Editing Jewel Box (star cluster) (section)

==Discovery and observation==

The Jewel Box as a star cluster was first found by [[Nicolas Louis de Lacaille]] while doing astrometric observations for his 1751–1752 southern star catalogue ''[[Cœlum Australe Stelliferum]]'' at the [[Cape of Good Hope]] in [[South Africa]]. He saw this as a nebulous cluster in his small 12&nbsp;mm {{nobr|({{small|{{sfrac| 1 | 2 }}}} inch)}} telescope, but was first to recognise it as a group of many stars.<ref name=DOCdb>{{cite web |title=Jewel Box (NGC&nbsp;4755) |website=Deep sky observer companion database (docdb.net) |url=http://www.docdb.net/show_object.php?id=ngc_4755 }}</ref><ref name=southastrodel04>
{{cite web
 |last1=James |first1=Andrew
 |date=22 April 2016
 |title=Part one: 1752–1834
 |department=History of the Jewel Box
 |website=Southern astronomical delights (southastrodel.com)
 |url=http://www.southastrodel.com/Page004.htm
 |access-date=2016-04-22
}}
</ref>
The name "Jewel Box" comes from [[John Herschel]]'s own description of it:
: "...&nbsp;this cluster, though neither a large nor a rich one, is yet an extremely brilliant and beautiful object when viewed through an instrument of sufficient aperture to show distinctly the very different colour of its constituent stars, which give it the effect of a superb piece of fancy jewellery."<ref name=DOCdb/>

Herschel recorded the positions of just over 100&nbsp;members of the cluster in 1834–1838.<ref name=Thackeray>
{{cite journal
 | last = Thackeray  | first = A.D.
 | year = 1949
 | title = The Kappa Crucis Cluster
 | journal = Monthly Notes of the Astronomical Society of South Africa
 | volume = 8 | page = 30
 | bibcode = 1949MNSSA...8...30T
}}
</ref>