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1313 Berna
1313 Berna, provisional designation 1933 QG, is a stony, binary asteroid from the middle region of the asteroid belt, about 14 kilometers in diameter. It was discovered by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, on 24 August 1933.〔
The asteroid is a member of the Eunomia family, a prominent group of stony S-type asteroids and the largest family in the intermediate main-belt. It orbits the Sun at a distance of 2.1–3.2 AU once every 4 years and 4 months (1,581 days). Its orbit shows a relatively high eccentricity of 0.21 and is notably tilted by 13 degrees to the plane of the ecliptic. It has a rotation period of 25.46 hours and an albedo between 0.17 and 0.25, according to the collected observations from the space-based satellites Akari, WISE, and Spitzer.〔〔〔〔
In 2004, a satellite orbiting the asteroid was discovered. The moon, designated S/2004 (1313) 1, measures about 11 kilometers in diameter and orbits ''Berna'' at a distance of 35 kilometer once every 25 hours and 28 minutes. Since the lightcurve is synchronized with the eclipse events, at least one body of the binary system rotates synchronously with the orbital motion. It was identified based on light-curve observations taken in February 2004 by several astronomers, including Raoul Behrend from the Geneva Observatory, Stefano Sposetti, R. Roy and others.〔 Although the IAUC was released on 23 February 2004, the announcement was already made on 12 February 2004. There are several hundreds of asteroids known to have satellites ''(also see )''.〔
The minor planet was named after the Swiss capital city of Bern. The name was proposed by Sigmund Mauderli (1876–1962), astronomer and director of the Astronomical Institute at the University of Bern, after whom 1748 Mauderli is named. He computed the definitive orbit of the body, and also insisted to rename the minor planet to its current name, after it had been originally published as "Bernia".〔
== 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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