Editing Jewel Box (star cluster) (section)

{{Short description|Open cluster in the constellation Crux}}
{{About|article is about the star cluster||Jewel box (disambiguation){{!}}Jewel box}}

{{Infobox open cluster|
| name = Jewel Box
| image = [[Image:A Snapshot of the Jewel Box cluster with the ESO VLT.jpg|300px]]
| caption = NGC 4755 taken by the [[:Very Large Telescope|VLT]]
| credit = [[ESO]]
| epoch = [[J2000]]
| class =
| ra = {{RA|12|53|42}}<ref name=simbad>
{{cite simbad
  | title=NGC 4755
  | access-date=2006-12-14
}}
</ref>
| dec = {{DEC|-60|22.0}}<ref name=simbad/>
| dist_ly = 6.50 [[light year|kly]]<ref name=simbad/>
| dist_pc = 1.99 [[parsec|kpc]]<ref name=simbad/>
| appmag_v =
| size_v =
| mass_kg =
| mass_msol = –
| radius_ly = –
| v_hb = –
| age = 16 Myr<ref name=kaltcheva/>
| constellation = [[Crux]]
| notes = –
| names = Herschel's Jewel Box,<ref name=simbad/> [[Kappa|κ]]&nbsp;Crucis cluster,<ref name=simbad/> [[New General Catalogue|NGC]]&nbsp;4755,<ref name=simbad/> [[Collinder catalogue|Cr]]&nbsp;264, [[Caldwell catalogue|Caldwell]]&nbsp;94<ref name=DOBdb>
{{cite web
 |title=Results for NGC&nbsp;4755
 |website=Deep sky observer companion database (docdb.net)
 |url=http://www.docdb.net/show_object.php?id=ngc_4755
 |access-date=2013-06-08 }}
</ref>
}}

The '''Jewel Box''' (also known as the Kappa Crucis cluster, NGC&nbsp;4755, or Caldwell&nbsp;94) is an [[open cluster]] in the [[constellation]] [[Crux]], originally discovered by [[Nicolas Louis de Lacaille]] in 1751–1752.<ref name=Jones_1969>
{{cite journal
 | last=Jones | first=K.G.
 | date=March 1969
 | title=The search for the nebulae - VI
 | journal=[[Journal of the British Astronomical Association]]
 | volume=79 | pages=213–222
 | bibcode=1969JBAA...79..213J
}}
</ref> This cluster was later named the Jewel Box by [[John Herschel]] when he described its telescopic appearance as "...&nbsp;a superb piece of fancy jewellery". It is easily visible to the naked eye as a hazy star some 1.0°&nbsp;southeast of the first-magnitude star [[Mimosa (star)|Mimosa]] (Beta Crucis). This hazy star was given the [[Bayer designation|Bayer star designation]] "Kappa Crucis", from which the cluster takes one of its common names. The modern designation [[Kappa Crucis (star)|Kappa Crucis]] has been assigned to one of the stars in the base of the A-shaped [[Asterism (astronomy)|asterism]] of the cluster.

This cluster is one of the youngest known, with an estimated age of 14&nbsp;million years. It has a total integrated [[magnitude (astronomy)|magnitude]]&nbsp;4.2, is located 1.99&nbsp;[[parsecs|kpc]], or 6497&nbsp;[[light year]]s from Earth,<ref name=simbad/> and contains just over 100&nbsp;stars.