自转的木星与旋绕的卫星

2022年10月25日

Jupiter Rotates as Moons Orbit
Video Credit & Copyright: Makrem Larnaout

Explanation: Jupiter and its moons move like our Sun and its planets. Similarly, Jupiter spins while its moons circle around. Jupiter’s rotation can be observed by tracking circulating dark belts and light zones. The Great Red Spot, the largest storm known, rotates to become visible after about 15 seconds in the 48-second time lapse video. The video is a compilation of shorts taken over several nights last month and combined into a digital recreation of how 24-continuous hours would appear. Jupiter’s brightest moons always orbit in the plane of the planet’s rotation, even as Earth’s spin makes the whole system appear to tilt. The moons Europa, Ganymede, and Io are all visible, with Europa’s shadow appearing as the icy Galilean moon crosses Jupiter’s disk. Jupiter remains near opposition this month, meaning that it is unusually bright, near to its closest to the Earth, and visible nearly all night long.

Almost Hyperspace: Random APOD Generator

Tomorrow’s picture: longer than a comet

自转的木星与旋绕的卫星
影片提供与版权: Makrem Larnaout

说明: 木星与其卫星的运动，酷似我们的太阳和它的行星。亦即，木星的卫星旋绕它之时，它也在自转。木星的自转可以透过追踪环绕的暗带和亮区来加以观察。在这部长48秒的缩时影片里，木星现知最大的风暴系统大红斑大约在15秒时旋入视野。这部影片是由摄于上个月数个晚上的短片经过数位衔接而成，以复制连续24小时所见的木星景观。虽然地球自转让整个木星系统看来是倾斜的，但木星最明亮的卫星，总是在行星的自转平面上运行。影片中可见的木星卫星有木卫二、木卫三和木卫一，而冰质伽利略卫星木卫二更曳着影子掠过木星的盘面。这个月的木星仍然位在冲附近，这意味着它离地球很近，异常的明亮，并且几乎彻夜可见。

几乎超空间: 随机APOD生成器

明日的图片: longer than a comet