NASA 04月08日 12:08
Moon Visits Sister Stars
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每日一天文图(APOD)展示了宇宙的奇观。2025年4月8日的天文图片聚焦了月亮与昴星团的罕见同框。这张由Cayetana Saiz在西班牙坎塔布里亚拍摄的图片,通过数字合成,将昴星团标志性的蓝色光芒呈现出来。月球的轨道偶尔会穿过昴星团,发生天文学上称为“掩星”的现象。由于月球轨道的倾斜和进动,这种掩星事件在2023年至2029年间每月都会发生,而下一次观测机会要等到2042年。

⭐月掩星现象:月球的轨道有时会穿过昴星团,发生天文学上称为“掩星”的现象。这意味着月球会直接运行到这个著名星团的前面,给观测者带来独特的视觉体验。

📅掩星周期:由于月球轨道的倾斜和进动,月亮掩星昴星团的事件并非连续发生。目前的掩星周期始于2023年,将持续到2029年,此后直到2042年才会再次发生。

📸拍摄细节:这张图片由Cayetana Saiz于4月1日在西班牙坎塔布里亚拍摄。为了增强昴星团的视觉效果,使用了数字合成技术,将之前在相同相机和位置拍摄的昴星团曝光图像叠加到最后一张图像上,从而突出了星团标志性的蓝色光芒。

Astronomy Picture of the Day

Discover the cosmos!Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2025 April 8

Moon Visits Sister Stars
Image Credit: Cayetana Saiz

Explanation: Sometimes, the Moon visits the Pleiades.Technically, this means that the orbit of our Moon takes it directly in front of the famous Pleiades star cluster, which is far in the distance. The technical term for the event is an occultation, and the Moon is famous for its rare occultations of all planets and several well-known bright stars.The Moon's tilted and precessing orbit makes its occultations of the Seven Sisters star cluster bunchy, with the current epoch starting in 2023 continuing monthly until 2029.After that, though, the next occultation won't occur until 2042. Taken from Cantabria, Spain on April 1, the featured image is a composite where previous exposures of the Pleiades from the same camera and location were digitally added to the last image to bring up the star cluster's iconic blue glow.

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月亮 昴星团 掩星 天文摄影
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