PE, is a stony asteroid and an exceptionally slow rotator from the inner regions of the asteroid belt, about 12 kilometers in diameter. It was discovered on 4 August 1926 by English astronomer Harry Edwin Wood at Union Observatory in Johannesburg, South Africa.〔
The asteroid is a member of the Flora family, a large group of stony asteroids in the main-belt. It orbits the Sun at a distance of 1.8–2.6 AU once every 3 years and 4 months (1,225 days). Its orbit shows an eccentricity of 0.18 and is tilted by 5 degrees to the plane of the ecliptic. Repeated photometric light-curve observations in 2010, unveiled an outstandingly long rotation period of 740 hours for the asteroid.〔〔 An alternative period of hours has also been measured in the same year.〔 A geometric albedo of about 0.16 was measured for the S-type asteroid by the Akari and WISE/NEOWISE mission.〔〔〔
It was named in honor of Dutch-born, South African astronomer Willem Hendrik van den Bos (1896–1974), former director of the Union Observatory (1941–1956) and president of the ''Astronomical Society of South Africa'' (1943–1955). He made visual micrometric observations and discovered thousands of double stars.〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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