歐卡托撞擊坑
Multi tool use
歐卡托撞擊坑
曙光號太空船拍攝的歐卡托撞擊坑黑白影像。
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| 位置 |
穀神星
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| 座標 |
19°52′N 238°51′E / 19.86°N 238.85°E / 19.86; 238.85[1][2]坐标：19°52′N 238°51′E / 19.86°N 238.85°E / 19.86; 238.85[1][2]
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| 直徑 |
92公里（57英里） |
| 深度 |
4 km |
| 發現者 |
曙光號太空船團隊
2015 |
| 名稱 |
歐卡托，刻瑞斯的助手 |
歐卡托撞擊坑（Occator，）是一個位於矮行星穀神星表面的撞擊坑，其引人注目之處在於，它是“亮斑5”（黎明號所觀測到穀神星表面最亮的反照率特徵）的所在地點。在早期凱克天文台觀測影像中就已經發現到它的存在，並被標記為“A區”[3]。
該撞擊坑以羅馬神話中代表農具耖的神明，也是農業與穀物之神刻瑞斯的助手歐卡托命名[1][2]。
科學家於2015年7月宣布黎明號在亮斑上方發現了煙霧[4]，而且不止一次觀測到這種現象。這表明穀神星上某個地區可以維持氣體的存在，甚至可能是穀神星大氣的基礎。煙霧停留在亮斑附近，撞擊坑的大半個區域都被煙霧覆蓋，大大提升了亮斑由冰構成的可能性。這團煙霧極有可能是亮斑中的冰體昇華所形成，也提升了某種冰火山活動正在進行的推測。
但在12月9日，科學家宣稱穀神星表面，包括歐卡托撞擊坑中“亮斑5”的亮斑可能與某種鹽有關.。它們可能是包含了硫酸鎂的鹽滷；這些斑點也被發現與富含氨的粘土相關[5]。
影像
參見
參考資料
^ 1.01.1 Staff. Planetary Names: Crater, craters: Occator on Ceres. USGS. 6 July 2015 [16 July 2015].
^ 2.02.1 Staff. USGS: Ceres nomenclature (PDF). USGS. 13 July 2015 [16 July 2015].
^ Kupper; 等. PIA17831: Water Detection on Ceres. NASA. 22 January 2014 [30 July 2015].
^ [1]
^ Landau, Elizabeth. New Clues to Ceres' Bright Spots and Origins. NASA. 9 December 2015 [10 December 2015].
穀神星（矮行星）
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|---|
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| 分類 |
行星 · 矮行星 · 行星定義 · 2006年行星定義 · 小行星
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| 發現 |
朱塞普·皮亞齊 · 法蘭西斯·沃拉斯頓 · 邁耶 · 巴爾納伯·奧里亞尼 · 約翰·波得 · 傑羅姆·拉朗德 · 高斯 · 法蘭茲·克薩韋爾·馮·扎克 · 歐伯斯
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| 地質 |
歐卡托撞擊坑 · 阿胡拉山 · 穀神星的亮點
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| 探測 |
黎明號 |
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| 其它 |
科幻中的穀神星 · 殖民 · 星占 · 曾經被認為是行星的太陽系天體
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