立體聲海倫
Stereo Helene

發表日期:2025-03-29
拿出你的紅藍眼鏡,漂浮在土星的冰冷小衛星海倫(Helene)旁邊。赫蓮娜是一顆特洛伊木馬衛星,因為它的軌道位於拉格朗日點,所以被稱為 "赫蓮娜"。拉格朗日點是兩個大質量天體附近的一個引力穩定位置,這裡指的是土星和較大的衛星狄奧尼。事實上,形狀不規則(約 36 x 32 x 30 千米)的海倫(Helene)就執行在迪奧涅的領先拉格朗日點上,而它的兄弟冰衛星波呂丟克斯(Polydeuces)則執行在迪奧涅的落後拉格朗日點上。這幅清晰的立體合成圖是由卡西尼號在 2011 年近距離飛越時拍攝的兩幅影像合成的。它顯示了赫勒內面向土星的半球的一部分,上面佈滿了隕石坑和溝壑。
原文:Get out your red/blue glasses and float next to Helene, small, icy moon of Saturn. Appropriately named, Helene is a Trojan moon, so called because it orbits at a Lagrange point. A Lagrange point is a gravitationally stable position near two massive bodies, in this case Saturn and larger moon Dione. In fact, irregularly shaped ( about 36 by 32 by 30 kilometers) Helene orbits at Dione's leading Lagrange point while brotherly ice moon Polydeuces follows at Dione's trailing Lagrange point. The sharp stereo anaglyph was constructed from two Cassini images captured during a close flyby in 2011. It shows part of the Saturn-facing hemisphere of Helene mottled with craters and gully-like features.
※ 本文由萌芽機器人自動轉貼自每日一天文圖(Astronomy Picture of the Day,APOD),原文為英文,正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理,內容僅供參考,若有任何錯誤之處還請見諒!
關於每日一天文圖:每日一天文圖網站是美國國家航空暨太空總署與密西根理工大學提供的服務,網站每天提供一張影像或圖片,並由天文學家撰寫扼要說明其特別之處。