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Jewel Box (star cluster)
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==Physical characteristics== The Jewel Box cluster is one of the youngest known [[open cluster]]s. The mean [[radial velocity]] of the Jewel Box cluster is {{convert|-21|km/s|mi/s}}.<ref name=kaltcheva> {{Cite journal |first1=N. |last1=Kaltcheva |first2=V. |last2=Golev |first3=K. |last3=Moran |year=2013 |title=Massive stellar content of the Galactic supershell GSH 305+01-24 |journal=[[Astronomy & Astrophysics]] |volume=562 |page=A69 |doi=10.1051/0004-6361/201321454 |arxiv=1312.5592 |s2cid=54222753 |bibcode = 2014A&A...562A..69K }} </ref> The brightest stars in the Jewel Box cluster are [[supergiant]]s, and include some of the brightest stars in the [[Milky Way galaxy]].<ref name=Burnham> {{cite book | last = Burnham | first = Robert | author-link = Robert Burnham Jr. | year = 1978 | title = Burnham's Celestial Handbook: An observers' guide to the universe beyond the Solar system | edition = reprint | location = New York, NY | publisher = [[Dover Publications]] | isbn = 978-0-486-23568-4 | page = 730 | url = https://books.google.com/books?id=wB9uZ9lH5bgC&pg=PA730 | via = Google books }} </ref> Calculating its distance is difficult due to the proximity of the [[Coalsack Nebula]], which [[extinction (astronomy)|obscures]] some of its light.<ref name=ConsolmagnoEtAl> {{cite book | first1 = Guy | last1 = Consolmagno | first2 = Dan | last2 = Davis | year = 2005 | title = Turn Left at Orion: A hundred night sky objects to see in a small telescope | publisher = Cambridge University Press | place = Cambridge, UK | isbn = 978-0-521-78190-9 | page = 189 | url = https://books.google.com/books?id=PexKTfPy3voC&pg=PA189 | via = Google books }} </ref>
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