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1573 Väisälä
1573 Väisälä, provisional designation 1949 UA, is a stony asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid belt, about 10 kilometers in diameter. It was discovered by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, on 27 October 1949.〔
The S-type asteroid is a member of the Phocaea family. It orbits the Sun at a distance of 1.8–2.9 AU once every 3 years and 8 months (1,333 days). Its orbit shows an eccentricity of 0.23 and is tilted by 25 degrees to the plane of the ecliptic. The asteroid has a notably long rotation period of 252 hours and seems to be in a non-principal axis rotation (NPAR), colloquially called as "tumbling". The results, however, are provisional, as no follow-up observations have been made. The body's albedo amounts to 0.22 and 0.28, according to the ''Supplemental IRAS Minor Planet Survey'' (SIMPS) and the Wide-field Infrared Survey Explorer (WISE), respectively.〔〔
The minor planet was named after prolific Finnish astronomer, Yrjö Väisälä (1891–1971), who discovered 128 asteroids, mostly in the late 1930s and early 1940s.〔 In addition, a second minor planet, 2804 Yrjö, was named in his honor by pioneering Finnish female astronomer Liisi Oterma, and the lunar crater ''Väisälä'' also bears his name.
== References ==
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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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