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1536 Pielinen : ウィキペディア英語版 | 1536 Pielinen
1536 Pielinen, provisional designation 1939 SE, is a stony asteroid from the inner regions of the asteroid belt, about 8 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory, Southwest Finland, on 18 September 1939.〔 The asteroid is a member of the Flora family, a large group of stony S-type asteroids in the inner main-belt. It orbits the Sun at a distance of 1.8–2.6 AU once every 3 years and 3 months (1,195 days). Its orbit shows an eccentricity of 0.19 and is tilted by 2 degrees to the plane of the ecliptic. Its relatively long rotation period of 66 to 67 hours has been measured several times.〔 Based on the survey carried out by the WISE/NEOWISE mission, it has an albedo of 0.26.〔 The Collaborative Asteroid Lightcurve Link (CALL) assumes a similar value of 0.24.〔 The minor planet is named after Pielinen, Finland's fourth largest lake in Finnish Karelia. The Koli National Park is located on its western shores.〔 == References ==
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