JWST在通往L2的路上
(原标题: JWST on the Road to L2)
2021-12-31
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这张延时gif图记录了詹姆斯·韦伯太空望远镜穿越猎户座恒星，前往月球以外的目的地的旅程。拍摄于12月28日，连续12次曝光，每次10分钟，并与随后的背景恒星彩色图像相结合，创造了动画。在12月25日发射后大约2.5天，JWST从地球的重力脊上爬上月球轨道的高度，到达一个围绕L2的光环轨道，L2是地球-太阳拉格朗日点。拉格朗日点是空间中方便的位置，在这里，一个大质量物体（地球）绕另一个大质量物体（太阳）的联合引力与与它们一起运动所需的向心力保持平衡。所以更小的质量，比如宇宙飞船，倾向于停留在那里。作为5个拉格朗日点之一，L2距离地球约150万公里，直接沿着日地线。JWST将在发射29天后的1月23日到达L2。当你在地球表面的重力下放松时，你可以在线跟踪詹姆斯韦伯太空望远镜的进展和复杂的部署。
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This timelapse gif tracks the James Webb Space Telescope as it streaks across the stars of Orion on its journey to a destination beyond the Moon. Recorded on December 28, 12 consecutive exposures each 10 minutes long were aligned and combined with a subsequent color image of the background stars to create the animation. About 2.5 days after its December 25 launch, JWST cruised past the altitude of the Moon's orbit as it climbed up the gravity ridge from Earth to reach a halo orbit around L2, an Earth-Sun Lagrange point. Lagrange points are convenient locations in space where the combined gravitational attraction of one massive body (Earth) orbiting another massive body (Sun) is in balance with the centripetal force needed to move along with them. So much smaller masses, like spacecraft, will tend to stay there. One of 5 Lagrange points, L2 is about 1.5 million kilometers from Earth directly along the Earth-Sun line. JWST will arrive at L2 on January 23, 29 days after launch. While relaxing in Earth's surface gravity you can follow the James Webb Space Telescope's progress and complicated deployment online.
© Malcolm Park