穎神星(9 Metis,亦稱9號小行星,符號:)是小行星帶較大的小行星之一,由矽酸鹽、鎳和鐵組成,並且有可能是古代一顆巨大的小行星撞擊后的核心殘留物。
穎神星是由安德鲁·格雷厄姆於1848年4月25日發現,是他發現的唯一一顆小行星。它也是唯一一顆在愛爾蘭觀測發現的小行星。名稱的由來是神話中的提坦女神和海洋女神墨提斯,是忒提斯和俄刻阿诺斯的女兒。忒提斯(墨提斯之母)這個名稱也曾經被提議,但後來被否決了(名稱後來被用在海女星)。中文译名来源于清代李善兰翻译的《谈天》一书。
基於資料不明確,穎神星自轉方向至今仍不明。
光度曲線的分析顯示穎神星的自轉軸指向黃道座標 (β, λ) = (23°, 181°) 或 (9°, 359°),誤差在10°以內[4]。相對應的赤道座標是 (α, δ) = (12.7 h, 21°) 或 (23.7 h, 8°),對應的轉軸傾角則分別是72° 或 76°[來源請求]。
哈伯太空望遠鏡的影像[5][9] 和光度曲線的分析[4]也認同穎神星有不規則的形狀,一端是細長的而另一端是寬厚的[4][9]。雷達的觀測建議有一個較大的平坦區域[10]與從光度曲線獲得的模型是一致的。估計表面的成分是30%至40%含有金屬的橄欖石和60%至70%的鎳鐵金屬[11]。
穎神星的光度曲線資料也推導出他可能有衛星,但是後續的觀測尚無法證實這一點[12][13]。在1993年使用哈伯太空望遠鏡做的搜尋也沒有發現衛星[9]。
穎神星一度曾經被認為小行星族的穎神星族成員之一[14],但最近的調查認為这一族群並不存在,在本征轨道根数图中也看不出穎神星附近有星体叢集的迹象。
然而,光谱的分析發現穎神星和羊神星非常相似,因此建議這些小行星是非常古老(至少大約一億年)的動力學家族,更小的成員因為相互的撞擊而粉碎,或攝動而離開了鄰近的區域。推斷母天體的直徑大約在300公里至600公里之間(灶神星的尺寸),並且經歷過分化。穎神星可能是原封未動的核心殘骸,而羊神星是地函的碎片[11]。巧合的是,這兩顆小行星的名稱也被用在木星衛星的命名上。.
至少已經觀測過五次的穎神星掩星事件[15]。
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