Editing Butterfly Cluster (section)

==References==
{{reflist|refs=

<ref name=trig>From [[trigonometry]]: radius = distance × sin( diameter_angle / 2 ) = 1,590 × sin( 25′/2 ) = 6 ly.</ref>

<ref name=simbad>{{cite simbad | title=NGC 6405 | access-date=2018-12-08 }}</ref>

<ref name=Frommert2007>{{citation
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 | date=August 21, 2007
 | url=http://www.messier.seds.org/m/m006.html
 | access-date=2018-12-07 | postscript=. }}</ref>

<ref name=Eggen1973>{{citation
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<ref name=Adam2018>{{citation
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<ref name=Burnham1705>{{citation
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 | url=https://books.google.com/books?id=tBQoCSRdLAAC&pg=PA1705 }}</ref>

<ref name=Netopil2016>{{citation
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<ref name=Wu2009>{{Citation | display-authors=1
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 | last3=Ma | first3=Jun | last4=Du | first4=Cui-Hua
 | title=The orbits of open clusters in the Galaxy
 | journal=[[Monthly Notices of the Royal Astronomical Society]]
 | volume=399 | issue=4 | pages=2146–2164 | date=November 2009
 | arxiv=0909.3737 | bibcode=2009MNRAS.399.2146W
 | doi=10.1111/j.1365-2966.2009.15416.x | doi-access=free | s2cid=6066790 | postscript=. }}</ref>

<ref name=Paunzen2006>{{citation
 | title=CCD photometric search for peculiar stars in open clusters. VII. Berkeley 11, Berkeley 94, Haffner 15, Lyngå 1, NGC 6031, NGC 6405, NGC 6834 and Ruprecht 130
 | last1=Paunzen | first1=E. | last2=Netopil | first2=M.
 | last3=Iliev | first3=I. Kh. | last4=Maitzen | first4=H. M.
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 | bibcode=2006A&A...454..171P | arxiv=astro-ph/0602567 | s2cid=5131254 }}</ref>

<ref name=Kılıçoğlu2016>{{citation
 | title=Chemical Composition of Intermediate-mass Star Members of the M6 (NGC 6405) Open Cluster
 | last1=Kılıçoğlu | first1=T. | last2=Monier | first2=R.
 | last3=Richer | first3=J. | last4=Fossati | first4=L.
 | last5=Albayrak | first5=B. | display-authors=1
 | journal=The Astronomical Journal
 | volume=151 | issue=3 | id=49 | pages=30 | date=March 2016
 | doi=10.3847/0004-6256/151/3/49 | postscript=.
 | bibcode=2016AJ....151...49K | arxiv=1510.05385 | s2cid=118553511 | doi-access=free }}</ref>

}}