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词条 掩星

描述: 掩星是指一个天体将另一个天体完全遮住。从地球上看,月球经常从恒星前面经过。我们称这些恒星被月球掩星。太阳系中的其他天体偶尔也会掩一些亮星。

掩星有助于研究遥远的柯伊伯带天体的大气层。当这些冰冻天体掩星时,来自恒星的光线会短暂穿过柯伊伯带天体的大气层。当这些光线到达地球时,就会带有柯伊伯带天体大气层的光谱特征。

若一个天体从另一个天体前方经过,但并没有完全遮挡住另一个天体,则我们称之为凌星。

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Saturn's moon Titan partially illuminated. Saturn's moon Rhea is partially obscured behind Titan's top left edge

Rhea reappearing after occultation by Titan

图注: On October 27, 2009, NASA’s Cassini spacecraft orbiting around Saturn captured this view of Saturn's moon Rhea as it began to emerge after being hidden by Saturn's largest moon Titan during an occultation. An occultation is a celestial event in which one object moves in front of another and temporarily blocks the first object from view. In this image, Titan — about 5,150 km across — was closer to the spacecraft at about 1 million km, while Rhea — roughly 1,528 km in diameter — was farther away at about 2.3 million km. Titan’s high-altitude atmospheric haze is visible as a faint glow around its limb, showing the difference in surface and atmospheric properties between these two moons. Scientists study occultations like this because watching how one moon disappears behind or reappears from another helps refine our understanding of their orbits and physical characteristics.
来源: NASA/JPL/Space Science Institute 来源链接

License: PD 公共领域 图标