Editing Jewel Box (star cluster) (section)

==Observation==

The Jewel Box cluster is regarded as one of the finest objects in the southern sky.<ref name=Kaler>
{{cite book
 | last = Kaler | first = James B.
 | year = 1989
 | title = Stars and Their Spectra: An introduction to the spectral sequence
 | publisher = Cambridge University Press
 | place = Cambridge, UK
 | isbn = 978-0-521-58570-5
 | page = 13
 | url = https://books.google.com/books?id=ycLg34SaJWwC&pg=PA13
 | via = Google books
}}
</ref>
It is visible to the naked eye as a hazy object of the fourth magnitude.<ref name=RidpathTirion>
{{cite book
 | last1 = Ridpath |first1 = Ian  | author1-link = Ian Ridpath
 | last2 = Tirion  |first2 = Wil
 | year = 2007
 | title = Stars and Planets
 | publisher = Princeton University Press
 | isbn = 978-0-691-13556-4
 | page = 134
 | url = https://books.google.com/books?id=-pfuAAAAMAAJ
 | via = Google books
}}
</ref>
It can be easily located using the star [[Beta Crucis]] as a guide, and appears as a fourth magnitude object.<ref name=Mobberley>
{{cite book
 | last = Mobberley  | first = Martin
 | year = 2009
 | title = The Caldwell Objects
 | series = Astronomers' Observing Guides
 | publisher = Springer
 | doi = 10.1007/978-1-4419-0326-6
 | isbn = 978-1-4419-0325-9
 | page = 196
 | url = https://books.google.com/books?id=amPrWoOWgHcC
 | via = Google books
}}
</ref>
It is impressive when viewed with binoculars or a small or large telescope. Three members along the crossbar of the A-shaped asterism lie in a straight line known as the 'traffic lights' due to their varying colours.<ref name=Inglis>
{{cite book
 | last = Inglis  | first = Mike
 | year = 2004
 | title = Astronomy of the Milky Way: The observer's guide to the southern Milky Way
 | publisher = Springer
 | isbn = 978-1-85233-709-4
 | pages = 78–79
 | url = https://books.google.com/books?id=1r0qvMjSCGAC&pg=SA3-PA7
 | via = Google books
}}
</ref>