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2090 Mizuho
2090 Mizuho, provisional designation 1978 EA, is a stony asteroid from the outer region of the asteroid belt, about 18 kilometers in diameter. It was discovered by Japanese astronomer Takeshi Urata at the JCPM Yakiimo Station in Shimizu, Japan on 12 March 1978.〔 The S-type asteroid orbits the Sun at a distance of 2.7–3.5 AU once every 5.41 years (1,974 days). Its orbit shows an eccentricity of 0.13 and is tilted by 12 degrees to the plane of the ecliptic. It takes about 5.47 hours to rotate around its axis.〔 The S-type asteroid has a geometric albedo of 0.21 as measured by the Akari and NEOWISE surveys.〔〔 The discoverer named the minor planet after his daughter, Mizuho Urata.〔 It was the first asteroid in over 50 years to be discovered by a non-professional astronomer, which set off a wave of interest in amateur asteroid discovery, especially in Japan.〔 == 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「2090 Mizuho」の詳細全文を読む
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