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NGC 6231

NGC 6231 is an open cluster in the southern sky located half a degrees north of Zeta Scorpii. NGC 6231 is part of a swath of young, bluish stars in the constellation Scorpius known as the Scorpius OB1 association. The star Zeta1 is a member of this association, while its brighter apparent partner, Zeta2, is only 150 ly from Earth and so is not a member.

Discovery
The cluster was discovered by Giovanni Batista Hodierna before 1654. Hodierna listed it as Luminosae in his catalogue of deep sky observations. This catalogue was included in his book De Admirandis Coeli Characteribuse published in 1654 at Palermo. It was independently observed by other astronomers after Hodierna, including Edmond Halley (1678), Jean-Philippe de Cheseaux (1745–46), and Abbe Lacaille (1751–52). == Common names ==
Common names
The cluster forms the head of the False Comet, a wider collection of stars from Scorpius OB1 running northward from Zeta Scorpii and NGC 6231 roughly halfway toward Mu Scorpii. The tail is formed by two clusters, Collinder 316 and Trumpler 24. Trumpler 24 is surrounded by the emission nebula IC 4628, also known as the Prawn Nebula, where the tail appears to fan out. The cluster is also sometimes known as The Northern Jewel Box, due to its similar appearance to the NGC 4755, the Jewel Box cluster, which is further south in the sky. == Chinese astronomy ==
Chinese astronomy
In Chinese astronomy, NGC 6231 is usually identified as Shengong (), a dressing room. ==Gallery==
Gallery
File:NGC6231map.png|Map showing the location of NGC 6231 File:NGC6231 Chandra.jpg|X-ray image from the Chandra X-ray Observatory File:Caldwell 76 (50291873217).jpg|Close-up view from the Hubble Space Telescope ==Notes==
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