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1757 Porvoo
1757 Porvoo, provisional designation 1939 FC, is a stony asteroid from the inner regions of the asteroid belt, about 10 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory on the southwestern coast of Finland, on 17 March 1939.〔
The asteroid orbits the Sun at a distance of 2.1–2.6 AU once every 3 years and 7 months (1,317 days). Its orbit shows an eccentricity of 0.13 and is tilted by 4 degrees to the plane of the ecliptic. It has a rotation period of 4.89 hours〔 and an albedo of 0.05–0.07 based on observations by the Japanese Akari and the Wide-field Infrared Survey Explorer satellites.〔〔 The Collaborative Asteroid Lightcurve Link (CALL) assumes the body to by an S-type asteroid, despite the fact that the derived, low albedos from the space-based satellite observations are that of a carbonaceous, rather than a silicaceous asteroid.〔
The minor planet was named after Porvoo, Finnish city and municipality located on the southern coast of Finland, and east of the capital Helsinki. Porvoo is one of the six medieval towns in Finland, and is its second oldest city after Turku, location of the discovering observatory. In 1809, at the Diet of Porvoo, the Russian czar confirmed that Finland was annexed to the Russian empire as an autonomous nation.〔
== 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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