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2204 Lyyli, provisional designation 1943 EQ, is a dark asteroid and very eccentric Mars-crosser from the inner regions of the asteroid belt, about 25 kilometers in diameter. It was discovered on 3 March 1943 by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.〔 The X-type asteroid orbits the Sun at a distance of 1.5–3.6 AU once every 4 years and 2 months (1,521 days). Its orbit shows an outstanding eccentricity of 0.41, which is also notably tilted by 21 degrees to the plane of the ecliptic. It has a rotation period of 11 hours〔 and a very low albedo between 0.02 and 0.05, according to the surveys carried out by IRAS, Akari, and WISE/NEOWISE.〔〔〔 Other large Mars crossing minor planets include 132 Aethra and 323 Brucia, with diameters of 43 and 36 kilometers, respectively. The asteroid was named in honour of Lyyli Heinänen (1903–1988), nee Hartonen, a Finnish female Esperantist, professor of mathematics, amateur astronomer and former assistant of the discoverer.〔 == References == }} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「2204 Lyyli」の詳細全文を読む スポンサード リンク
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