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1535 Päijänne : ウィキペディア英語版 | 1535 Päijänne
1535 Päijänne, provisional designation 1939 RC, is a stony asteroid from the outer region of the asteroid belt, about 27 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at the Turku Observatory in the southwestern parts of Finland, on 9 September 1939.〔 The S-type asteroid orbits the Sun at a distance of 2.6–3.8 AU once every 5 years and 8 months (2,060 days). Its orbit shows an eccentricity of 0.19 and is tilted by 6 degrees to the plane of the ecliptic. It has a rotation period of 8.8 hours, observed by French astronomer Laurent Bernasconi.〔 The body's albedo has been identified to be 0.13–0.14, according to observations made by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission.〔〔〔 The asteroid was named after Finland's second largest lake, Päijänne, located in south-central Finland, and more than a thousand square kilometers in size.〔 == References ==
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