Messier 23 is a large, bright, open cluster located in the constellation of Sagittarius 4.5 degrees northwest of Mu Sagittarii. It can be seen here at the bottom center of the frame. A complex of dark nebulae, the most distinctive of which is Barnard 84a, lies just to the north of M23. B84a is at the top of the frame with a 9.5 magnitude star in the middle of it. Just above M23 are LDN 288 and LDN 285.
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TOP22317060
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達志影像
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RM
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