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Astronomy Picture of the Day——木星附近的卫星们

 NASA航天爱好者 2021-04-12

Moons Near Jupiter

Image Credit & Copyright: Betul Turksoy

Explanation: On May 20, a nearly Full Moonand Jupiter shared this telephoto field of view. Captured when a passing cloudbank dimmed the moonlight, the single exposure reveals the familiar face of ourfair planet's own large natural satellite, along with bright Jupiter (lowerright) and some of its Galilean moons. Lined up left to right the tiny pinpricksof light near Jupiter are Ganymede, Europa, [Jupiter] and Callisto. (That's notjust dust on your screen ...) Closer and brighter, our own natural satelliteappears to loom large. But Ganymede, and Callisto are physically larger thanEarth's Moon, while water world Europa is only slightly smaller. In fact, ofthe Solar System's six largest planetary satellites, Saturn's moon Titan ismissing from the scene and a fourth Galilean moon, Io, is hidden by our rulinggas giant.

木星附近的卫星们

520日,一轮近乎圆满的满月和木星贡献了这幅望远镜视野下的美景。这幅单张曝光影像拍摄于一片浮云遮挡月光之时,它呈现出我们熟悉的天然卫星(月球)的面孔,以及明亮的木星(右下方)和它的伽利略卫星们(注)。从左到右排列在木星附近的小亮点依次是木卫三(盖尼米德)、木卫二(欧罗巴)、木星和木卫四(卡里斯托)(别擦了,那些不是你屏幕上的灰尘...)。我们地球的卫星离得更近,更加明亮,因此显得更为庞大。但是实际上,木卫三和木卫四的体积比月球还要大,而充满水的世界木卫二比月球只是稍小一点。实际上,在太阳系最大六颗卫星中,除了上文提到的四颗,土星的卫星土卫六在并没有出现在这幅画面中,而排行第四的木卫一则被庞大的气态巨星所遮挡。

注:

伽利略卫星,木星的四个大型卫星,由伽利略于1610年1月7日首度发现。

参考文献:

https://apod./apod/image/1905/DSC_9154TurksoyMay21MJ2048.jpg

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