立体海琳
(原标题: Stereo Helene)
2024-06-01
浏览次数: 27
拿出你的红/蓝眼镜，漂浮在土星冰冷的小卫星Helene旁边。Helene是一颗特洛伊卫星，因为它在拉格朗日点绕轨道运行而得名。拉格朗日点是两个大质量天体附近引力稳定的位置，这里指的是土星和较大的卫星土卫四。事实上，形状不规则（大约36乘32乘30公里）的海卫一在土卫一的拉格朗日点上运行，而兄弟的冰卫星波吕杜斯紧随其后在土卫一的拉格朗日点上运行。这幅清晰的立体图像是由卡西尼号2011年近距离飞越时拍摄的两幅图像构成的。它展示了Helene面向土星的部分半球，上面布满了陨石坑和沟壑。
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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.