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口径10米的凯克望远镜已经在夏维夷的莫纳克亚投入运行,那里的星像直径可以小到0."3,请你估算一下用凯克望远镜进行目视观测的极限星等?Recently the Ten-meter Keck telescope began to operate on Mauna Kea (Hawaii),where the diameter of stellar images may be as small as 0".3. Can you evaluate the limiting stellar magnitude for visual observation with this telescope
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上一篇:太阳的视差为πs = 8". 8 ,具有相同绝对星等的另一颗恒星的视差为π* = 0" .022 ,在晚上能否用肉眼看到这颗星?The sun has a parallax of πs = 8 " .8 , and a star with the same absolute brightness π* =0 " .022 . Is it possible to observe the star at night sky visually
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