This week’s naked-eye object is the Northern Jewel Box, also known as open cluster NGC 6231. At the southernmost reaches of Scorpius, a stellar comet shines brightly. The head of this asterism, known ...

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We have determined accurate MK types for 26 of the brightest stars in the field of NGC 6231. We found one emission-line star with a weak shell, one star with in strong (already known), four stars with ...