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2100 Ra-Shalom : ウィキペディア英語版 | 2100 Ra-Shalom The asteroid 2100 Ra-Shalom was discovered in 1978 by Eleanor F. Helin. It was the second asteroid in the Aten class, after the discovery of 2062 Aten in 1976, also by Helin. The Atens have a semi-major axis of less than 1 AU; of the Atens, Ra-Shalom is one of the asteroids with the smallest semi-major axes: just 0.832 AU. It comes within 30 Gm of Mars, Earth, Venus, and Mercury. The closest approaches are to Mercury, to about 0.0784 AU (11.7 Gm).〔 In 1981, this object was detected using radar, revealing a relatively smooth surface at decimeter scales.〔 The name of the asteroid, which refers to the Egyptian god Ra and the Hebrew word Shalom, refers to the Camp David Peace Accords between Egypt and Israel. ==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「2100 Ra-Shalom」の詳細全文を読む
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