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[问答]
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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